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https://issues.apache.org/jira/browse/HBASE-6089?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13282582#comment-13282582
]
ramkrishna.s.vasudevan commented on HBASE-6089:
-----------------------------------------------
{code}
2012-05-24 19:26:02,493 DEBUG org.apache.hadoop.hbase.master.ServerManager: New
connection to linux146,60020,1337867810895
2012-05-24 19:26:02,552 DEBUG org.apache.hadoop.hbase.master.AssignmentManager:
Handling transition=RS_ZK_REGION_OPENING, server=linux146,60020,1337867810895,
region=2be5ef20db58b775953cc1107eb51d2d
2012-05-24 19:26:02,592 DEBUG org.apache.hadoop.hbase.master.AssignmentManager:
Handling transition=RS_ZK_REGION_OPENING, server=linux146,60020,1337867810895,
region=191b0c97f2d2a8262bf790093fdce2ab
2012-05-24 19:26:02,595 DEBUG org.apache.hadoop.hbase.master.AssignmentManager:
Handling transition=RS_ZK_REGION_OPENING, server=linux146,60020,1337867810895,
region=99d462b47ea5e301175d025204eff014
2012-05-24 19:26:03,957 DEBUG org.apache.hadoop.hbase.master.AssignmentManager:
Bulk assigning done for linux146,60020,1337867810895
2012-05-24 19:26:14,640 DEBUG org.apache.hadoop.hbase.master.AssignmentManager:
Handling transition=RS_ZK_REGION_OPENING, server=linux146,60020,1337867810895,
region=2be5ef20db58b775953cc1107eb51d2d
2012-05-24 19:26:14,781 DEBUG org.apache.hadoop.hbase.master.AssignmentManager:
Handling transition=RS_ZK_REGION_OPENED, server=linux146,60020,1337867810895,
region=2be5ef20db58b775953cc1107eb51d2d
2012-05-24 19:26:14,785 DEBUG
org.apache.hadoop.hbase.master.handler.OpenedRegionHandler: Handling OPENED
event for et1,,1337864575331.2be5ef20db58b775953cc1107eb51d2d. from
linux146,60020,1337867810895; deleting unassigned node
2012-05-24 19:26:14,786 DEBUG org.apache.hadoop.hbase.zookeeper.ZKAssign:
master:60000-0x1377ea1a1fe002d Deleting existing unassigned node for
2be5ef20db58b775953cc1107eb51d2d that is in expected state RS_ZK_REGION_OPENED
2012-05-24 19:26:14,792 DEBUG org.apache.hadoop.hbase.zookeeper.ZKAssign:
master:60000-0x1377ea1a1fe002d Successfully deleted unassigned node for region
2be5ef20db58b775953cc1107eb51d2d in expected state RS_ZK_REGION_OPENED
2012-05-24 19:26:14,792 DEBUG org.apache.hadoop.hbase.master.AssignmentManager:
Handling transition=RS_ZK_REGION_OPENING, server=linux146,60020,1337867810895,
region=5a84a4f4eaf2519e36a8ccc2e9c83b04
2012-05-24 19:26:14,792 DEBUG org.apache.hadoop.hbase.master.AssignmentManager:
The znode of region et1,,1337864575331.2be5ef20db58b775953cc1107eb51d2d. has
been deleted.
2012-05-24 19:26:23,862 INFO
org.apache.hadoop.hbase.master.handler.ServerShutdownHandler: Finished
processing of shutdown of linux146,60020,1337866620614
2012-05-24 19:26:51,927 FATAL org.apache.hadoop.hbase.master.HMaster: Master
server abort: loaded coprocessors are: []
2012-05-24 19:26:51,931 FATAL org.apache.hadoop.hbase.master.HMaster: Unhandled
exception. Starting shutdown.
java.util.ConcurrentModificationException
at java.util.TreeMap$PrivateEntryIterator.nextEntry(TreeMap.java:1100)
at java.util.TreeMap$EntryIterator.next(TreeMap.java:1136)
at java.util.TreeMap$EntryIterator.next(TreeMap.java:1131)
at
org.apache.hadoop.hbase.master.AssignmentManager.processDeadServersAndRegionsInTransition(AssignmentManager.java:409)
at
org.apache.hadoop.hbase.master.AssignmentManager.joinCluster(AssignmentManager.java:363)
at
org.apache.hadoop.hbase.master.HMaster.finishInitialization(HMaster.java:607)
at org.apache.hadoop.hbase.master.HMaster.run(HMaster.java:374)
at java.lang.Thread.run(Thread.java:662)
{code}
> SSH and AM.joinCluster causes Concurrent Modification exception.
> ----------------------------------------------------------------
>
> Key: HBASE-6089
> URL: https://issues.apache.org/jira/browse/HBASE-6089
> Project: HBase
> Issue Type: Bug
> Affects Versions: 0.92.1, 0.94.0
> Reporter: ramkrishna.s.vasudevan
> Fix For: 0.90.7, 0.92.2, 0.96.0, 0.94.1
>
>
> AM.regions map is parallely accessed in SSH and Master initialization leading
> to ConcurrentModificationException.
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