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From "stack (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HBASE-1082) Administrative functions for table/region maintenance
Date Mon, 05 Jan 2009 23:59:44 GMT

     [ https://issues.apache.org/jira/browse/HBASE-1082?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

stack updated HBASE-1082:

    Attachment: 1082.patch

First crack at this functionality.  Adds flush and major compaction to shell.  Also added
compact and split to the hbase shell while I was at it:

hbase(main):003:0> tools
 close_region    Close a single region. Optionally specify regionserver.
                 hbase> close_region 'REGIONNAME'
                 hbase> close_region 'REGIONNAME', 'REGIONSERVER_IP:PORT'

 disable_region  Disable a single region

 enable_region   Enable a single region. For example,
                 hbase> enable_region 'REGIONNAME'
 flush           Flush all regions in passed table or pass a region row to
                 flush an individual region

                 hbase> flush 'TABLENAME'
                 hbase> flush 'REGIONNAME'

 compact         Compact all regions in passed table or pass a region row
                 to compact an individual region

 major_compact   Run major compaction on passed table or pass a region row
                 to major compact an individual region

 split           Split table or pass a region row to split individual region

Above commands are for 'experts'-only as misuse can damage an install

> 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
>             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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