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From "Anastasia Braginsky (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-17765) Reviving the merge possibility in the CompactingMemStore
Date Wed, 15 Mar 2017 09:54:41 GMT

    [ https://issues.apache.org/jira/browse/HBASE-17765?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15925820#comment-15925820
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Anastasia Braginsky commented on HBASE-17765:
---------------------------------------------

I am going to upload patch later with other changes.

closeSuffix and updateRegionSize booleans are not logically related. 
closeSuffix is saying whether to close the MSLABs of the removed segments (shouldn't be done
for merge)
updateRegionSize is saying whether to inform the region about the size change (shouldn't be
done on snapshot, before snapshot fully flushed to disk)

> Reviving the merge possibility in the CompactingMemStore
> --------------------------------------------------------
>
>                 Key: HBASE-17765
>                 URL: https://issues.apache.org/jira/browse/HBASE-17765
>             Project: HBase
>          Issue Type: Sub-task
>            Reporter: Anastasia Braginsky
>            Assignee: Anastasia Braginsky
>             Fix For: 2.0.0
>
>         Attachments: HBASE-17765-V01.patch
>
>
> According to the new performance results presented in the HBASE-16417 we see that the
read latency of the 90th percentile of the BASIC policy is too big due to the need to traverse
through too many segments in the pipeline. In this JIRA we correct the bug in the merge sizing
calculations and allow pipeline size threshold to be a configurable parameter.



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