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https://issues.apache.org/jira/browse/HBASE-1082?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12660992#action_12660992
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stack commented on HBASE-1082:
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Needs a load of testing. Doing that now.
> Administrative functions for table/region maintenance
> -----------------------------------------------------
>
> Key: HBASE-1082
> URL: https://issues.apache.org/jira/browse/HBASE-1082
> Project: Hadoop HBase
> Issue Type: New Feature
> Affects Versions: 0.19.0
> Reporter: Jonathan Gray
> Assignee: stack
> Fix For: 0.19.0
>
> Attachments: 1082.patch
>
>
> It would be useful to have some administrative functions available through
> HTable or HBaseAdmin. The two functions I'm thinking of right now are to
> force memcache flushes (on all regions, or individually specified) and to run
> major compactions (on all regions, or individually specified).
> One reason to have this is currently major compactions run once a day by
> default. The time that they run is related to when you brought up your
> cluster or created the tables. In my case, this has been during peak load
> rather than offpeak times. We have times that we run other administrative
> tasks like backups, cleanup, etc... during off times, and this would be a
> good time to also trigger major compactions and memcache flushes.
> Memcache force flushing can also be useful in the case that your cluster
> starts to have issues. They might be isolated to a single region or
> regionserver, but with lots of edits sitting in memcache and potentially
> unappended hlogs, you want to just flush things out to remove the possibility
> of losing anything.
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