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From "Jingcheng Du (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-15381) Implement a distributed MOB compaction by procedure
Date Thu, 21 Apr 2016 03:55:25 GMT

    [ https://issues.apache.org/jira/browse/HBASE-15381?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15251208#comment-15251208
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Jingcheng Du commented on HBASE-15381:
--------------------------------------

Right. the length of the encoded name is known. It is a MD5 of the region name, it is similar
with what is used in MOB now (MD5 of a start key).
Do we need to replace it?

> Implement a distributed MOB compaction by procedure
> ---------------------------------------------------
>
>                 Key: HBASE-15381
>                 URL: https://issues.apache.org/jira/browse/HBASE-15381
>             Project: HBase
>          Issue Type: Improvement
>          Components: mob
>            Reporter: Jingcheng Du
>            Assignee: Jingcheng Du
>         Attachments: HBASE-15381.patch, mob distributed compaction design-v2.pdf, mob
distributed compaction design.pdf
>
>
> In MOB, there is a periodical compaction which runs in HMaster (It can be disabled by
configuration), some small mob files are merged into bigger ones. Now the compaction only
runs in HMaster which is not efficient and might impact the running of HMaster. In this JIRA,
a distributed MOB compaction is introduced, it is triggered by HMaster, but all the compaction
jobs are distributed to HRegionServers.



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