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Diffstat (limited to 'NEWS')
| -rw-r--r-- | NEWS | 47 |
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@@ -1,3 +1,50 @@ +WiredTiger release 2.0.0, 2013-12-11 +------------------------------------ + +The WiredTiger 2.0.0 release contains major new features, numerous performance +enhancements and bug fixes. + +Significant changes include: + +* WiredTiger now supports fine-grained durability via Write Ahead Logging (WAL). + Logging is enabled with the "log=(enabled)" configuration string to + wiredtiger_open. If the connection is not shut down cleanly and logging is + enabled, WiredTiger will automatically run recovery the next time it is + opened, rolling forward changes in the log until the last commit. + [#605] + +* Many enhancements to the LSM implementation to improve the throughput and + reduce maximum operation latency including: + - Algorithmic improvements when multiple merge threads are configured. + - Improvements to bloom filter lookup speed. + - Enhancements to internal cursor management, to reduce search overhead. + - Prioritize switching to a new level 0 chunk in utility threads, to avoid + application thread pauses. + - More advanced logic in choosing when to create bloom filters. + +* LSM specific WT_SESSION::create configuration option enhancements. Including: + - Move existing options into their own group, and strip leading lsm_ prefix. + - Add a new merge_max configuration option. + - Update the default chunk_size to be 10MB. + - Increase the default bloom filter bit and hash counts. + - Clean up files left after interrupted merges. + See the upgrading documentation for details. + [#784, #785, #786, #802] + +* WT_SESSION::compact can now be used to merge LSM trees into a small number + of chunks on disk. + [#792] + +* Enhanced the Java API, so that when WiredTiger automatically closes a + handle, the handle is automatically invalidated for the Java application. + [#485] + +* Add a script that can create an interactive web page to view statistics + from a WiredTiger statistics log. Based on D3: http://d3js.org/ + +* Enhancements to the wtperf performance testing tool to add new features + + WiredTiger release 1.6.6, 2013-11-19 ------------------------------------ |