HA-JDBC - HA-JDBC Changes

HA-JDBC Changes

Release History

Version	Date	Description
3.0.3	2014-07-25
3.0.2	2014-04-07
3.0.1	2014-04-03
3.0.0	2013-12-30
3.0.0-rc-1	2013-11-06
2.1.0-beta-4	2013-08-11
2.1.0-beta-3	2012-12-09
2.1.0-beta-2	2012-10-27
2.1.0-beta-1	2012-10-11
2.0.16	Pending
2.0.16-rc-1	2009-06-21
2.0.15	2009-02-17
2.0.14	2009-02-15
2.0.14-rc-1	2009-01-25
2.0.13	2008-05-20
2.0.12	2008-03-18
2.0.11	2008-01-14
2.0.10	2008-01-08
2.0.9	2007-12-28
2.0.8	2007-11-19
2.0.7	2007-11-09
2.0.6	2007-10-17
2.0.5	2007-10-15
2.0.4	2007-10-04
2.0.3	2007-09-24
2.0.2	2007-09-14
2.0.1	2007-07-23
2.0.0	2007-07-16
2.0-rc-4	2007-07-07
2.0-rc-3	2007-07-02
2.0-rc-2	2007-06-25
2.0-rc-1	2007-06-18
2.0-beta-1	2007-04-23
1.2-beta-7	2006-12-01
1.2-beta-6	2006-10-24
1.2-beta-5	2006-09-22
1.2-beta-4	2006-09-11
1.2-beta-3	2006-08-26
1.2-beta-2	2006-08-10
1.2-beta-1	2006-07-19
1.1	2006-04-21
1.1-rc-2	2006-04-18
1.1-rc-1	2006-04-09
1.1-beta-7	2006-03-20
1.1-beta-6	2006-02-15
1.1-beta-5	2006-02-13
1.1-beta-4	2006-02-10
1.1-beta-3	2006-01-27
1.1-beta-2	2006-01-23
1.1-beta-1	2005-12-13
1.0	2005-09-22
1.0-rc-5	2005-09-15
1.0-rc-4	2005-09-06
1.0-rc-3	2005-08-23
1.0-rc-2	2005-08-21
1.0-rc-1	2005-08-02
1.0-beta-8	2005-04-27
1.0-beta-7	2005-04-05
1.0-beta-6	2005-03-31
1.0-beta-5	2005-03-03
1.0-beta-4	2005-02-18
1.0-beta-3	2005-02-07
1.0-beta-2	2005-01-08
1.0-beta-1	2004-10-01
1.0-alpha-3	2004-08-30
1.0-alpha-2	2004-07-17
1.0-alpha-1	2004-07-14

Release 3.0.3 - 2014-07-25

Type	Changes	By
	Avoid use of PreparedStatement.addBatch(String) in SQLStateManager since not all dialects support it. Thanks to Justin Cranford.
	Add ability to override the default logical address of the JGroups channel.	pferraro
	Fix alter sequence SQL for Oracle dialect.	pferraro
	Fix NPE when previous coordinator is restarted. Refactor command dispatcher logic using channel that does not discard its own messages.	pferraro
	Fix MySQL restore process - replace file pipe with writing file directly to the process output.	pferraro
	Ensure ProcessBuilder.environment() uses privileged action.	pferraro
	Use INVOKE_ON_ANY strategy for Connection.getTransactionIsolation() - most drivers don't require a round trip to the database for this.	pferraro
	Fix bug in DistributedStateManager where our local state is never persisted during activation/deactivation.	pferraro
	Add support for data-only dump-restore.	pferraro
	Don't deactivate local databases on stop until we can distinguish between embedded databases and local databases using separate processes.	pferraro
	Ensure that we rollback any current transactions to release any locks before closing the connections to an inactive database. This is necessary if the connection is pooled.	pferraro
	Fix alter sequence SQL for Oracle dialect.	pferraro

Release 3.0.2 - 2014-04-07

Type	Changes	By
	Fix NoClassDefFoundError in SLF4J and Commons logging providers when the requisite classes are not available.	pferraro

Release 3.0.1 - 2014-04-03

Type	Changes	By
	Upgrade JGroups to 3.4.3.Final	pferraro
	Refactor DumpRestoreSupport to support dialects that do not require external process execution.	pferraro
	Ensure Database.setActive(...) is set correctly during startup.	pferraro
	Fixes issue where DataSource is created multiple times, which is very bad if the DataSource encapsulates a connection pool.	pferraro
	Fix table introspection in Oracle dialect to use user name as schema.	pferraro
	Fix failure detection logic in H2 and HSQLDB dialects.	pferraro
	Fix dump/restore in MySQL dialect to use -r option.	pferraro
	Improve resiliency of invocation strategies to concurrent database deactivation.	pferraro
	Distributable state manager needs to delegate to local state manager on activate/deactivate.	pferraro
	Fix issue where HA-JDBC proxies can retain stale references to objects from a deactivated database if that database is reactivated before being accessed.	pferraro

Release 3.0.0 - 2013-12-30

Type	Changes	By
	Update default jgroups configuration.	pferraro

Release 3.0.0-rc-1 - 2013-11-06

Type	Changes	By
	Re-versioned to 3.0. The scope of changes since 2.0.x justifies a major release bump.	pferraro
	Add option to drop PostgreSQL database object before restoring. Thanks to sjones4.
	Fix input channel registration. Thanks to sjones4.
	Fixed UnsupportedOperationException when using dump-restore sync strategy due to incorrect regex parsing of jdbc url.	pferraro
	Allow runtime change to weight for active databases. Thanks to sjones4.
	Upgrade JGroups to 3.4.0.Final.	pferraro

Release 2.1.0-beta-4 - 2013-08-11

Type	Changes	By
	Upgrade JGroups to 3.3.x.	pferraro
	Optimize SynchronousExecutor.invokeAll(...) and make sure reverse mode doesn't execute first task until all other tasks are complete.	pferraro
	Make DatabaseCluster references within HA-JDBC driver static. Fixes integration with Tomcat connection pooling.	pferraro
	Deactivate all local active databases upon DatabaseCluster.stop().	pferraro
	If DatabaseCluster fails to start, stop it before clearing its reference from the Registry.	pferraro
	Add Dialect.isValid(Connection) to allow workaround for dialects that do not implement Connection.isValid(int).	pferraro
	Don't create a proxy for null results, e.g. ResultSet.getClob(...).	pferraro
	Use a new TreeMap to store results, not an immutable singleton map.	pferraro
	Fixed parsing bug in Driver.getMajorVersion()/getMinorVersion() that prevented deployment on JBoss AS7.	pferraro
	Allow DataSource Reference to define config using URI (not just serialized form).	pferraro
	Add support for Blob.setBinaryStream(long), Clob.setAsciiStream(long) and Clob.setCharacterStream(long) via OutputStream and Writer, respectively.	pferraro
	Add "input-sink" configuration property to control whether InputStream and Reader-based update methods will use a file or in-memory sink.	pferraro
	When loading service providers, skip providers with missing dependencies. This way optional dependencies are truly optional.	pferraro
	REPEATABLE_READ queries should execute against primary database only.	pferraro
	Avoid classpath scan per exception, due to use of ServiceLoader to resolve exception types. Thanks to sjones4.
	Fix improper unlock logic in LocalTransactionContext which could preventing database activation. Thanks to sjones4.
	Correct reserved identifier logic to only include SQL:2003 reserved words by default. Add explicit reserved identifier overrides for PostgreSQL and MySQL.	pferraro

Release 2.1.0-beta-3 - 2012-12-09

Type	Changes	By
	Switch default durability from "fine" to "coarse".	pferraro
	Restore ability to add new databases to the cluster at runtime via JMX.	pferraro
	Ensure event source field is not lost during serialization.	pferraro
	Fix configuration file location on windows when file path contains spaces. Thanks to eskorzeny.
	Add debug logging if Connection.isValid(...) throws an exception. Otherwise, it is difficult to debug connectivity issues when connection pooling is used.	pferraro
	Complete BerkeleyDB state manager implementation. Fixes 2.	pferraro
	Always flush the output stream during state transfer. Thanks to eskorzeny.
	Fix class name of JGroupsCommandDispatcherFactory within META-INF/services/net.sf.hajdbc.distributed.CommandDispatcherFactory. Thanks to eskorzeny.
	Rename SimpleStateManagerFactory from "memory" to "simple". Thanks to eskorzeny.
	Upgrade JGroups to 3.2.4.Final.	pferraro
	XML parser should fail if dialect/durability/balancer/meta-data-cache was not found.	pferraro
	Fix formatting of JBoss Logging messages.	pferraro
	Auto-activation and auto-deactivation only need to be triggered on the group coordinator. Fixes 5.	pferraro
	Drop obsolete Dialect.getSimpleSQL().	pferraro

Release 2.1.0-beta-2 - 2012-10-27

Type	Changes	By
	Complete SQLite state manager implementation. Fixes 3.	pferraro
	Relocate default location of SQL state manager databases to $HOME/.ha-jdbc	pferraro
	Fix xml parsing of pooling configuration for state managers.	pferraro
	Fix recovery query logic in SQL state manager.	pferraro
	Fix NPE in MulitplexingDecoderFactory if password is null.	pferraro
	Fix dialect detection in SQL state manager.	pferraro
	Drop deprecated properties from default jgroups configuration.	pferraro
	Fix HSQLDB Dialect.getDefaultSchemas() to return "PUBLIC".	pferraro
	Database meta data cache should store table/schema names quoted, if necessary.	pferraro
	Allow override of identifier normalization by refactoring DatabaseMetaDataSupport into Dialect interface.	pferraro
	Upgrade Mockito to version 1.9.5.	pferraro
	Upgrade JGroups to version 3.2.0.Final.	pferraro

Release 2.1.0-beta-1 - 2012-10-11

Type	Changes	By
	Migrate source code repository to github.	pferraro
	Update Java runtime requirement to 1.6.	pferraro
	Update Java compile requirement to 1.7 (for JDBC 4.1 support).	pferraro
	Migrate build from Ant to Maven.	pferraro
	Migrate site generation from Forrest to Maven site plugin.	pferraro
	Replace JiBX with JAXB for configuration file reading/writing. Configuration schema is now auto-generated from annotations during build. XML parsing will validate against the schema.	pferraro
	Redesign HA-JDBC startup, adding support for programmatic configuration.	pferraro
	Store references to database clusters within Driver or DataSource object, rather than in the mbean server.	pferraro
	Replace mbean interfaces with dynamic mbeans created from annotations.	pferraro
	Replace java.util.prefs-based state manager with a jdbc-based or in-memory implementation. Add alternative implementations for sqlite (via sqljet) and berkeleydb.	pferraro
	Add generic pooling mechanism for use by state managers.	pferraro
	Add ability to obfuscate passwords stored in HA-JDBC configuration file. Supported mechanisms: plain text, hex encoding, base-64 encoding, symmetric encryption.	pferraro
	Add support for version (e.g. last update timestamp) columns to differential sync strategy. This improves the general performance of change detection from O(N*M) -> O(N), where N is number of rows, and M is number of columns.	pferraro
	Changed failure detection handling to always prefer response from the designated primary database (instead of always preferring successful responses). Apply the same logic to resolve jdbc method result conflicts.	pferraro
	Add durability support to detect and recover from node crashes during commit, enabled by default.	pferraro
	Improve reliability of distributed lock manager by locking coordinator first, then broadcasting lock acquisition event to other members.	pferraro
	Use exception introspection to determine whether a not a given failure is catastrophic, replacing separate simple query.	pferraro
	Add per-database eager and lazy meta data cache implementations - useful for schemas with auto-generated constraint names. Options for meta-data-cache="eager\|shared-eager\|lazy\|shared-lazy\|none".	pferraro
	Create logging facade to support parameterized log messages to avoid string evaluation if message won't be logged. Prefer jboss-logging provider, fall back to slf4j, commons-logging, then to jdk logging. This removes any explicit runtime dependency on a particular logging framework.	pferraro
	Reverse invocation order of commit/rollback using serial transaction mode. The first database to acquire a row lock should be the last to commit.	pferraro
	Replace deprecated JGroups channel multiplexer with shared transport.	pferraro
	Configuration file now specifies synchronization strategies, state manager provider, and distributable capabilities provider via identifiers instead of class names. Uses service loader mechanism for extensibility.	pferraro
	Modify configuration of balancer, dialect, durability, password codecs, and meta-data cache to use service loader mechanism for extensibility.	pferraro
	Copy CronExpression from Quartz code base instead of pulling in entire artifact. HA-JDBC no longer has any required dependencies.	pferraro
	Support system property expansion in configuration file, via ${property} notation.	pferraro

Release 2.0.16 - Pending

Type	Changes	By
	Fix unintentional configuration export during initial startup for datasource, pool-datasource, and xa-datasource configs.	pferraro
	In DatabaseMetaDataSupportImpl.quote(...), use case-insensitive comparison when determining if identifier is a keyword.	pferraro
	Using non-zero fetchSize in full and differential sync strategies requires auto-commit off in PostgreSQL. Fixes 2850077.	pferraro
	Connection.setAutoCommit(...) should use a end-transaction invocation strategy, yet still be recordable.	pferraro
	Upgrade JGroups to 2.6.12.	pferraro
	If first database activation fails during auto-activate, just log failure and continue with next failed database.	pferraro

Release 2.0.16-rc-1 - 2009-06-21

Type	Changes	By
	Fixed NullPointerException in PreparedStatement.set/ResultSet.update stream/reader/blob/clob methods, if called with null value. Fixes 2684746.	pferraro
	Only consider hashed unique indexes when finding unique constraints. Fixes 2688439.	pferraro
	Ensure unique constraint columns are quoted, if necessary.	pferraro
	Fix memory leak caused by batch method recording when using PreparedStatement pooling. Fixes 2728324.	pferraro
	Optimize recording of ResultSet navigation and update methods.	pferraro
	Fix recording of CallableStatement.registerOutParameter(...) methods.	pferraro
	Fix differential sync strategy breakage when a table contains only primary key columns. Fixes 2688421.	pferraro
	Determine column meta data from ResultSetMetaData instead of DatabaseMetaData.getColumns(...). This avoids the need for dialect specific IDENTITY column detection logic. Fixes 2770743. Thanks to Karl Moore.	pferraro
	Fixed StandardDialect.getIdentifierPattern(DatabaseMetaData) to require that identifiers begin with a letter.	pferraro
	Upgraded JGroups to 2.6.10.	pferraro
	Upgraded JiBX to 1.2.1.	pferraro
	Upgraded Quartz to 1.6.5.	pferraro
	Upgraded SLF4J to 1.5.7.	pferraro
	Upgraded EasyMock to 2.5.1.	pferraro
	Upgraded TestNG to 5.9.	pferraro

Release 2.0.15 - 2009-02-17

Type	Changes	By
	Fixed infinite loop regression in DistributableLockManager$DistributableLock.tryLock(long, TimeUnit)	pferraro
	Fixed ExceptionInInitializerError regression when creating HA-JDBC connections in Java 1.4/1.5.	pferraro

Release 2.0.14 - 2009-02-15

Type	Changes	By
	Fixed parsing of local attribute of database, datasource, etc.	pferraro

Release 2.0.14-rc-1 - 2009-01-25

Type	Changes	By
	Upgraded JiBX to 1.1.6a.	pferraro
	Upgraded SLF4J to 1.5.6.	pferraro
	Upgraded Retrotranslator to 1.2.8.	pferraro
	Upgraded JGroups to 2.6.7.	pferraro
	Upgraded Quartz to 1.6.4.	pferraro
	Upgraded EasyMock to 2.4.	pferraro
	Remove file list items during FileSupport.close() - rather than wait for finalization. Fixes 2004105.	pferraro
	FileSupport is no longer used for large object support and is now created/destroyed per statement, rather than per connection. This helps mitigate temp file build-up. Fixes 2004105.	pferraro
	Removed references to javax.sql.CommonDataSource - this broke binary compatibility with Java 1.4/1.5 for datasource configurations.	pferraro
	Fixed java 1.4 binary incompatibility with Boolean (does not yet implement Comparable) not handled by Retrotranslator.	pferraro
	Restore autoCommit mode to its original value at the end of synchronize(...) in each strategy. Thanks to Ben Short.	pferraro
	Fixed regression in lazy/none meta-data-cache that broke synchronization.	pferraro
	Fixed misleading Spanish, French, Italian, and Portuguese translation of config-not-found message.	pferraro
	Store child proxies using weak references to fix potential memory leak if proxy is not closed.	pferraro
	Remote locks in DistributableLockManager now respect lock fairness.	pferraro
	Startup will now also consult ha-jdbc.{0}.configuration system property when searching for configuration file.	pferraro
	Add HA proxying of DatabaseMetaData interface.	pferraro
	Added net.sf.hajdbc.util.servlet.DatabaseClusterShutdownContextListener to automatically shutdown a list of database clusters scoped to a servlet context. The clusters to shutdown are defined in a comma delimited init parameter: ha-jdbc.clusters Fixes 2103533.	pferraro

Release 2.0.13 - 2008-05-20

Type	Changes	By
	Fixed SybaseDialect.getSimpleSQL() to query for GETDATE(). Thanks to Jason Rosenberg.	pferraro
	Added event handler support for activation, deactivation, and synchronization events. Clients can opt to be notified of such events by registering themselves as handlers using the appropriate methods on the database cluster mbean.	pferraro
	Fixed close() methods of Connection, Statement, and ResultSet proxies to use driver (instead of database) write invocation strategy to prevent unnecessary creation of SQL objects (potentially triggering query execution) just to be closed.	pferraro
	Fixed exception handling in FullSynchronizationStrategy. Exceptions wrapped as SQLException were not getting re-thrown. Thanks to Maris Orbidans.	pferraro
	Fixed logic in DatabaseMetaDataSupport.quote(String) to properly deal with identifier case.	pferraro
	Fixed synchronization to allow schemas with auto-generated constraint names (i.e. constraint names are not uniform in all databases) to function properly when meta-data-cache="none".	pferraro
	Fixed bug where statements created from read-only connections were not getting properly load balanced.	pferraro
	Added explicit, Referenceable DataSource, ConnectionPoolDataSource, and XADataSource proxy implementations. The <name> element of a <datasource>, <pool-datasource>, or <xa-datasource> configuration can define a data source implementation class name. If the <name> element is a class name, then the subsequent <property name="..."> elements will be interpreted as property values of the data source (e.g. serverName, portNumber, databaseName).	pferraro
	Added missing definitions for <pool-datasource> and <xa-datasource> to DTD and XSD.	pferraro
	Calls to PreparedStatement.addBatch() were not being recorded and, consequently, not getting replayed when a new database is activated.	pferraro
	Fixed AcquireLockDecree to use write locks, instead of a read locks, so that database activation will block transactions on remote nodes. Fixes 1964456.	pferraro
	Upgraded TestNG to 2.8.	pferraro

Release 2.0.12 - 2008-03-18

Type	Changes	By
	Fixed case normalization in DatabaseMetaDataSupport.normalize(String, String).	pferraro
	Fixed NullPointerException using CallableStatement stream methods.	pferraro
	Optimized Balancer implementations using copy-on-write concurrent collections.	pferraro
	Eliminated some unnecessary runtime reflection.	pferraro
	Fixed potential deadlock when synchronization is triggered while there are open transactions. Refactored statement read locking to lock and unlock at transaction boundaries. Removed obsoleted table locking in synchronization strategies.	pferraro
	Added ConnectionPoolDataSource and XADataSource proxies, the latter required to detect distributed transaction boundaries. Added necessary <xa-datasource> and <pool-datasource> configuration file elements.	pferraro
	Renamed net.sf.hajdbc.sql.DataSource to net.sf.hajdbc.DataSourceFactory. This should hopefully eliminate some confusion about its usage, as it is a javax.naming.spi.ObjectFactory and not a java.sql.DataSource implementation.	pferraro
	Fixed Spanish translation of log messages. Thanks to Alejandro Domenech.	pferraro
	Added linked source to javadoc.	pferraro
	Upgraded Retrotranslator to 1.2.6.	pferraro
	Upgraded JGroups to 2.6.2.	pferraro
	Upgraded SLF4J to 1.5.0.	pferraro

Release 2.0.11 - 2008-01-14

Type	Changes	By
	Replaced accidental use of Method.getTypeParameters() with intended Method.getParameterTypes() in AbstractInvocationHandler. This fixes bug where state changing methods were not recorded properly and subsequently not replayed correctly on newly activated databases.	pferraro

Release 2.0.10 - 2008-01-08

Type	Changes	By
	Fixed CronThreadPoolExecutor to work around potential inaccuracies in java.util.Date that could cause a task to be scheduled multiple times in a single cron interval.	pferraro
	Connection.setReadOnly() should use DatabaseWriteInvocationStrategy instead of DriverWriteInvocationStrategy.	pferraro
	Refactored invoker recording to support any JDBC method regardless of InvocationStrategy implementation.	pferraro
	Fixed replay of PreparedStatement and CallableStatement set*() methods for a newly activated database.	pferraro
	Cleanup logic in DatabaseWriteInvocationStrategy by splitting into TransactionalDatabaseWriteInvocationStrategy and NonTransactionalDatabaseWriteInvocationStrategy.	pferraro
	Rollback TestNG to 5.6. Version 5.7 mysteriously skipped test methods.	pferraro
	CallableStatement does not need to parse out sequences nor identity columns, nor detect SELECT...FOR UPDATE in SQL.	pferraro
	Fixed broken test cases.	pferraro

Release 2.0.9 - 2007-12-28

Type	Changes	By
	In DatabaseWriteInvocationStrategy, acquire read locks before Balancer.all() so that a newly activated database will not miss any pending write statements.	pferraro
	Upgraded JGroups to 2.6.1.	pferraro

Release 2.0.8 - 2007-11-19

Type	Changes	By
	Fixed infinite loop in CronThreadPoolExecutor when scheduled task throws an ExecutionException. Fixes 1832392. Thanks to gamani.	pferraro
	Upgraded JGroups to 2.6.0.	pferraro

Release 2.0.7 - 2007-11-09

Type	Changes	By
	Added local="true\|false" attribute to database/datasource. Cluster panic detection now consults this flag instead of weight to determine whether a database is local or remote.	pferraro
	LocalLockManager now uses a custom semaphore-based ReadWriteLock implementation instead of ReentrantReadWriteLock. Removed obsolete DistributableLockAdapter hack.	pferraro
	Optimized DistributableLockManager using RpcDispatcher instead VotingAdapter.	pferraro
	Fixed deadlocking in DistributableLockManager when simultaneous voting occurs for he same resource from different peers.	pferraro
	Upgraded Retrotranslator to 1.2.3.	pferraro
	Upgraded TestNG to 5.7.	pferraro

Release 2.0.6 - 2007-10-17

Type	Changes	By
	Fixed exception handling during startup to prevent subsequent javax.management.InstanceAlreadyExistsExceptions if database cluster fails to start.	pferraro
	Fixed potential deadlocking sources and improved cpu friendliness of DistributableLockManger. Fixes 1814865.	pferraro

Release 2.0.5 - 2007-10-15

Type	Changes	By
	Fixed bug in Dialect.getAlterSequenceSQL(...) and Dialect.getAlterIdentityColumnSQL(...) causing values > 999 to get formatted with grouping separators. Fixes 1811698.	pferraro
	Added "cluster panic" detection to prevent asymmetric database deactivation during a network fragmentation when in distributable mode where databases are colocated on peer nodes. If HA-JDBC detects a cluster panic, the cluster is stopped. Manual intervention is required to resolve any consequent synchronization problems and to start the cluster. Fixes 1738533.	pferraro
	Removed obsolete JBoss jmx-console FAQ entry.	pferraro

Release 2.0.4 - 2007-10-04

Type	Changes	By
	Added look-ahead and to Dialect.evaluateCurrentTime() regular expression so that it does not match CURRENT_TIMESTAMP functions.	pferraro
	Fixed NullPointerException regression in DistributableLockManager preventing database activation in distributable mode.	pferraro
	Use new official JDK 1.4 backport of JGroups instead of retrotranslating our own.	pferraro

Release 2.0.3 - 2007-09-24

Type	Changes	By
	Upgraded JGroups to 2.5.1.	pferraro
	Fixed infinite loop in DistributableLockManager while acquiring a lock when only one peer node is present. Fixes 1799618.	pferraro
	Fixed missing membership listener registration in DistributableLockManager preventing proper lock cleanup.	pferraro
	Defer creation of connection factories until needed since DataSource creation relies on JNDI environment properties that may not yet be established. Fixes 1796975.	pferraro

Release 2.0.2 - 2007-09-14

Type	Changes	By
	Added Dialect.getIdentifierPattern(...) method to work around buggy DatabaseMetaData.getExtraNameCharacters() in PostgreSQL driver since version 8.1. Bug causes unexpected failures during identity column detection when schema or table name contains non-standard characters.	pferraro
	Optimized StandardDialect.getDefaultSchemas() by replacing separate CURRENT_USER query with DatabaseMetaData.getUserName().	pferraro
	Fixed example Tomcat DataSource configuration.	pferraro
	Fixed currentTimestampFunction() method of MaxDBDialect.	pferraro
	Created separate OracleDialect, formerly an alias of MaxDBDialect.	pferraro
	Created separate H2Dialect, formerly an alias of HSQLDBDialect.	pferraro
	Added new dialect for Sybase.	pferraro
	Added evaluateCurrentDate(String, java.sql.Date), evaluateCurrentTime(String, java.sql.Time), evaluateCurrentTimestamp(String, java.sql.Timestamp), and evaluateRandom(String) to Dialect interface to replace non-deterministic SQL functions (e.g. CURRENT_TIMESTAMP, RAND()) with deterministic static values. Added optional eval-current-date, eval-current-time, eval-current-timestamp, and eval-rand cluster attribute to enable these behaviors.	pferraro
	Both sequence and identity column detection are no longer enabled by default.	pferraro
	Removed supportsSequences() and supportsIdentityColumns() methods from Dialect interface. The corresponding parseSequence(String) and parseInsertTable(String) methods now return null for dialects that do not support these features.	pferraro
	Fixed race condition in DistributableLockAdapter that may prevent a lock from being released.	pferraro
	Upgraded SLF4J to 1.4.3.	pferraro
	Added SynchronizationSupport.synchronizeIdentityColumns(...). Consequently, MySQL AUTO_INCREMENT columns are now fully supported.	pferraro
	Added DatabaseProperties.getSequences() and TableProperties.getIdentityColumns() to meta data cache facility.	pferraro

Release 2.0.1 - 2007-07-23

Type	Changes	By
	LazyDatabaseMetaDataCache now caches DatabaseProperties using a SoftReference to prevent the cache from causing OutOfMemoryErrors.	pferraro
	Refactored ThreadLocalDatabaseMetaDataCache to NullDatabaseMetaDataCache which no long stores its DatabaseProperties instance in a ThreadLocal since this can inadvertently act like a lazy cache if application threads are pooled. Replaced SynchronizationContext.getDatabaseMetaDataCache() with SynchronizationContext.getDatabaseProperties() so that meta data used during synchronization is still cached for the lifetime of the SynchronizationContext, regardless of cache implementation.	pferraro
	Re-implemented BalancerFactory, DialectFactory, and DatabaseMetaDataCacheFactory using enums.	pferraro
	In DatabaseMetaDataSupport.normalize(...), adjust case of table to match the way identifiers are stored in the database.	pferraro
	In DatabaseMetaDataSupport.quote(...), normalize identifiers to lower case if database is case-insensitive, yet stores identifiers in mixed case.	pferraro
	Fixed all benign compiler warnings reported by Eclipse.	pferraro
	Migrated simple string constants to Strings.	pferraro

Release 2.0.0 - 2007-07-16

Type	Changes	By
	Optimized failure handling in DatabaseWriteInvocationStrategy.	pferraro
	Optimized thread synchronization in DistributableLockAdapter.	pferraro
	Upgraded EasyMock to 2.3.	pferraro
	Upgraded SLF4J to 1.4.2.	pferraro
	Upgraded JGroups to 2.5 GA.	pferraro
	Revised documentation.	pferraro

Release 2.0-rc-4 - 2007-07-07

Type	Changes	By
	In distributable mode, try to retrieve initial state from any remote node, not just "coordinator".	pferraro
	Fixed deadlocking during activation/deactivation in distributable mode caused by redundant secondary notifications.	pferraro
	In distributable mode, do not send activation notifications to other nodes during cluster startup.	pferraro
	In distributable mode, do not respond to initial state queries until cluster startup is complete.	pferraro
	Upgraded SLF4J to 1.4.1.	pferraro

Release 2.0-rc-3 - 2007-07-02

Type	Changes	By
	FailureDetectionTask and SQLProxy.handleFailure() will not deactivate any databases if they all appear to be dead.	pferraro
	Convert dynamic Class.cast() and Class.isInstance() to static cast and instanceof expressions wherever possible.	pferraro
	Fixed bug during initialization where databases are added as dirty, triggering export of configuration file.	pferraro
	When adding a database to the cluster, perform duplicate id check before registering database to avoid InstanceAlreadyExistsException.	pferraro
	Fixed broken error message when attempting to remove a database that is still active.	pferraro

Release 2.0-rc-2 - 2007-06-25

Type	Changes	By
	Added toString() to DatabaseClusterMBean interface so that log messages will display cluster id properly.	pferraro
	Fixed IllegalAccessError in JiBX marshalling during configuration export.n Thanks to David White.	pferraro
	Removed Retrotranslator plugin for java.lang.management.ManagementFactory. This is now natively supported by Retrotranslator.	pferraro
	Upgraded Retrotranslator to 1.2.2.	pferraro

Release 2.0-rc-1 - 2007-06-18

Type	Changes	By
	Fixed memory leak with CONCUR_READ_ONLY result sets when using ResultSet.getStatement().close().	pferraro
	Removed problematic singleton references to database clusters in DatabaseClusterFactory.	pferraro
	Require separate XML config file per database cluster.	pferraro
	Consolidated database-cluster and datasource cluster elements into single cluster element, as in 1.1. Removed id attribute from cluster element.	pferraro
	Modified configuration locator logic to first check driver connection properties or datasource config property for resource URL. Default resource name is now ha-jdbc-{0}.xml, where {0} is the cluster id.	pferraro
	Added test for UnsupportedOperationException thrown when Quartz cron expression uses both day-of-week and day-of-month values. Thanks to Hanson Char.	pferraro
	If a group member leaves, any distributed locks it held must be freed.	pferraro
	DistributableLockManager uses default vote response processor instead of its own implementation.	pferraro
	Removed quoting of cluster ID and database ID in mbean ObjectName. JBoss users no longer need to patiently wait for this long standing jmx-console bug (http://jira.jboss.com/jira/browse/JBAS-2037) to be fixed.	pferraro
	Fixed NoSuchElementException thrown during database activation when there are no active databases.	pferraro
	Fixed IllegalMonitorStateExceptions in DistributableLockManager resulting from improper use of reentrant locks by multiple threads.	pferraro
	Optimized DistributableLockManager using a single phase VotingAdapter.	pferraro
	Re-implemented DistributableStateManager to use synchronous MessageDispatcher instead of asynchronous NotificationBus. This will ensure that all nodes are notified of database activation prior to unlocking database tables during synchronization. Changed default jgroups protocol stack to "udp-sync".	pferraro
	Do not auto-deactivate the last database of a cluster.	pferraro
	JGroups 2.5 uses Java 1.5 as a baseline, so retrotranslate this jar as part of 1.4 build.	pferraro
	Modified build to produce 3 different binary distributions, for Java 1.4, 1.5, and 1.6.	pferraro
	Upgraded SLF4J to 1.4.0.	pferraro
	Upgraded JiBX to 1.1.5.	pferraro
	Upgraded JGroups to 2.5.0-cr1.	pferraro
	Upgraded TestNG to 5.6.	pferraro

Release 2.0-beta-1 - 2007-04-23

Type	Changes	By
	Optimized PostgreSQLDialect.getLockTableSQL() by removing unnecessary select statement. Thanks to David Goodenough.	pferraro
	Removed JVM shutdown hook since it may prevent proper shutdown of a server-managed connection pool.	pferraro
	Fixed NullPointerException accessing meta data if database does not support schemas. Fixes 1618746.	pferraro
	Refactored Balancer.list() to return a set to better reflect balancer semantics.	pferraro
	Refactored DatabaseClusterMBean interface into DriverDatabaseClusterMBean and DataSourceDatabaseClusterMBean. LocalDatabaseCluster refactored into generic AbstractDatabaseCluster. Replaced <cluster> element in DTD with <database-cluster> and <datasource-cluster>.	pferraro
	Created StateManager to encapsulate management of database cluster state.	pferraro
	Distributable functionality no longer added via inheritance, but through lock manager and state manager implementations.	pferraro
	Created schema definition of HA-JDBC configuration as an alternative to DTD.	pferraro
	Reimplemented core logic to use dynamic instead of explicit proxies, decoupling HA-JDBC from a specific version of the JDBC API. Resulting jar is approximately half the size as before.	pferraro
	Refactored SynchronousExecutor implementation to extend AbstractExecutorService since the ExecutorService interface in Java 1.6 is not compatible with that of 1.5.	pferraro
	Java 1.6 adds auto-increment column identification to DatabaseMetaData.getColumns(). Added isAutoIncrement() to ColumnProperties interface populated only if this information exists. This value is now be consulted prior to querying the dialect to identify identity columns.	pferraro
	Fixed regular expressions in dialects to properly negotiate whitespace.	pferraro
	Added support for JDBC 4.0 (i.e. Java 1.6).	pferraro
	Added support for mutable LOBs.	pferraro
	Added Java 1.6 service provider hook for HA-JDBC driver.	pferraro
	Added max batch size property to differential synchronization strategy to help prevent out of memory errors when a table contains many changes.	pferraro
	Use platform mbean server for cluster/database mbean registration. Provide retrotranslator plugin for java.lang.management.ManagementFactory that uses old logic to locate mbean server.	pferraro
	Forced cleanup of open java.sql objects that were not accessed during an deactivate/reactivate cycle.	pferraro
	Fixed german message transations. Thanks to Kurt Huwig.	pferraro
	Upgraded JiBX to 1.1.3.	pferraro
	Upgraded JGroups to 2.5.0-beta-2. concurrent-*.jar is now obsolete.	pferraro
	Upgraded SLF4J to 1.3.1.	pferraro
	Upgraded Retrotranslator to 1.2.1.	pferraro
	Upgraded Woodstox to 3.2.1.	pferraro
	Upgraded TestNG to 5.5.	pferraro
	Added JDBC RowSet API to Java 1.4 runtime dependencies.	pferraro
	Updated documentation to use Forrest 0.8.	pferraro

Release 1.2-beta-7 - 2006-12-01

Type	Changes	By
	Fixed sequence synchronization logic to use next value instead of current value since it may be undefined.	pferraro
	Refactored SynchronizationStrategy interface into distinct prepare (e.g. lock), synchronize, and cleanup (e.g. unlock) stages.	pferraro
	Created SynchronizationContext to simplify SynchronizationStrategy interface methods.	pferraro
	Refactored CronExecutorService to use CronExpression instead of CronTrigger.	pferraro
	Changed default distributable stack to "udp".	pferraro
	Disabled support for identity columns in MySQL dialect. MySQL's implementation has no mechanism to synchronize auto-increment counter.	pferraro
	Upgraded JGroups to 2.4 GA (final).	pferraro
	Upgraded Retrotranslator to 1.1.0.	pferraro
	Upgraded Quartz to 1.6.0.	pferraro
	Upgraded Woodstox to 3.1.0.	pferraro
	Upgraded SLF4J to 1.1.0 RC1.	pferraro
	Upgraded TestNG to 5.3.	pferraro

Release 1.2-beta-6 - 2006-10-24

Type	Changes	By
	Added support for identity columns.	pferraro
	Added new cluster attributes "detect-sequences" and "detect-identity-columns".	pferraro
	Added dialect implementations for Ingres and Mckoi.	pferraro
	Upgraded Woodstox to 3.0.2.	pferraro
	Fixed PostgreSQL Blob/Clob handling in differential and full synchronization strategies when large objects require updating.	pferraro
	Refactored DefaultDialect to StandardDialect and renamed dialect alias from "default" to "standard".	pferraro

Release 1.2-beta-5 - 2006-09-22

Type	Changes	By
	Upgraded TestNG to 5.2.	pferraro
	Fixed binding compilation error that only seemed to affect windows users.	pferraro
	Fixed mbean registration race condition during startup in distributable mode.	pferraro

Release 1.2-beta-4 - 2006-09-11

Type	Changes	By
	Upgraded JGroups to 2.4-cr-2.	pferraro
	Upgraded Woodstox to 3.0.1.	pferraro
	Upgraded TestNG to 5.1.	pferraro
	Force cleanup of underlying connections, statements, and result sets when a database is deactivated. Fixes 1543962.	pferraro
	Log cause of DatabaseCluster.isAlive(Database) failures.	pferraro
	Fixed bug in DatabaseMetaDataSupport.getForeignKeyConstraints() causing method to always return an empty collection.	pferraro
	Fixed bug in PostgreSQLDialect.getSequences(...) causing method to fail to when database does not contain any sequences.	pferraro

Release 1.2-beta-3 - 2006-08-26

Type	Changes	By
	Fixed bug in DifferentialSynchronizationStrategy where generated select statements had duplicated columns.	pferraro
	Extracted interfaces from ColumnProperties, ForeignKeyConstraint, and UniqueConstraint. Implementations refactored into net.sf.hajdbc.cache package.	pferraro
	Added long needed unit tests for each synchronization strategy.	pferraro
	Upgraded JGroups to 2.4-cr-1.	pferraro
	Upgraded Retrotranslator to 1.0.8.	pferraro
	Fixed bugs in MySQLDialect related to generating SQL for creating and dropping foreign keys and unique constraints. Thanks to Stephan Hesse.	pferraro

Release 1.2-beta-2 - 2006-08-10

Type	Changes	By
	Upgraded TestNG to 5.0.1.	pferraro
	Upgraded Woodstox to 3.0.0.	pferraro
	Fixed premature quoting of schema and tables in DatabaseMetaDataCacheSupport.	pferraro
	Fixed NullPointerException in ThreadLocalDatabaseMetaDataCache.	pferraro
	Fixed bug in SimpleBalancer where a database deactivation would trigger the deactivation of other databases of identical weight.	pferraro

Release 1.2-beta-1 - 2006-07-19

Type	Changes	By
	Upgraded Retrotranslator to version 1.0.7.	pferraro
	Upgraded JiBX to version 1.1.	pferraro
	Replaced XMLPull runtime library with StAX API + Woodstox implementation.	pferraro
	Upgraded JGroups to version 2.3-sp1.	pferraro
	Upgraded SLF4J to version 1.0.2.	pferraro
	Upgraded Quartz to version 1.5.2.	pferraro
	Upgraded EasyMock to version 2.2.	pferraro
	Upgraded TestNG to version 5.0.	pferraro
	Fixed create/drop constraint methods of DefaultDialect to quote constraint names. Thanks to Ryan Holmes.	pferraro
	Modified Dialect interface to leverage ForeignKeyConstraint and UniqueConstraint objects to encapsulate constraint details.	pferraro
	Fixed DefaultDialect to correctly generate create foreign key statements for foreign keys containing multiple columns, ON DELETE/UPDATE actions, and deferrability.	pferraro
	Created dialects for MySQL and Firebird.	pferraro
	DerbyDialect, HSQLDBDialect, MaxDBDialect now override createForeignKeySQL().	pferraro
	Fixed synchronization of PostgreSQL tables containing Blob (oid) columns.	pferraro
	Modified differential synchronization strategy to use UPDATE statements instead of using updatable ResultSet, due to poor driver support. e.g. ResultSet.updateBlob(...) is not implemented in PostgreSQL driver.	pferraro
	Added DatabaseMetaData caching. New meta-data-cache attribute of cluster. Options are eager, lazy, or none.	pferraro
	Modified Dialect and SynchronizationStrategy interfaces to use DatabaseMetaDataCache objects.	pferraro
	Refactored Dialect interface with much simpler method signatures.	pferraro
	Leverages JGroups 2.3 multiplexing so that notification bus and distributable lock manager share the same channel. No more "discarded message from different group..." warnings in logs! "protocol" attribute of "distributable" element in DTD is replaced by "config" and "stack" attributes. Default for "config" is "stacks.xml" from JGroups distribution. Default for "stack" is "fc-fast-minimalthreads".	pferraro
	Moved mbean registration to DatabaseCluster.start() and added mbean unregistration to DatabaseCluster.stop(). HA-JDBC initialization failures will no longer leave stray registered mbeans.	pferraro
	Replaced simple read-write locking with named read-write locking encapsulated by a LockManager.	pferraro
	Added support for sequences.	pferraro
	Refactored unit tests so that test classes implement subject interfaces.	pferraro
	Fixed non-default charset handling of Clobs.	pferraro

Release 1.1 - 2006-04-21

Type	Changes	By
	Ensure that causes of initialization failures are logged.	pferraro

Release 1.1-rc-2 - 2006-04-18

Type	Changes	By
	Fixed IllegalArgumentException during startup when using transactions="xa".	pferraro
	Fixed NullPointerException during startup when database does not define a driver.	pferraro
	Fixed CronExecutorService to use daemon threads so that it doesn't prevent the shutdown hook from firing.	pferraro

Release 1.1-rc-1 - 2006-04-09

Type	Changes	By
	Upgraded Retrotranslator to version 1.0.3.	pferraro
	Fixed Blob/Clob handling in PreparedStatement.setBlob(...)/setBlob(...) and ResultSet.updateBlob(...)/updateClob(...) methods.	pferraro
	Fixed bug in DefaultDialect.qualifyTable(...) for databases that do not support schemas.	pferraro
	Added new required transactions="local\|xa" option to cluster. When in local mode, database writes are performed concurrently. When in xa mode, database writes are performed synchronously to ensure a predictable execution order and prevent deadlocks.	pferraro
	Added fault tolerance measures to cluster thread pool under high load. If pool size reaches max-threads threshold, database writes will be executed in the caller thread using java.util.concurrent.ThreadPoolExecutor.CallerRunsPolicy.	pferraro
	Upgraded TestNG to 4.7.	pferraro

Release 1.1-beta-7 - 2006-03-20

Type	Changes	By
	Added auto-activate-period cluster option that will auto-activate failed database nodes at a configurable interval. Thanks to Tapan Paul.	pferraro
	New dependency on Quartz (http://opensymphony.com/quartz/).	pferraro
	Created CronThreadPoolExecutor, a java.util.concurrent.ThreadPoolExecutor that leverages a Quartz CronTrigger to calculate future execution times of a scheduled task.	pferraro
	Enhanced auto-activation and failure detection to use a cron schedule, instead of a simple fixed-delay period. Renamed failure-detect-period to failure-detect-schedule and auto-activate-period to auto-activate-schedule in DTD.	pferraro
	Migrated repository to Subversion.	pferraro
	Migrated test suite to TestNG.	pferraro
	Migrated logging facade from commons-logging to SLF4J.	pferraro
	New dependency on SLF4J (http://slf4j.org).	pferraro
	Upgraded Retrotranslator to version 1.0.1.	pferraro
	Replaced commons-logging-1.0.4.jar with jcl104-over-slf4j.jar from SLF4J distribution.	pferraro
	Added management interface methods for adding and removing databases from a cluster.	pferraro
	Separated DatabaseMBean interface into InactiveDatabaseMBean (read-write) and ActiveDatabaseMBean (read-only).	pferraro
	Activating/Deactivating database reregisters the database using the appropriate active/inactive mbean interface.	pferraro
	Added dirty flag logic for Database attributes. If a database is dirty when it is activated, then the HA-JDBC configuration is exported.	pferraro
	Renamed "name" property of DataSource to "cluster", since "name" cannot be set by the BeanFactory from Tomcat's server.xml file.	pferraro
	Revised main documentation. Added more FAQs.	pferraro

Release 1.1-beta-6 - 2006-02-15

Type	Changes	By
	Added workaround for missing ReentrantReadWriteLock(boolean) constructor in backport-util-concurrent package.	pferraro
	Added verify flag to retrotranslator compilation to catch future Java 1.4 compatibility issues.	pferraro
	Rollback change to PostgreSQL dialect. Removed batching of lock table commands.	pferraro

Release 1.1-beta-5 - 2006-02-13

Type	Changes	By
	Database activation uses Lock.lockInterruptibly() instead of Lock.tryLock() to prevent activation from failing due to concurrent writes.	pferraro
	Fixed getLockTableSQL() from PostgreSQL dialect so that it can be executed within a batch.	pferraro

Release 1.1-beta-4 - 2006-02-10

Type	Changes	By
	Upgraded Retrotranslator to version 0.9.8.	pferraro
	Added optional failure-detect-period to configuration file. If defined, HA-JDBC will proactively detect database failures every specified number of seconds.	pferraro
	Replace DatabaseCluster.init() with start() and stop() methods.	pferraro
	Added JVM shutdown hook that calls stop() on each DatabaseCluster.	pferraro
	Derby dialect overrides getLockTableSQL(). Thanks to Kurt Huwig.	pferraro
	Refactored DistributableDatabaseCluster to extend LocalDatabaseCluster rather than contain/decorate it.	pferraro
	Refactored JiBX configuration to support both input and output binding directions.	pferraro
	Removed configuration related methods from SynchronizationStrategy interface removing the need for AbstractSynchronizationStrategy.	pferraro
	Implemented distributable read-write locking so that database writes are locked during database activation. This eliminates the need to deactivate databases that were newly actived upon completion of a database write.	pferraro
	Added mbean interfaces for Databases.	pferraro

Release 1.1-beta-3 - 2006-01-27

Type	Changes	By
	Changed exceptions thrown by DatabaseClusterMBean methods to built-in Java exceptions so that they can be interpretted by a remote JMX client.	pferraro
	Added distributable locking to prevent multiple simultaneous synchronizations on the same cluster.	pferraro
	Added configurable timeout attribute to DTD for distributable operations.	pferraro
	Moved SELECT ... FOR UPDATE pattern definition to dialect.	pferraro
	Fixed IndexOutOfBoundsException during database activation when one or more databases in the cluster is not alive.	pferraro

Release 1.1-beta-2 - 2006-01-23

Type	Changes	By
	Upgraded JiBX to version 1.0.1.	pferraro
	Upgraded JGroups to version 2.2.9.1.	pferraro
	Recorded Operations are stored in a Map keyed by class instead of a List to prevent unnecessary boundless growth. Thanks to Ilkka Lassila.	pferraro
	DifferentialSynchronizationStrategy generates bad DELETE statements when table has multiple primary keys. Thanks to Kurt Huwig.	pferraro
	Fixes german error message translations. Thanks to Kurt Huwig.	pferraro
	DatabaseClusterFactory.createDatabaseClusterFactory() throws RuntimeException instead of SQLException to prevent java.sql.DriverManager from masking root cause of HA-JDBC configuration failures.	pferraro
	Fixes potential NullPointerException if database is deactivated as a result of a read operation.	pferraro
	Migrated code base to Java 1.5.	pferraro
	Retrotranslator (http://retrotranslator.sf.net) leveraged for JDK 1.4 compatibility. Build script generates separate 1.4 jar and includes additional dependencies.	pferraro
	Replaced Balancer.toArray() : Database[] with Balancer.list() : List<Database>	pferraro
	Unit tests now use EasyMock 2.0.	pferraro
	Added requiresTableLocking() method to SynchronizationStrategy interface.	pferraro
	During database activation, table locking is only performed if required by synchronization strategy.	pferraro
	All vendor specific customizations to HA-JDBC are now encompassed in the Dialect attribute of a cluster. This replaces the validate-sql attribute of a cluster; and the truncateTableSQL, createForeignKeySQL, dropForeignKeySQL, createUniqueKeySQL, and dropUniqueKeySQL properties of the diff and full synchronization strategies.	pferraro
	Created dialects for PostgreSQL, MaxDB, Derby, HSQLDB, and a default dialect.	pferraro
	Changed default table locking query used during synchronization to use an innocuous UPDATE statement.	pferraro
	Added more explicit logging for exceptions thrown during HA-JDBC initialization that end up getting masked by JiBX.	pferraro
	Added missing rollback to exception handling in diff and full synchronization strategies. Thanks to Kurt Huwig.	pferraro
	In distributable mode, JGroups channel and protocols are registed with the mbean server.	pferraro
	Removed obsolete net.sf.hajdbc.sql.pool.xa and net.sf.hajdbc.sql.pool packages.	pferraro

Release 1.1-beta-1 - 2005-12-13

Type	Changes	By
	New dependency on JDK 1.4 backport of JDK 1.5 java.util.concurrent package.	pferraro
	Uses configurable thread pooling for asynchronously executed write operations for improved efficiency and fault tolerance under high load.	pferraro
	Uses default-minimalthreads.xml from JGroups distribution as default distributable protocol.	pferraro
	Synchronization strategies now use schema qualified table names when appropriate.	pferraro
	Upgraded JGroups to version 2.2.9.	pferraro
	Fixed problematic co-dependency between DatabaseCluster and ConnectionFactory.	pferraro

Release 1.0 - 2005-09-22

Type	Changes	By
	Fixed JDK 1.4 source compatibility issues. Thanks to Roman Kurmanowytsch.	pferraro
	Added explicit logging to expose root causes of exceptions that are hidden by JiBX.	pferraro
	Added FAQ section for manually deleting local cluster state.	pferraro
	Added FAQ section for distinguishing application database users vs. HA-JDBC database users.	pferraro
	Upgraded EasyMock to version 1.2.	pferraro

Release 1.0-rc-5 - 2005-09-15

Type	Changes	By
	During DatabaseClusterFactory initialization, if no mbean server can be found, an exception is thrown, rather than attempting to create a new one.	pferraro
	Quote all identifiers used in synchronization to prevent SQL syntax errors in identifier is a reserved word.	pferraro

Release 1.0-rc-4 - 2005-09-06

Type	Changes	By
	Correct error message when connection to config url fails. Thanks to Nick Rudnick.	pferraro
	Avoid wrapping SQLException cause when a database operation fails.	pferraro
	Added FAQ section for running HA-JDBC under Tomcat 5.0.	pferraro
	Fixed readProperties() and writeProperties(...) methods of AbstractSynchronizationStrategy to ignore the property "class". Thanks to Matthew Wooller.	pferraro
	Reintroduced PassiveSynchronizationStrategy.	pferraro
	Added logic to LocalDatabaseCluster.loadState() to validate locally persisted cluster state.	pferraro

Release 1.0-rc-3 - 2005-08-23

Type	Changes	By
	Fixed NullPointerException bug in LocalDatabaseCluster.loadState().	pferraro
	Distributable database activation commands should not reinvoke synchronization.	pferraro

Release 1.0-rc-2 - 2005-08-21

Type	Changes	By
	SELECT...FOR UPDATE queries are now detected and distributed to each database cluster node.	pferraro
	Corrected German translation of error messages. Thanks to Nick Rudnick.	pferraro
	Fixed infinite loop in AbstractSynchronizationStrategy.getProperties().	pferraro
	Fixed bug in LocalDatabaseCluster.loadState() when cluster is empty.	pferraro

Release 1.0-rc-1 - 2005-08-02

Type	Changes	By
	Refactored HA-JDBC initialization and DTD. Synchronization strategies are now shared across all clusters. Each cluster defines a default synchronization strategy.	pferraro
	Added properties to cluster configuration to allow DataSources to define custom JNDI environment parameters and to allow Driver to define additional runtime parameters.	pferraro
	Changed default JGroups protocol stack to use FD instead of FD_SOCK.	pferraro
	activate(String) method in DatabaseClusterMBean interface will synchronize using the default synchronization strategy for the cluster.	pferraro
	Removed getSynchronizationStrategies() from DatabaseClusterMBean interface.	pferraro
	Fixed ClassCastException during XADataSource initialization.	pferraro
	SQLException wrapper properly reports vendor-specific error code and SQL state.	pferraro
	Updated DifferentialSynchronizationStrategy to use PreparedStatements for inserts and deletions instead of using problematic updatable result set methods.	pferraro
	Fixed DifferentialSynchronizationStrategy to drop and re-create unique keys on each table to prevent possible unique constraint violations during sync.	pferraro
	DifferentialSynchronizationStrategy now correctly compares byte[] columns.	pferraro
	Migrated unit tests from TestNG to JUnit in order to utilize EasyMock.	pferraro
	Added unit tests for net.sf.hajdbc.sql package.	pferraro
	Upgraded Forrest documentation to version 0.7.	pferraro
	Upgraded JGroups to version 2.2.8.	pferraro
	Upgraded JiBX to version 1.0-rc-1.	pferraro

Release 1.0-beta-8 - 2005-04-27

Type	Changes	By
	Cluster state is now persisted locally so that it can be restored between application restarts.	pferraro
	Added customizable fetchSize property to each synchronization strategy to avoid out of memory errors when synchronizing large tables.	pferraro
	Added TestNG unit tests for Driver, Connection, Statement, and each balancer implementation.	pferraro
	Fixed issue with driver returning non-distributable connections when in distributable mode.	pferraro
	Fixed issue in DifferentialSynchronizationStrategy with some updatable result set implementations where inserted rows were deleted again.	pferraro
	Fixed ClassCastException in Connection.releaseSavepoint(Savepoint) and Connection.rollback(Savepoint) methods.	pferraro
	Minor fixes to zero weight handling in random and load balancers.	pferraro
	Corrected German translation of error messages. Thanks to Oezcan Acar.	pferraro
	executeWriteToDatabase() will now throw SQLException for Statements and ResultSets if some valid databases fail while others succeed and auto-commit is off, giving the client the opportunity to rollback the current transaction.	pferraro
	Connection.isReadOnly() was changed from executeReadFromDatabase() to executeReadFromDriver().	pferraro
	Refactored java.sql.* proxy classes.	pferraro
	Upgraded JiBX to version 1.0-rc-0.	pferraro

Release 1.0-beta-7 - 2005-04-05

Type	Changes	By
	Fixed buggy weighted round-robin algorithm.	pferraro
	Round-robin balancer now handles databases with 0 weight properly.	pferraro

Release 1.0-beta-6 - 2005-03-31

Type	Changes	By
	Database cluster now specifies 1 of 4 different strategies for balancing read requests: simple, random, round-robin, or load.	pferraro
	A database can define a weight to affect how it is prioritized by the balancer.	pferraro
	In distributed environment, a database cluster will get its initial state from the JGroups group coordinator.	pferraro
	Fixed bug where auto (i.e. non-manual) database deactivation behaved locally even if environment is distributed.	pferraro
	Fixed bug where synchronization strategies will fail if foreign key constraints have names that require quoting (e.g. $1, $2).	pferraro
	Lots of refactored code. Most notably, the HA-JDBC driver has moved to net.sf.hajdbc.sql.Driver	pferraro
	Protocol parameter is now optional for distributable clusters.	pferraro
	Added error message translations for German, Spanish, French, Italian, and Portuguese. Thanks to AltaVista Babel Fish.	pferraro
	Added error message for tables without primary keys in DifferentialSynchronizationStrategy.	pferraro

Release 1.0-beta-5 - 2005-03-03

Type	Changes	By
	Added better data type support for SynchronizationStrategy properties.	pferraro
	Fixed Java 1.4 compatibility.	pferraro

Release 1.0-beta-4 - 2005-02-18

Type	Changes	By
	getActiveDatabases() and getInactiveDatabases() no longer throw SQLException	pferraro
	Configuration DTD updated: Synchronization strategies and properties are now explicitly defined per cluster.	pferraro
	Added getSynchronizationStrategies() method to cluster management interface.	pferraro
	Changed symantics of activate(...) methods on management interface: activate(String, String) uses synchronization strategy identifier instead of class name; activate(String) now activates a database without synchronizing.	pferraro
	PassiveSynchronizationStrategy is obsolete. Use activate(String) instead.	pferraro
	synchronize() method of SynchronizationStrategy interface no longer uses DatabaseClusterDescriptor.	pferraro
	Fixed various bugs in documentation and javadoc.	pferraro

Release 1.0-beta-3 - 2005-02-07

Type	Changes	By
	All log/exception messages are now localized.	pferraro
	Driver is no longer required when defining a driver-based cluster since underlying driver already be registered via the jdbc.drivers system property.	pferraro
	Fixed bug in SQLException when nested exception chain is already initialized.	pferraro

Release 1.0-beta-2 - 2005-01-08

Type	Changes	By
	Added JMX interface to DatabaseCluster to allow administration of each cluster.	pferraro
	Refactored cluster initialization and management.	pferraro
	Distributable behavior implemented using command pattern.	pferraro
	Restructured configuration DTD adding new synchronization-related cluster properties.	pferraro
	Refactored distributable behavior to support activation.	pferraro
	Added ability to activate a failed database.	pferraro
	Created database synchronization strategies used during activation.	pferraro
	Allow simple names for DriverManager-based database cluster.	pferraro
	Enhanced large object support.	pferraro
	Upgraded Forrest documentation to v0.6.	pferraro

Release 1.0-beta-1 - 2004-10-01

Type	Changes	By
	Fixed bug in connection.rollback()	pferraro
	Fixed logic in PreparedStatement/CallableStatement.setXXXStream() and ResultSet.updateXXXStream() methods	pferraro
	Optimized asynchronous execution of write operations.	pferraro
	Improved consistancy of cluster when autocommit is true.	pferraro
	Upgraded JGroups to v2.2.7	pferraro
	Prevent multiple logging of database deactivation	pferraro

Release 1.0-alpha-3 - 2004-08-30

Type	Changes	By
	Configuration DTD is now PUBLIC	pferraro
	Upgraded JGroups to v2.2.6	pferraro
	Fixed thread safety bug in SQLProxy.executeWrite()	pferraro
	Changed license to LGPL, added license details to source code	pferraro
	Removed obsolete RowSetProxy class, javax.sql.RowSet implementation are implicitly supported	pferraro
	Refactored package names to reflect project name	pferraro
	Replaced CHANGES.txt with this page	pferraro

Release 1.0-alpha-2 - 2004-07-17

Type	Changes	By
	Added ability specify location of configuration file using a system property	pferraro
	Extended classpath search for configuration file to include system classpath	pferraro
	Fixed DataSource proxy initialization	pferraro
	DriverProxy now expects the cluster name to match the JDBC url	pferraro
	Several refactorings affecting configuration dtd	pferraro
	Fixed bug in clean target of ant build file	pferraro

Release 1.0-alpha-1 - 2004-07-14

Type	Changes	By
	Initial Release	pferraro