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From "Jingcheng Du (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-11644) External MOB compaction tools
Date Fri, 19 Sep 2014 09:18:34 GMT

     [ https://issues.apache.org/jira/browse/HBASE-11644?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jingcheng Du updated HBASE-11644:
---------------------------------
    Attachment: HBASE-11644-Sep-19.diff

Update the patch based on the patch in "handle mob in compaction".

> External MOB compaction tools
> -----------------------------
>
>                 Key: HBASE-11644
>                 URL: https://issues.apache.org/jira/browse/HBASE-11644
>             Project: HBase
>          Issue Type: Sub-task
>          Components: Compaction, master
>    Affects Versions: hbase-11339
>            Reporter: Jingcheng Du
>            Assignee: Jingcheng Du
>             Fix For: hbase-11339
>
>         Attachments: HBASE-11644-Sep-15.diff, HBASE-11644-Sep-16.diff, HBASE-11644-Sep-16.diff,
HBASE-11644-Sep-18.diff, HBASE-11644-Sep-19.diff, HBASE-11644.diff, HBASE-11646-0918-bad.patch
>
>
> From the design doc,  mob files are not involved in the normal HBase compaction process.
 This means deleted mobs would still take up space and that we never really merge mob files
that accrue over time.   Currently, MOBs depend on two external tools:
> 1) A TTL cleaner that removes mobs that have passed their TTL or exceeded minVersions.
> 2) A 'sweep tool' cleaner that remove mobs that have had their references deleted and
merges small files into larger ones.  
> Today the tools are triggered by admins.  The longer term goal would be to integrate
them into hbase such that by default mobs are cleaned.  The tools will be preserved however
so that advanced admins can disable automatic cleanups and manually trigger these compaction
like operaitons.  #1 would likely be a chore in the master while #2 requires some design work
to integrate into hbase.



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