[CARBONDATA-1478] Update compaction documentation In order to easier to understand, update the description about compaction.
This closes #1357 Project: http://git-wip-us.apache.org/repos/asf/carbondata/repo Commit: http://git-wip-us.apache.org/repos/asf/carbondata/commit/fe36e3bc Tree: http://git-wip-us.apache.org/repos/asf/carbondata/tree/fe36e3bc Diff: http://git-wip-us.apache.org/repos/asf/carbondata/diff/fe36e3bc Branch: refs/heads/branch-1.2 Commit: fe36e3bc979958cf94bcefaeaa651903017ce084 Parents: c257468 Author: xubo245 <601450...@qq.com> Authored: Wed Sep 13 20:24:40 2017 +0800 Committer: Jacky Li <jacky.li...@qq.com> Committed: Mon Sep 18 17:10:59 2017 +0800 ---------------------------------------------------------------------- docs/data-management.md | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) ---------------------------------------------------------------------- http://git-wip-us.apache.org/repos/asf/carbondata/blob/fe36e3bc/docs/data-management.md ---------------------------------------------------------------------- diff --git a/docs/data-management.md b/docs/data-management.md index 81866a1..b1a3eef 100644 --- a/docs/data-management.md +++ b/docs/data-management.md @@ -106,7 +106,7 @@ Example : CLEAN FILES FOR TABLE table1 ``` - This DML will physically delete the segment which are "Marked for delete" immediately. + This DML will physically delete the segment which are "Marked for delete" and "Compacted" immediately. ## Compacting Data @@ -135,7 +135,7 @@ CLEAN FILES FOR TABLE table1 | Parameter | Default | Application | Description | Valid Values | |-----------------------------------------|---------|-------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|--------------| -| carbon.compaction.level.threshold | 4, 3 | Minor | This property is for minor compaction which decides how many segments to be merged. Example: If it is set as 2, 3 then minor compaction will be triggered for every 2 segments. 3 is the number of level 1 compacted segment which is further compacted to new segment. | NA | +| carbon.compaction.level.threshold | 4, 3 | Minor | This property is for minor compaction which decides how many segments to be merged. Example: If it is set as "2, 3", then minor compaction will be triggered for every 2 segments in level 1. 3 is the number of level 1 compacted segment which is further compacted to new segment in level 2. | NA | | carbon.major.compaction.size | 1024 MB | Major | Major compaction size can be configured using this parameter. Sum of the segments which is below this threshold will be merged. | NA | | carbon.numberof.preserve.segments | 0 | Minor/Major | This property configures number of segments to preserve from being compacted. Example: carbon.numberof.preserve.segments=2 then 2 latest segments will always be excluded from the compaction. No segments will be preserved by default. | 0-100 | | carbon.allowed.compaction.days | 0 | Minor/Major | Compaction will merge the segments which are loaded within the specific number of days configured. Example: If the configuration is 2, then the segments which are loaded in the time frame of 2 days only will get merged. Segments which are loaded 2 days apart will not be merged. This is disabled by default. | 0-100 |
