diff options
Diffstat (limited to 'NEWS')
| -rw-r--r-- | NEWS | 65 |
1 files changed, 35 insertions, 30 deletions
@@ -65,8 +65,8 @@ Significant bug fixes and performance enhancements: page if we are attempting to split it. refs WT-1916, WT-1917 -* Fix a bug in btree open where if there was a failure while opening at a - checkpoint, the checkpoint may not be unloaded. +* Fix a bug in btree open where a failure while opening a checkpoint we may + not clean up completely. refs WT-1598 * Fix a performance problem where long running transactions could continually @@ -74,68 +74,73 @@ Significant bug fixes and performance enhancements: of finding any. refs WT-1913 -* Move eviction outside transactions and don't start a transaction when reading a page if eviction is prohibited. +* Fix a performance problem where many threads accessing a single page could + stop us from evicting or splitting the page. refs WT-1912 -* Restructure handle locking so it all happens at the session level, avoid entanglements between handle locks, the schema lock and the handle list lock. +* Fix a source of deadlock bugs by resturcturing how we lock handles. Clean + up the definition of when it is safe to acquire different locks. refs WT-1598 -* Ensure that a file marked as cache resident is never evicted, add some optimizations for cache resident files. +* Fix a bug where we could evict pages from a file marked as cache resident. + Also add some optimizations for cache resident files. refs SERVER-18192 -* Fix a deadlock related to LSM. There are cases where closing a file with an existing checkpoint could self deadlock. +* Fix a deadlock related to LSM. There are cases where closing a file with an + existing checkpoint could self deadlock. refs WT-716 -* Run recovery earlier. TODO: more information - WT-1897 - -* Only split large in-memory pages if there is a need to keep them in cache. Otherwise it is better to reconcile and evict them immediately. +* Only split large in-memory pages if there is a need to keep them in cache. + Otherwise it is better to reconcile and evict them immediately. refs WT-1890 WT-1896 -* Shut down the eviction server before closing file handles to avoid a race. +* Fix a race on shutdown where the eviction server could still have been + accessing files while they were being closed. refs WT-1893 -* Look for any number of non-data-changing log records to determine if we can skip recovery. +* Fix a case where we could run recovery unnecessarily if there were only non + data changing log records since the last checkpoint. WT-1892 -* Update API documentation to explain internal session handle usage. This allows users to do specific calculations based on their session_max setting. +* Update API documentation to explain internal session handle usage. This + allows users to do specific calculations based on their session_max setting. * Fix a bug in LSM where updates with overwrite could be skipped incorrectly. refs BF-829 -* Fix a bug in cursors where searching and traversing in different combinations could lead to data buffers being freed before they should be. +* Fix a bug in cursors where searching and traversing in different combinations + could lead to data buffers being freed before they should be. refs WT-1887 * Fix a bug when closing bulk cursors where a file could be left pinned open. -* Generated tables for config subcategories now contains the name of the method they are applicable for. TODO: This is an API change, find details. - refs WT-1879 - -* Disable fallocate on Windows since SetEndofFile does not ignore truncation requests like POSIX fallocate. +* Fix a bug on Windows related to truncating files. Since SetEndofFile does not + ignore truncation requests like POSIX fallocate. -* Fix a bug in file truncate, where we could truncate to the wrong place if there was a race extending the file at the same time. +* Fix a bug in file truncate, where we could truncate to the wrong place if + there was a race extending the file at the same time. refs WT-1871 -* Fix a bug in reconciliation where the page boundary structures could point into freed memory. +* Fix a bug in reconciliation where the page boundary structures could point + into freed memory. refs WT-1852 -* Change the WT_CURSOR::search and WT_CURSOR::search_near API to first check the currently pinned page before starting a regular descending search. +* Change the WT_CURSOR::search and WT_CURSOR::search_near API to first check + the currently pinned page before starting a regular descending search. -* Reset eol if we continue. Return NOTFOUND if checksum mismatch. #1840 - commit 684fd71475cbc6b15290945af0160fac0313ad6b +* Fix a bug in recovery where we could return an error if a transaction spanned + an entire log file. -* Modify log_scan callback args to send in next LSN. #1837 TODO: API change? - commit 9c29e0f13268c03038704372c069353c81357791 +* Fix a bug where we could run recovery unnecessarily on startup. * Enhance the Python cursor API to allow setting keys and values using array notation. -* The gaps in column-store tables can be large enough we spend too much time looping through the "deleted" records when writing out the page skip the boring part. +* Fix a performance problem where creating a column store with large gaps in + the key range would lead to very poor performance. refs WT-1807. -* Set checkpoint LSN to existing log record. - refs WT-1700 - -* Update the btree search routine to use vectorized search. Based on CPU and memory profiling. +* Improve the performance of the core btree search routine by using a + vectorized search. Based on CPU and memory profiling. WiredTiger release 2.5.3, 2015-04-22 |