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Diffstat (limited to 'NEWS')
| -rw-r--r-- | NEWS | 93 |
1 files changed, 51 insertions, 42 deletions
@@ -1,51 +1,56 @@ -WiredTiger release 2.5.0, 2014-12-23 +WiredTiger release 2.5.0, 2014-12-24 ------------------------------------ -The WiredTiger 2.4.0 release contains significant new features, API changes +The WiredTiger 2.5.0 release contains significant new features, API changes and many bug fixes. -Now that WiredTiger is part of MongoDB (yay) we are tracking issues related -to MongoDB usage of WiredTiger in the MongoDB JIRA system. Some entries in the -changelog now reference JIRA tickets that can be found at: -http://jira.mongodb.org +Now that WiredTiger is part of MongoDB, we are tracking issues related to +MongoDB usage of WiredTiger in the MongoDB JIRA system. Some entries in +the changelog now reference JIRA tickets that can be found at: + + http://jira.mongodb.org New features and API changes: * Add support for storing large values on-page in a btree rather than in - an overflow item. This is useful for workloads that want to keep large + an overflow item. This is useful for workloads that want to keep large items in cache - since WiredTiger overflow items are never cached. - Configured via new leaf_value_max configuration setting. This enhancement - led to the deprecation of internal_item_max and leaf_item_max configuration - settings, see upgrading documentation for further information. [#1282] + It is configured via new `leaf_value_max` configuration setting. This + enhancement led to the deprecation of internal_item_max and leaf_item_max + configuration settings, see upgrading documentation for further + information. [#1282] -* Add support for compressing log files. When configured each compressable log - record will be compressed. Supported via log=(compressor=X) configuration - setting. See upgrading documentation for further information. [#1359] +* Add support for compressing log files. When configured each compressable + log record will be compressed. This is configure with the + `log=(compressor=X)` configuration setting. See upgrading documentation + for further information. [#1359] * No longer return EBUSY when opening a bulk cursor, verifying or salvaging - a database if a checkpoint is currently running. Allowing applications - to do these operations while the checkpoint server is running. - [#1397] [#1404] SERVER-16236 SERVER-16457 + a database if a checkpoint is currently running. This allows + applications to do these exclusive operations without shutting down the + checkpoint server thread. [#1397] [#1404] SERVER-16236 SERVER-16457 * Add support for immutable indexes. [#1344] -* Added several new statistics field, improved accuracy for some statistics +* Added several new statistics, improved accuracy for some statistics tracking and simplified mechanism for querying a particular statistic. [#1505] * Have the eviction server write out unnecessary pages prior to the cache - reaching the configured eviction trigger size. This can reduce the amount of - eviction application threads do when configured with a large cache. + reaching the configured eviction trigger size. This can reduce the + amount of eviction application threads do when configured with a large + cache. * Several enhancements to managing how long we keep files open * Revert a change in the 2.4.1 release that caused the WT_ROLLBACK (and - deprecated WT_DEADLOCK) error return to map to a different numeric value. - Applications should ensure they are linking against the correct version of - the wiredtiger.h header file, otherwise odd behavior will be experienced. + deprecated WT_DEADLOCK) error return to map to different numeric values. + Applications should ensure they are compiling against the same version + of the wiredtiger.h header file as the library they link against, + otherwise odd behavior will be experienced. * Support setting configuration strings to "none" as being equivalent to an - empty string where it makes sense. [#1417] + empty string in most cases. [#1417] * Enhance the hot backup implementation to allow recovery to be run between incremental backups. [#1183] @@ -55,41 +60,45 @@ Other significant changes: * Improve performance of cursor open when there are many tables in a database. [#1391] [#1443] -* Reduce the impact checkpoints have on concurrent operations. This was done - by changing how we lock tables. [#1391] [#1392] +* Reduce the impact checkpoints have on concurrent operations. This was + done by changing how we lock tables. [#1391] [#1392] -* Improve performance when scanning a table that has many deleted items at - at the start of the range. SERVER-16247 +* Improve performance when scanning a table that has many deleted items. + SERVER-16247 * Fix a bug in checkpoint, where the metadata (turtle) file wasn't being synced on checkpoint. [#1383] -* Fix a bug where WiredTiger could accumulate memory, and never free it. - Related to tracking when threads may be traversing the index in an internal - page. SERVER-16546 +* Fix a bug where WiredTiger could accumulate memory during page splits and + never free it. SERVER-16546 * Many enhancements and bug fixes for Windows. -* Fix a bug where a custom extractor terminate was being called twice. [#1503] +* Fix a bug where a custom extractor terminate was being called twice. + [#1503] * Fix a bug where a race between closing a handle and checkpointing could lead to errors. [#1495] [#1497] * Validate the block header checksum before we clear it - if the checksum - field had been corrupted, we didn't notice. SERVER-16457 + field had been corrupted, we didn't notice. SERVER-16457 -* Fix a bug in write conflict detection. Cursors configured with no-overwrite - could sometimes not see update conflicts for deleted records. SERVER-16351 +* Fix a bug in write conflict detection. Cursors configured with + no-overwrite could sometimes not see update conflicts for deleted + records. SERVER-16351 * Several bug fixes and performance improvements in LSM including: - - Fix a bug in LSM search_near, where it return a deleted item. BF-694, BF-700 - - Improve background maintenance operation so that it doesn't fill the cache. - - Fix a bug that could lead to updates being written into old chunks. [#1432] [#1418] - - Fix a bug in background merge that could skip updates. SERVER-16123 + - Fix a bug in LSM search_near, where it return a deleted item. + BF-694, BF-700 + - Improve background maintenance operation so that it doesn't fill the + cache. + - Fix a bug that could lead to updates being written into old chunks. + [#1432] [#1418] + - Fix a bug in background merge that could skip updates. SERVER-16123 - Add support for custom collators in LSM trees. [#1361] -* Fix a bug when maintaining the cache, that could cause checkpoints to skip - writing an update that should have been included. [#1419] SERVER-16336 +* Fix a bug when maintaining the cache, that could cause checkpoints to + skip writing an update that should have been included. [#1419] SERVER-16336 * Fix a bug in WT_SESSION::drop, where failures generated error output even when force was specified. [#1436] @@ -104,8 +113,8 @@ Other significant changes: fcntl(F_FULLFSYNC) instead. * Work around a bug in clang 3.5.0 compare and swap primitive. The - __sync_bool_compare_and_swap version of the API in clang produces bad code - for us with -O3 optimization enabled. + __sync_bool_compare_and_swap version of the API in clang produces bad + code for us with -O3 optimization enabled. WiredTiger release 2.4.1, 2014-11-06 |