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https://issues.apache.org/jira/browse/HBASE-5181?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13184472#comment-13184472
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Zhihong Yu commented on HBASE-5181:
-----------------------------------
Thanks for the suggestion, Mubarak.
Do you want to attach a patch ?
> Improve error message when Master fail-over happens and ZK unassigned node
> contains stale znode(s)
> --------------------------------------------------------------------------------------------------
>
> Key: HBASE-5181
> URL: https://issues.apache.org/jira/browse/HBASE-5181
> Project: HBase
> Issue Type: Bug
> Components: master
> Affects Versions: 0.92.0, 0.90.5
> Reporter: Mubarak Seyed
> Priority: Minor
> Labels: noob
>
> When master fail-over happens, if we have number of RITs under
> /hbase/unassigned and if we have stale znode(s) (encoded region names) under
> /hbase/unassigned, we are getting
> {code}
> 2011-12-30 10:27:35,623 INFO org.apache.hadoop.hbase.master.HMaster: Master
> startup proceeding: master failover
> 2011-12-30 10:27:36,002 INFO
> org.apache.hadoop.hbase.master.AssignmentManager: Failed-over master needs to
> process 1717 regions in transition
> 2011-12-30 10:27:36,004 FATAL org.apache.hadoop.hbase.master.HMaster:
> Unhandled exception. Starting shutdown.
> java.lang.ArrayIndexOutOfBoundsException: -256
> at
> org.apache.hadoop.hbase.executor.RegionTransitionData.readFields(RegionTransitionData.java:148)
>
> at org.apache.hadoop.hbase.util.Writables.getWritable(Writables.java:105)
> at org.apache.hadoop.hbase.util.Writables.getWritable(Writables.java:75)
> at
> org.apache.hadoop.hbase.executor.RegionTransitionData.fromBytes(RegionTransitionData.java:198)
>
> at org.apache.hadoop.hbase.zookeeper.ZKAssign.getData(ZKAssign.java:743)
> at
> org.apache.hadoop.hbase.master.AssignmentManager.processRegionInTransition(AssignmentManager.java:262)
>
> at
> org.apache.hadoop.hbase.master.AssignmentManager.processFailover(AssignmentManager.java:223)
>
> at
> org.apache.hadoop.hbase.master.HMaster.finishInitialization(HMaster.java:401)
> at org.apache.hadoop.hbase.master.HMaster.run(HMaster.java:283)
> {code}
> and there is no clue on how to clean-up the stale znode(s) from unassigned
> using zkCli.sh (del /hbase/unassigned/<bad region name>). It would be good if
> we include the bad region name in IOException from
> RegionTransitionData.readFields().
> {code}
> @Override
> public void readFields(DataInput in) throws IOException {
> // the event type byte
> eventType = EventType.values()[in.readShort()];
> // the timestamp
> stamp = in.readLong();
> // the encoded name of the region being transitioned
> regionName = Bytes.readByteArray(in);
> // remaining fields are optional so prefixed with boolean
> // the name of the regionserver sending the data
> if (in.readBoolean()) {
> byte [] versionedBytes = Bytes.readByteArray(in);
> this.origin = ServerName.parseVersionedServerName(versionedBytes);
> }
> if (in.readBoolean()) {
> this.payload = Bytes.readByteArray(in);
> }
> }
> {code}
> If the code execution has survived until regionName then we can include the
> regionName in IOException with error message to clean-up the stale znode(s)
> under /hbase/unassigned.
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