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From "Anoop Sam John (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-18056) Change CompactingMemStore in BASIC mode to merge multiple segments in pipeline
Date Tue, 16 May 2017 14:27:04 GMT

    [ https://issues.apache.org/jira/browse/HBASE-18056?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16012473#comment-16012473
] 

Anoop Sam John commented on HBASE-18056:
----------------------------------------

Will need many rounds of perf test before doing this.  With and with out MSLAB and pool (All
possible options that we give).. Already I have an issue with MSLAB pool and high IHOP. (mentioned
details and possible cause in another jira). The merge will make the situation worse there.
Will do more tests around this. Already doing some.

> Change CompactingMemStore in BASIC mode to merge multiple segments in pipeline
> ------------------------------------------------------------------------------
>
>                 Key: HBASE-18056
>                 URL: https://issues.apache.org/jira/browse/HBASE-18056
>             Project: HBase
>          Issue Type: Sub-task
>            Reporter: Anastasia Braginsky
>
> Under HBASE-16417 it was decided that CompactingMemStore in BASIC mode should merge multiple
ImmutableSegments in CompactionPipeline. Basic+Merge actually demonstrated reduction in GC,
alongside improvement in other metrics.
> However, the limit on the number of segments in pipeline is still set to 30. Under this
JIRA it should be changed to 1, as it was tested under HBASE-16417.



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