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release_notes.md

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Version 0.9.3 (2013-06-02)

CRITICAL upgrade urgency. This release fixes number of critical bugs in Write Ahead Log. It also adds support for advanced Java Serialization, which was reported many times as a bug.

Changes:

  • FIX Issue #17 - Serializer fails in some cases (writeExternal and readExternal methods)
  • FIX Issue #136 & #132 - Data corruption in Write Ahead Log after rollback or reopen.
  • FIX Issue #137 - Deadlock while closing AsyncWriteEngine Credit Jan Sileny
  • FIX Issue #139 - rolled back TX should not throw exception on close.
  • FIX Issue #135 - SerializerPojo registered classes problem. Credit Jan Sileny
  • ADD DBMaker.syncOnCommitDisable() parameter
  • ADD all stuff in DataOutput2 and DataInput2 is public. It also extends In/OutputStream now.

Version 0.9.2 (2013-05-19)

CRITICAL upgrade urgency. This release fixes some critical bugs. It also improves performance and introduces Data Pump.

Open Issues:

  • Issue #17 - Serializer fails in some cases (writeExternal and readExternal methods)

Changes:

  • FIX Issue #119 - BTreeMap did not released locks with multiple transactions
  • FIX Issue #125 - calling close twice failed.
  • FIX race condition in HTreeMap
  • ADD ByteBuffer now uses duplicate() instead of synchronization. Better concurrency
  • ADD Issue #123 - Replace RandomAccessFile by FileChannel and improve performance on 32bit systems.
  • ADD Delta Packing for tuples
  • ADD better serialization for small strings
  • ADD improve Javadoc, use Pegdown Doclet so Javadoc can be written in markdown
  • ADD reuse DataOutput instances, performance improvement
  • ADD datapump to create BTreeMap from large unsorted data set in linear time. Checkout Huge_Insert example
  • ADD improve AsyncWriteEngine performance by removing Write Queue

Version 0.9.1 (2013-04-14)

CRITICAL upgrade urgency. This release fixes number of critical bugs from first release, including data store corruption and crashes.

Open issues:

  • Issue #119 - BTreeMap (TreeMap) may not release all locks and consequently crash. This is unconfirmed and hard to replicate concurrent bug. I temporarily added assertion which slows down BTreeMap updates, but helps to diagnose this problem
  • Issue #118 - StoreWAL fails to create log for unknown reasons and crashes. Not reproduced yet, need to investigate.

Changes:

  • FIX #111 - Compaction fails with large data sets
  • FIX - BTreeKeySerializer.ZERO_OR_POSITIVE_INT was broken
  • FIX #89 - StoreAppend reopen failed
  • FIX #112 - Compaction fails with WAL enabled
  • FIX #114 - RandomAccessFile fails with WAL
  • FIX #113 - MemoryMappedFile was not unlocked on Windows after DB close
  • FIX - rewrite AsynwWriteEngine, fix many concurrent bugs
  • FIX - Files were not synced on DB.close(). Possible data loss.
  • FIX - free space reuse did not worked in StoreDirect and StoreWAL. Storage file grown infinitely with each update.
  • FIX #116 - HTreeMap.isEmpty returned wrong result.
  • FIX #121 - WAL could get corrupted in some cases.
  • ADD - basic benchmark
  • ADD - error message if file rename fails after compaction finishes
  • ADD - #119 BTreeMap locking could not be fixed, I added assertion to help diagnose issue. Small performance drop on BTreeMap updates.
  • ADD - performance improvement if Snapshot engine is not used.

Version 0.9.0 (2013-04-01)

First release with stable API and storage format.

Upgrade urgency levels:

  • LOW: No need to upgrade unless there are new features you want to use.
  • MODERATE: Program an upgrade of the DB engine, but it's not urgent.
  • HIGH: There is a critical bug that may affect a subset of users. Upgrade!
  • CRITICAL: There is a critical bug affecting MOST USERS. Upgrade ASAP.