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Diffstat (limited to 'src/third_party/wiredtiger/src/docs/upgrading.dox')
| -rw-r--r-- | src/third_party/wiredtiger/src/docs/upgrading.dox | 41 |
1 files changed, 37 insertions, 4 deletions
diff --git a/src/third_party/wiredtiger/src/docs/upgrading.dox b/src/third_party/wiredtiger/src/docs/upgrading.dox index c5fbc0a86a2..3a448818230 100644 --- a/src/third_party/wiredtiger/src/docs/upgrading.dox +++ b/src/third_party/wiredtiger/src/docs/upgrading.dox @@ -2,12 +2,45 @@ @section version_281 Upgrading to Version 2.8.1 <dl> +<dt>Cache management defaults</dt> +<dd> +The default values for the \c eviction_dirty_target and \c +eviction_dirty_trigger settings to ::wiredtiger_open have changed to 5 and 20, +respectively. This means that by default, WiredTiger will start writing dirty +pages from cache when it becomes 5% dirty and will throttle activity to keep +the volume of dirty data in cache under 20%. For write-heavy workloads, the +new defaults may result in lower throughput and more threads writing to data +files concurrently. + +There is also a new \c eviction_checkpoint_target setting that determines +how much work is done at the beginning of a checkpoint to make the critical +section of checkpoints complete more quickly. +</dd> + +<dt>Checkpoint server created checkpoint names</dt> +<dd> +The ::wiredtiger_open checkpoint configuration no longer supports the +\c name configuration, and checkpoint server created checkpoints will +always be named the default WiredTiger checkpoint name, +"WiredTigerCheckpoint". Applications depending on the ability to set the +checkpoint name for the checkpoint server will require modification. +</dd> + <dt>Statistics logging path</dt> <dd> -The statistics logging path configuration has been simplified to be only a -path to a directory, and the file name component of the path may no longer -be specified. Applications depending on the ability to set statistics log -file names will require modifications. +The ::wiredtiger_open statistics logging path configuration has been +simplified to be only a path to a directory, and the file name component +of the path may no longer be specified. Applications depending on the +ability to set statistics log file names will require modification. +</dd> + +<dt>Deprecated statistics field</dt> +<dd> +The connection statistic \c WT_STAT_CONN_CACHE_BYTES_OVERFLOW has been +removed. Overflow information is now available in the +\c WT_STAT_CONN_CACHE_BYTES_OVERFLOW and \c WT_STAT_CONN_CACHE_OVERFLOW_VALUE. +Applications specifically looking for that statistic will require +modification. </dd> </dl><hr> |