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From "Nick Dimiduk (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-8803) region_mover.rb should move multiple regions at a time
Date Thu, 11 Jul 2013 22:27:48 GMT

    [ https://issues.apache.org/jira/browse/HBASE-8803?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13706349#comment-13706349
] 

Nick Dimiduk commented on HBASE-8803:
-------------------------------------

For instance, here's a recent run of {{time /usr/lib/hbase/bin/rolling-restart.sh --rs-only
--graceful}} on this cluster of 9 RS's that took 30+ minutes.

{noformat}
13/07/10 23:49:33 INFO region_mover: Moving region 1028785192 (1 of 1) to server=XXXXXX,60020,1373499860198
NativeException: org.apache.hadoop.hbase.NotServingRegionException: org.apache.hadoop.hbase.NotServingRegionException:
Region is not online: -ROOT-,,0
        at org.apache.hadoop.hbase.regionserver.HRegionServer.getRegion(HRegionServer.java:3491)
        at org.apache.hadoop.hbase.regionserver.HRegionServer.getClosestRowBefore(HRegionServer.java:2186)
        at sun.reflect.GeneratedMethodAccessor29.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at org.apache.hadoop.hbase.ipc.WritableRpcEngine$Server.call(WritableRpcEngine.java:340)
        at org.apache.hadoop.hbase.ipc.HBaseServer$Handler.run(HBaseServer.java:1426)

          getTable at /usr/lib/hbase/bin/region_mover.rb:74
  isSuccessfulScan at /usr/lib/hbase/bin/region_mover.rb:133
     unloadRegions at /usr/lib/hbase/bin/region_mover.rb:350
              call at org/jruby/RubyProc.java:270
              call at org/jruby/RubyProc.java:224
{noformat}

As far as I can tell, the ROOT region was never unavailable; I think it's a race condition
in AM.
                
> region_mover.rb should move multiple regions at a time
> ------------------------------------------------------
>
>                 Key: HBASE-8803
>                 URL: https://issues.apache.org/jira/browse/HBASE-8803
>             Project: HBase
>          Issue Type: Bug
>          Components: Usability
>    Affects Versions: 0.98.0, 0.94.8, 0.95.1
>            Reporter: Jean-Marc Spaggiari
>            Assignee: Jean-Marc Spaggiari
>             Fix For: 0.98.0, 0.95.2, 0.94.10
>
>         Attachments: HBASE-8803-v0-trunk.patch, HBASE-8803-v1-0.94.patch, HBASE-8803-v1-trunk.patch,
HBASE-8803-v2-0.94.patch, HBASE-8803-v2-0.94.patch
>
>   Original Estimate: 48h
>  Remaining Estimate: 48h
>
> When there is many regions in a cluster, rolling_restart can take hours because region_mover
is moving the regions one by one.

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