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From "mingjian (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-4762) ROOT and META region never be assigned if IOE throws in verifyRootRegionLocation
Date Wed, 09 Nov 2011 03:25:51 GMT
ROOT and META region never be assigned if IOE throws in verifyRootRegionLocation
--------------------------------------------------------------------------------

                 Key: HBASE-4762
                 URL: https://issues.apache.org/jira/browse/HBASE-4762
             Project: HBase
          Issue Type: Bug
          Components: master
    Affects Versions: 0.90.4
            Reporter: mingjian
            Assignee: mingjian
             Fix For: 0.94.0, 0.90.5


Patch in HBASE-3914 fixed root assigned in two regionservers. But it seemed like root region
will never be assigned if verifyRootRegionLocation throws IOE.
Like following master logs:
{noformat}
2011-10-19 19:13:34,873 ERROR org.apache.hadoop.hbase.executor.EventHandler: Caught throwable
while processing event M_META_SERVER_S
HUTDOWN
org.apache.hadoop.ipc.RemoteException: org.apache.hadoop.hbase.ipc.ServerNotRunningException:
Server is not running yet
        at org.apache.hadoop.hbase.ipc.HBaseServer$Handler.run(HBaseServer.java:1090)

        at org.apache.hadoop.hbase.ipc.HBaseClient.call(HBaseClient.java:771)
        at org.apache.hadoop.hbase.ipc.HBaseRPC$Invoker.invoke(HBaseRPC.java:256)
        at $Proxy7.getRegionInfo(Unknown Source)
        at org.apache.hadoop.hbase.catalog.CatalogTracker.verifyRegionLocation(CatalogTracker.java:424)
        at org.apache.hadoop.hbase.catalog.CatalogTracker.verifyRootRegionLocation(CatalogTracker.java:471)
        at org.apache.hadoop.hbase.master.handler.ServerShutdownHandler.verifyAndAssignRoot(ServerShutdownHandler.java:90)
        at org.apache.hadoop.hbase.master.handler.ServerShutdownHandler.process(ServerShutdownHandler.java:126)
        at org.apache.hadoop.hbase.executor.EventHandler.run(EventHandler.java:151)
        at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
        at java.lang.Thread.run(Thread.java:662)
{noformat}
After this, -ROOT-'s region won't be assigned, like this:
{noformat}
2011-10-19 19:18:40,000 DEBUG org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation:
locateRegionInMeta parent
Table=-ROOT-, metaLocation=address: dw79.kgb.sqa.cm4:60020, regioninfo: -ROOT-,,0.70236052,
attempt=0 of 10 failed; retrying after s
leep of 1000 because: org.apache.hadoop.hbase.NotServingRegionException: Region is not online:
-ROOT-,,0
        at org.apache.hadoop.hbase.regionserver.HRegionServer.getRegion(HRegionServer.java:2771)
        at org.apache.hadoop.hbase.regionserver.HRegionServer.getClosestRowBefore(HRegionServer.java:1802)
        at sun.reflect.GeneratedMethodAccessor7.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.HBaseRPC$Server.call(HBaseRPC.java:569)
        at org.apache.hadoop.hbase.ipc.HBaseServer$Handler.run(HBaseServer.java:1091)
{noformat}
So we should rewrite the verifyRootRegionLocation method.

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