ROOT and META region never be assigned if IOE throws in verifyRootRegionLocation
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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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