[HBASE-4340] Hbase can't balance if ServerShutdownHandler encountered exception

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.90.4
• Fix Version/s: 0.90.5
• Hadoop Flags: Reviewed
• Assignee: gaojinchao
• Reporter: gaojinchao
• Created: 07/Sep/11 02:26
• Updated: 20/Nov/15 11:53
• Resolved: 10/Sep/11 04:39

Description

Version: 0.90.4
Cluster : 40 boxes
As I saw below logs. It said that balance couldn't work because of a dead RS.
I dug deeply and found two issues:

1. shutdownhandler didn't clear numProcessing deal with some exceptions. It seems whatever exceptions we should clear the flag or close master.

2. "dead regionserver(s): [158-1-130-12,20020,1314971097929]" is inaccurate. The dead sever should be " 158-1-130-10,20020,1315068597979"

//master logs:
2011-09-05 00:28:00,487 DEBUG org.apache.hadoop.hbase.master.HMaster: Not running balancer because processing dead regionserver(s): [158-1-130-12,20020,1314971097929]
2011-09-05 00:33:00,489 DEBUG org.apache.hadoop.hbase.master.HMaster: Not running balancer because processing dead regionserver(s): [158-1-130-12,20020,1314971097929]
2011-09-05 00:38:00,493 DEBUG org.apache.hadoop.hbase.master.HMaster: Not running balancer because processing dead regionserver(s): [158-1-130-12,20020,1314971097929]
2011-09-05 00:43:00,495 DEBUG org.apache.hadoop.hbase.master.HMaster: Not running balancer because processing dead regionserver(s): [158-1-130-12,20020,1314971097929]
2011-09-05 00:48:00,499 DEBUG org.apache.hadoop.hbase.master.HMaster: Not running balancer because processing dead regionserver(s): [158-1-130-12,20020,1314971097929]
2011-09-05 00:53:00,501 DEBUG org.apache.hadoop.hbase.master.HMaster: Not running balancer because processing dead regionserver(s): [158-1-130-12,20020,1314971097929]
2011-09-05 00:58:00,501 DEBUG org.apache.hadoop.hbase.master.HMaster: Not running balancer because processing dead regionserver(s): [158-1-130-12,20020,1314971097929]
2011-09-05 01:03:00,502 DEBUG org.apache.hadoop.hbase.master.HMaster: Not running balancer because processing dead regionserver(s): [158-1-130-12,20020,1314971097929]
2011-09-05 01:08:00,506 DEBUG org.apache.hadoop.hbase.master.HMaster: Not running balancer because processing dead regionserver(s): [158-1-130-12,20020,1314971097929]
2011-09-05 01:13:00,508 DEBUG org.apache.hadoop.hbase.master.HMaster: Not running balancer because processing dead regionserver(s): [158-1-130-12,20020,1314971097929]
2011-09-05 01:18:00,512 DEBUG org.apache.hadoop.hbase.master.HMaster: Not running balancer because processing dead regionserver(s): [158-1-130-12,20020,1314971097929]
2011-09-05 01:23:00,514 DEBUG org.apache.hadoop.hbase.master.HMaster: Not running balancer because processing dead regionserver(s): [158-1-130-12,20020,1314971097929]
2011-09-05 01:28:00,518 DEBUG org.apache.hadoop.hbase.master.HMaster: Not running balancer because processing dead regionserver(s): [158-1-130-12,20020,1314971097929]
2011-09-05 01:33:00,520 DEBUG org.apache.hadoop.hbase.master.HMaster: Not running balancer because processing dead regionserver(s): [158-1-130-12,20020,1314971097929]
2011-09-05 01:38:00,524 DEBUG org.apache.hadoop.hbase.master.HMaster: Not running balancer because processing dead regionserver(s): [158-1-130-12,20020,1314971097929]
2011-09-05 01:43:00,526 DEBUG org.apache.hadoop.hbase.master.HMaster: Not running balancer because processing dead regionserver(s): [158-1-130-12,20020,1314971097929]
2011-09-05 01:48:00,530 DEBUG org.apache.hadoop.hbase.master.HMaster: Not running balancer because processing dead regionserver(s): [158-1-130-12,20020,1314971097929]
2011-09-05 01:53:00,532 DEBUG org.apache.hadoop.hbase.master.HMaster: Not running balancer because processing dead regionserver(s): [158-1-130-12,20020,1314971097929]
2011-09-05 01:58:00,536 DEBUG org.apache.hadoop.hbase.master.HMaster: Not running balancer because processing dead regionserver(s): [158-1-130-12,20020,1314971097929]
2011-09-05 02:03:00,537 DEBUG org.apache.hadoop.hbase.master.HMaster: Not running balancer because processing dead regionserver(s): [158-1-130-12,20020,1314971097929]
2011-09-05 02:08:00,538 DEBUG org.apache.hadoop.hbase.master.HMaster: Not running balancer because processing dead regionserver(s): [158-1-130-12,20020,1314971097929]
2011-09-05 02:13:00,539 DEBUG org.apache.hadoop.hbase.master.HMaster: Not running balancer because processing dead regionserver(s): [158-1-130-12,20020,1314971097929]
2011-09-05 02:18:00,543 DEBUG org.apache.hadoop.hbase.master.HMaster: Not running balancer because processing dead regionserver(s): [158-1-130-12,20020,1314971097929]

// the exception logs :.
2011-09-03 18:13:27,550 DEBUG org.apache.hadoop.hbase.master.AssignmentManager: Handling transition=RS_ZK_REGION_OPENING, server=158-1-133-11,20020,1315069437236, region=0db4088d75c58dd22f93f389d90ba6cc
2011-09-03 18:13:27,550 ERROR org.apache.hadoop.hbase.executor.EventHandler: Caught throwable while processing event M_SERVER_SHUTDOWN java.lang.NullPointerException
at org.apache.hadoop.hbase.util.Bytes.toLong(Bytes.java:480)
at org.apache.hadoop.hbase.util.Bytes.toLong(Bytes.java:454)
at org.apache.hadoop.hbase.catalog.MetaReader.metaRowToRegionPairWithInfo(MetaReader.java:400)
at org.apache.hadoop.hbase.catalog.MetaReader.getServerUserRegions(MetaReader.java:591)
at org.apache.hadoop.hbase.master.handler.ServerShutdownHandler.process(ServerShutdownHandler.java:176)
at org.apache.hadoop.hbase.executor.EventHandler.run(EventHandler.java:156)
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)
2011-09-03 18:13:27,550 INFO org.apache.hadoop.hbase.master.handler.ServerShutdownHandler: Splitting logs for 158-1-134-15,20020,1315065238916
2011-09-03 18:13:27,566 DEBUG org.apache.hadoop.hbase.master.AssignmentManager: No previous transition plan was found (or we are ignoring an existing plan) for ufdr,001146,1314955304624.22f6d43e78c903196f206881fc149488. so generated a random one; hri=ufdr,001146,1314955304624.22f6d43e78c903196f206881fc149488., src=, dest=158-1-132-17,20020,1315069441916; 31 (online=31, exclude=null) available servers
201