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From "stack (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-1082) Administrative functions for table/region maintenance
Date Tue, 06 Jan 2009 00:01:44 GMT

    [ https://issues.apache.org/jira/browse/HBASE-1082?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12660992#action_12660992

stack commented on HBASE-1082:

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
> 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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