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From "Jean-Marc Spaggiari (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-8912) [0.94] AssignmentManager throws IllegalStateException from PENDING_OPEN to OFFLINE
Date Sun, 29 Dec 2013 16:47:51 GMT

    [ https://issues.apache.org/jira/browse/HBASE-8912?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13858370#comment-13858370
] 

Jean-Marc Spaggiari commented on HBASE-8912:
--------------------------------------------

Sorry, I was off yesterday for the family Christmas party ;) Master is down again this morning.
Tried to restart it, went well.

I will capture the related ZNode state next time he goes down. Should not be that long. The
cultprit region this morning was from a table where snappy is enabled.

Ok, just retried the balancer, crashed instantaneously 

Details of the culprit region in ZK:
{code}
[zk: localhost:2181(CONNECTED) 4] get /hbase/unassigned/0b7c5e8c99e6a5f2039efed16b30ff9e
�
 23767@node8 C?;k�~page,ac.topsgolb.sthguohtsrebruht.www http -1 /search/label/smoking%20ban
null,1381226128817.0b7c5e8c99e6a5f2039efed16b30ff9e. *node8.distparser.com,60020,1388184406449
cZxid = 0x59000abf87
ctime = Sun Dec 29 11:41:30 EST 2013
mZxid = 0x59000abffa
mtime = Sun Dec 29 11:41:32 EST 2013
pZxid = 0x59000abf87
cversion = 0
dataVersion = 8
aclVersion = 0
ephemeralOwner = 0x0
dataLength = 198
numChildren = 0
{code}

And the logs
{code}
2013-12-29 11:41:34,149 DEBUG org.apache.hadoop.hbase.master.handler.ClosedRegionHandler:
Handling CLOSED event for 5e5bce123f3b37ca062763683383c858
2013-12-29 11:41:34,170 DEBUG org.apache.hadoop.hbase.master.handler.ClosedRegionHandler:
Handling CLOSED event for 1d7aa3a9b29ee9ce2d58b1b73cfc5543
2013-12-29 11:41:34,201 DEBUG org.apache.hadoop.hbase.master.handler.ClosedRegionHandler:
Handling CLOSED event for 42fa0cb7de3ecf237bcf31b5e766f630
2013-12-29 11:41:34,214 DEBUG org.apache.hadoop.hbase.master.handler.ClosedRegionHandler:
Handling CLOSED event for 2a89feb2b068391ddf22a9066297d070
2013-12-29 11:41:34,262 DEBUG org.apache.hadoop.hbase.master.handler.ClosedRegionHandler:
Handling CLOSED event for 136e765b38663cdcc682ecff3d3e83f8
2013-12-29 11:41:34,325 DEBUG org.apache.hadoop.hbase.master.handler.ClosedRegionHandler:
Handling CLOSED event for 01188a4d5a6db06f14f03211330e5ebb
2013-12-29 11:41:34,701 DEBUG org.apache.hadoop.hbase.master.handler.ClosedRegionHandler:
Handling CLOSED event for 01188a4d5a6db06f14f03211330e5ebb
2013-12-29 11:41:34,729 DEBUG org.apache.hadoop.hbase.master.handler.ClosedRegionHandler:
Handling CLOSED event for b75cb9067c3c4456d6198c9237c143b3
2013-12-29 11:41:34,730 DEBUG org.apache.hadoop.hbase.master.handler.ClosedRegionHandler:
Handling CLOSED event for c576e5591b962f4b5d2850492432f95d
2013-12-29 11:41:34,837 DEBUG org.apache.hadoop.hbase.master.handler.ClosedRegionHandler:
Handling CLOSED event for c18a27df687492cec914e85329fa17b5
2013-12-29 11:41:34,873 DEBUG org.apache.hadoop.hbase.master.handler.ClosedRegionHandler:
Handling CLOSED event for 17bee313797fc1ce982c0e31fdb6620c
2013-12-29 11:41:35,090 DEBUG org.apache.hadoop.hbase.master.handler.ClosedRegionHandler:
Handling CLOSED event for 0b7c5e8c99e6a5f2039efed16b30ff9e
2013-12-29 11:41:35,113 DEBUG org.apache.hadoop.hbase.master.handler.ClosedRegionHandler:
Handling CLOSED event for d70b153d72679b1ee7ac6e1979df3c1f
2013-12-29 11:41:35,114 DEBUG org.apache.hadoop.hbase.master.handler.ClosedRegionHandler:
Handling CLOSED event for 0b7c5e8c99e6a5f2039efed16b30ff9e
2013-12-29 11:41:35,187 DEBUG org.apache.hadoop.hbase.master.handler.ClosedRegionHandler:
Handling CLOSED event for 1d7aa3a9b29ee9ce2d58b1b73cfc5543
2013-12-29 11:41:35,192 FATAL org.apache.hadoop.hbase.master.HMaster: Master server abort:
loaded coprocessors are: []
2013-12-29 11:41:35,193 FATAL org.apache.hadoop.hbase.master.HMaster: Unexpected state : page,ac.topsgolb.sthguohtsrebruht.www\x1Fhttp\x1F-1\x1F/search/label/smoking%20ban\x1Fnull,1381226128817.0b7c5e8c99e6a5f2039efed16b30ff9e.
state=PENDING_OPEN, ts=1388335295192, server=node8.distparser.com,60020,1388184406449 .. Cannot
transit it to OFFLINE.
java.lang.IllegalStateException: Unexpected state : page,ac.topsgolb.sthguohtsrebruht.www\x1Fhttp\x1F-1\x1F/search/label/smoking%20ban\x1Fnull,1381226128817.0b7c5e8c99e6a5f2039efed16b30ff9e.
state=PENDING_OPEN, ts=1388335295192, server=node8.distparser.com,60020,1388184406449 .. Cannot
transit it to OFFLINE.
    at org.apache.hadoop.hbase.master.AssignmentManager.setOfflineInZooKeeper(AssignmentManager.java:1890)
    at org.apache.hadoop.hbase.master.AssignmentManager.assign(AssignmentManager.java:1690)
    at org.apache.hadoop.hbase.master.AssignmentManager.assign(AssignmentManager.java:1426)
    at org.apache.hadoop.hbase.master.AssignmentManager.assign(AssignmentManager.java:1398)
    at org.apache.hadoop.hbase.master.AssignmentManager.assign(AssignmentManager.java:1393)
    at org.apache.hadoop.hbase.master.handler.ClosedRegionHandler.process(ClosedRegionHandler.java:105)
    at org.apache.hadoop.hbase.executor.EventHandler.run(EventHandler.java:175)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
    at java.lang.Thread.run(Thread.java:744)
2013-12-29 11:41:35,195 INFO org.apache.hadoop.hbase.master.HMaster: Aborting
2013-12-29 11:41:35,195 DEBUG org.apache.hadoop.hbase.master.HMaster: Stopping service threads
2013-12-29 11:41:35,195 INFO org.apache.hadoop.hbase.master.HMaster$2: node3.distparser.com,60000,1388335116794-BalancerChore
exiting
2013-12-29 11:41:35,195 INFO org.apache.hadoop.ipc.HBaseServer: Stopping server on 60000
2013-12-29 11:41:35,196 INFO org.apache.hadoop.ipc.HBaseServer: IPC Server handler 6 on 60000:
exiting
2013-12-29 11:41:35,196 INFO org.apache.hadoop.ipc.HBaseServer: IPC Server handler 1 on 60000:
exiting
2013-12-29 11:41:35,196 INFO org.apache.hadoop.ipc.HBaseServer: Stopping IPC Server listener
on 60000
2013-12-29 11:41:35,196 INFO org.apache.hadoop.ipc.HBaseServer: IPC Server handler 8 on 60000:
exiting
2013-12-29 11:41:35,196 INFO org.apache.hadoop.ipc.HBaseServer: IPC Server handler 9 on 60000:
exiting
2013-12-29 11:41:35,196 INFO org.apache.hadoop.ipc.HBaseServer: IPC Server handler 3 on 60000:
exiting
2013-12-29 11:41:35,196 INFO org.apache.hadoop.ipc.HBaseServer: REPL IPC Server handler 1
on 60000: exiting
2013-12-29 11:41:35,196 INFO org.apache.hadoop.ipc.HBaseServer: IPC Server handler 7 on 60000:
exiting
2013-12-29 11:41:35,196 INFO org.apache.hadoop.ipc.HBaseServer: IPC Server handler 5 on 60000:
exiting
2013-12-29 11:41:35,196 INFO org.apache.hadoop.ipc.HBaseServer: IPC Server handler 2 on 60000:
exiting
2013-12-29 11:41:35,196 INFO org.apache.hadoop.ipc.HBaseServer: IPC Server handler 4 on 60000:
exiting
2013-12-29 11:41:35,196 INFO org.apache.hadoop.hbase.master.cleaner.LogCleaner: master-node3.distparser.com,60000,1388335116794.oldLogCleaner
exiting
2013-12-29 11:41:35,196 INFO org.apache.hadoop.ipc.HBaseServer: IPC Server handler 0 on 60000:
exiting
2013-12-29 11:41:35,196 INFO org.apache.hadoop.ipc.HBaseServer: REPL IPC Server handler 0
on 60000: exiting
2013-12-29 11:41:35,196 INFO org.apache.hadoop.ipc.HBaseServer: REPL IPC Server handler 2
on 60000: exiting
2013-12-29 11:41:35,196 INFO org.apache.hadoop.ipc.HBaseServer: Stopping IPC Server Responder
2013-12-29 11:41:35,196 INFO org.apache.hadoop.hbase.master.cleaner.HFileCleaner: master-node3.distparser.com,60000,1388335116794.archivedHFileCleaner
exiting
2013-12-29 11:41:35,196 INFO org.apache.hadoop.hbase.master.HMaster: Stopping infoServer
2013-12-29 11:41:35,197 INFO org.apache.hadoop.ipc.HBaseServer: Stopping IPC Server Responder
2013-12-29 11:41:35,197 INFO org.mortbay.log: Stopped SelectChannelConnector@0.0.0.0:60010
2013-12-29 11:41:35,222 DEBUG org.apache.hadoop.hbase.master.handler.ClosedRegionHandler:
Handling CLOSED event for 42fa0cb7de3ecf237bcf31b5e766f630
2013-12-29 11:41:35,296 DEBUG org.apache.hadoop.hbase.master.handler.ClosedRegionHandler:
Handling CLOSED event for f1607272fcbb0dcf16d0bb96f59a9001
2013-12-29 11:41:35,297 DEBUG org.apache.hadoop.hbase.master.handler.ClosedRegionHandler:
Handling CLOSED event for 136e765b38663cdcc682ecff3d3e83f8
2013-12-29 11:41:35,298 WARN org.apache.hadoop.hbase.zookeeper.ZKUtil: master:60000-0x34335c5090e0483
Unable to get data of znode /hbase/unassigned/01188a4d5a6db06f14f03211330e5ebb
java.lang.InterruptedException
    at java.lang.Object.wait(Native Method)
    at java.lang.Object.wait(Object.java:503)
    at org.apache.zookeeper.ClientCnxn.submitRequest(ClientCnxn.java:1309)
    at org.apache.zookeeper.ZooKeeper.getData(ZooKeeper.java:1149)
    at org.apache.hadoop.hbase.zookeeper.RecoverableZooKeeper.getData(RecoverableZooKeeper.java:290)
    at org.apache.hadoop.hbase.zookeeper.ZKUtil.getDataNoWatch(ZKUtil.java:746)
    at org.apache.hadoop.hbase.zookeeper.ZKAssign.deleteNode(ZKAssign.java:488)
    at org.apache.hadoop.hbase.master.handler.OpenedRegionHandler.deleteOpenedNode(OpenedRegionHandler.java:129)
    at org.apache.hadoop.hbase.master.handler.OpenedRegionHandler.process(OpenedRegionHandler.java:103)
    at org.apache.hadoop.hbase.executor.EventHandler.run(EventHandler.java:175)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
    at java.lang.Thread.run(Thread.java:744)
2013-12-29 11:41:35,298 WARN org.apache.hadoop.hbase.master.AssignmentManager: Attempted to
create/force node into OFFLINE state before completing assignment but failed to do so for
page_proposed,\x13\x00\x00\x00\x00\x00\x00\x00ac.lligcm.www\x1Fhttp\x1F-1\x1F/study/2012-2013/faculties/science/undergraduate/courses/\x1Ffilters=language%3Aen%20ss_faculty%3AAG%20ss_faculty%3ASC%20ss_course_level%3A%22300%20level%22%20ss_course_level%3A%22200%20level%22%20ss_dept%3A0175%20ss_dept%3A0054%20ss_dept%3A0291%20ss_dept%3A0065%20ss_dept%3A0290%20ss_dept%3A0212%20ss_dept%3A0293%20ss_dept%3A0259%20ss_dept%3A0076%20sm_level%3AUndergraduate&solrsort=sort_title%20asc&BIGipServer%7ECCS_Sties%7EDRUPAL=884070532.20480.0000&BIGipServer%7ECCS_Sties%7EDRUPAL-443=867293316.47873.0000,1384353034924.f1607272fcbb0dcf16d0bb96f59a9001.
state=OFFLINE, ts=1388335295296, server=null
2013-12-29 11:41:35,299 WARN org.apache.hadoop.hbase.master.handler.OpenedRegionHandler: The
znode of the region page,pj.iravaj.www\x1Fhttp\x1F-1\x1F/landingpage/brandwomen/ref=topnav_sd_brand_s\x1Fie=UTF8&pf_rd_r=1D0TY2CPA9QH0C5C3ZED&pf_rd_m=A2EVFYIVZSJ3AR&pf_rd_t=301&pf_rd_i=0&pf_rd_p=122455449&pf_rd_s=headernav,1379104103471.01188a4d5a6db06f14f03211330e5ebb.
would have already been deleted
2013-12-29 11:41:35,299 ERROR org.apache.hadoop.hbase.master.handler.OpenedRegionHandler:
The znode of region page,pj.iravaj.www\x1Fhttp\x1F-1\x1F/landingpage/brandwomen/ref=topnav_sd_brand_s\x1Fie=UTF8&pf_rd_r=1D0TY2CPA9QH0C5C3ZED&pf_rd_m=A2EVFYIVZSJ3AR&pf_rd_t=301&pf_rd_i=0&pf_rd_p=122455449&pf_rd_s=headernav,1379104103471.01188a4d5a6db06f14f03211330e5ebb.
could not be deleted.
2013-12-29 11:41:35,299 WARN org.apache.hadoop.hbase.master.AssignmentManager: Attempted to
create/force node into OFFLINE state before completing assignment but failed to do so for
page,ofni.adanacniedamyllaer\x1Fhttp\x1F-1\x1F/dg/pe/auto_fuel-conversions/retirement_planning-consultants/commercial_commercial-&-industrial/cheese/pet_grooming-&-washing/golf_practice-&-driving-ranges/music_instrumental-instruction/associations/clubs/homes_special-care/\x1Fnull,1379104103471.136e765b38663cdcc682ecff3d3e83f8.
state=OFFLINE, ts=1388335295297, server=null
2013-12-29 11:41:35,308 INFO org.apache.hadoop.hbase.master.AssignmentManager$TimeoutMonitor:
node3.distparser.com,60000,1388335116794.timeoutMonitor exiting
2013-12-29 11:41:35,326 DEBUG org.apache.hadoop.hbase.catalog.CatalogTracker: Stopping catalog
tracker org.apache.hadoop.hbase.catalog.CatalogTracker@4c8d0351
2013-12-29 11:41:35,327 WARN org.apache.hadoop.hbase.master.AssignmentManager: Received OPENED
for region 01188a4d5a6db06f14f03211330e5ebb from server node5.distparser.com,60020,1388184401716
but region was in  the state page,pj.iravaj.www\x1Fhttp\x1F-1\x1F/landingpage/brandwomen/ref=topnav_sd_brand_s\x1Fie=UTF8&pf_rd_r=1D0TY2CPA9QH0C5C3ZED&pf_rd_m=A2EVFYIVZSJ3AR&pf_rd_t=301&pf_rd_i=0&pf_rd_p=122455449&pf_rd_s=headernav,1379104103471.01188a4d5a6db06f14f03211330e5ebb.
state=OPEN, ts=1388335290361, server=node5.distparser.com,60020,1388184401716 and not in expected
OFFLINE, PENDING_OPEN or OPENING states
2013-12-29 11:41:35,333 ERROR org.apache.hadoop.hbase.executor.ExecutorService: Cannot submit
[ClosedRegionHandler-node3.distparser.com,60000,1388335116794-42] because the executor is
missing. Is this process shutting down?
2013-12-29 11:41:35,335 WARN org.apache.hadoop.hbase.master.AssignmentManager: Received OPENED
for region 01188a4d5a6db06f14f03211330e5ebb from server node5.distparser.com,60020,1388184401716
but region was in  the state page,pj.iravaj.www\x1Fhttp\x1F-1\x1F/landingpage/brandwomen/ref=topnav_sd_brand_s\x1Fie=UTF8&pf_rd_r=1D0TY2CPA9QH0C5C3ZED&pf_rd_m=A2EVFYIVZSJ3AR&pf_rd_t=301&pf_rd_i=0&pf_rd_p=122455449&pf_rd_s=headernav,1379104103471.01188a4d5a6db06f14f03211330e5ebb.
state=OPEN, ts=1388335290361, server=node5.distparser.com,60020,1388184401716 and not in expected
OFFLINE, PENDING_OPEN or OPENING states
2013-12-29 11:41:35,335 ERROR org.apache.hadoop.hbase.executor.ExecutorService: Cannot submit
[ClosedRegionHandler-node3.distparser.com,60000,1388335116794-43] because the executor is
missing. Is this process shutting down?
2013-12-29 11:41:35,336 ERROR org.apache.hadoop.hbase.executor.ExecutorService: Cannot submit
[ClosedRegionHandler-node3.distparser.com,60000,1388335116794-44] because the executor is
missing. Is this process shutting down?
2013-12-29 11:41:35,336 ERROR org.apache.hadoop.hbase.executor.ExecutorService: Cannot submit
[ClosedRegionHandler-node3.distparser.com,60000,1388335116794-45] because the executor is
missing. Is this process shutting down?
2013-12-29 11:41:35,337 WARN org.apache.hadoop.hbase.master.AssignmentManager: Received OPENED
for region 01188a4d5a6db06f14f03211330e5ebb from server node5.distparser.com,60020,1388184401716
but region was in  the state page,pj.iravaj.www\x1Fhttp\x1F-1\x1F/landingpage/brandwomen/ref=topnav_sd_brand_s\x1Fie=UTF8&pf_rd_r=1D0TY2CPA9QH0C5C3ZED&pf_rd_m=A2EVFYIVZSJ3AR&pf_rd_t=301&pf_rd_i=0&pf_rd_p=122455449&pf_rd_s=headernav,1379104103471.01188a4d5a6db06f14f03211330e5ebb.
state=OPEN, ts=1388335290361, server=node5.distparser.com,60020,1388184401716 and not in expected
OFFLINE, PENDING_OPEN or OPENING states
2013-12-29 11:41:35,337 WARN org.apache.hadoop.hbase.master.AssignmentManager: Received FAILED_OPEN
for region b75cb9067c3c4456d6198c9237c143b3 from server node4.distparser.com,60020,1388184407264
but region was in  the state page,rf.idua.www\x1Fhttp\x1F-1\x1F/fr/brand/fr/audi_fleet_solutions/contact/contact_transport_personnes.html\x1Fnull,1379103792232.b75cb9067c3c4456d6198c9237c143b3.
state=CLOSED, ts=1388335295034, server=node4.distparser.com,60020,1388184407264 and not in
OFFLINE, PENDING_OPEN or OPENING
2013-12-29 11:41:35,339 WARN org.apache.hadoop.hbase.master.AssignmentManager: Received FAILED_OPEN
for region c576e5591b962f4b5d2850492432f95d from server node4.distparser.com,60020,1388184407264
but region was in  the state page,ten.yrotceridsrevomsrekcap.www\x1Fhttp\x1F-1\x1F/Packers_Movers_kanpur.html\x1Fnull,1379081871633.c576e5591b962f4b5d2850492432f95d.
state=CLOSED, ts=1388335295151, server=node4.distparser.com,60020,1388184407264 and not in
OFFLINE, PENDING_OPEN or OPENING
2013-12-29 11:41:35,414 ERROR org.apache.hadoop.hbase.executor.ExecutorService: Cannot submit
[OpenedRegionHandler-node3.distparser.com,60000,1388335116794-46] because the executor is
missing. Is this process shutting down?
2013-12-29 11:41:35,426 INFO org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation:
Closed zookeeper sessionid=0x24262655e121196
2013-12-29 11:41:35,429 ERROR org.apache.hadoop.hbase.executor.ExecutorService: Cannot submit
[OpenedRegionHandler-node3.distparser.com,60000,1388335116794-47] because the executor is
missing. Is this process shutting down?
2013-12-29 11:41:35,448 INFO org.apache.hadoop.hbase.master.AssignmentManager$TimerUpdater:
node3.distparser.com,60000,1388335116794.timerUpdater exiting
2013-12-29 11:41:35,448 INFO org.apache.hadoop.hbase.master.SplitLogManager$TimeoutMonitor:
node3.distparser.com,60000,1388335116794.splitLogManagerTimeoutMonitor exiting
2013-12-29 11:41:35,460 INFO org.apache.hadoop.hbase.master.HMaster: HMaster main thread exiting
2013-12-29 11:41:35,460 ERROR org.apache.hadoop.hbase.master.HMasterCommandLine: Failed to
start master
java.lang.RuntimeException: HMaster Aborted
    at org.apache.hadoop.hbase.master.HMasterCommandLine.startMaster(HMasterCommandLine.java:160)
    at org.apache.hadoop.hbase.master.HMasterCommandLine.run(HMasterCommandLine.java:104)
    at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:65)
    at org.apache.hadoop.hbase.util.ServerCommandLine.doMain(ServerCommandLine.java:76)
    at org.apache.hadoop.hbase.master.HMaster.main(HMaster.java:2120)
{code}

Again, multiple time the same region called in ClosedRegionHandler...
I will apply your patch on my master and retry. 

> [0.94] AssignmentManager throws IllegalStateException from PENDING_OPEN to OFFLINE
> ----------------------------------------------------------------------------------
>
>                 Key: HBASE-8912
>                 URL: https://issues.apache.org/jira/browse/HBASE-8912
>             Project: HBase
>          Issue Type: Bug
>            Reporter: Enis Soztutar
>            Priority: Critical
>             Fix For: 0.94.16
>
>         Attachments: 8912-0.94-alt2.txt, 8912-0.94.txt, HBase-0.94 #1036 test - testRetrying
[Jenkins].html, log.txt, org.apache.hadoop.hbase.catalog.TestMetaReaderEditor-output.txt
>
>
> AM throws this exception which subsequently causes the master to abort: 
> {code}
> java.lang.IllegalStateException: Unexpected state : testRetrying,jjj,1372891751115.9b828792311001062a5ff4b1038fe33b.
state=PENDING_OPEN, ts=1372891751912, server=hemera.apache.org,39064,1372891746132 .. Cannot
transit it to OFFLINE.
> 	at org.apache.hadoop.hbase.master.AssignmentManager.setOfflineInZooKeeper(AssignmentManager.java:1879)
> 	at org.apache.hadoop.hbase.master.AssignmentManager.assign(AssignmentManager.java:1688)
> 	at org.apache.hadoop.hbase.master.AssignmentManager.assign(AssignmentManager.java:1424)
> 	at org.apache.hadoop.hbase.master.AssignmentManager.assign(AssignmentManager.java:1399)
> 	at org.apache.hadoop.hbase.master.AssignmentManager.assign(AssignmentManager.java:1394)
> 	at org.apache.hadoop.hbase.master.handler.ClosedRegionHandler.process(ClosedRegionHandler.java:105)
> 	at org.apache.hadoop.hbase.executor.EventHandler.run(EventHandler.java:175)
> 	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:895)
> 	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:918)
> 	at java.lang.Thread.run(Thread.java:662)
> {code}
> This exception trace is from the failing test TestMetaReaderEditor which is failing pretty
frequently, but looking at the test code, I think this is not a test-only issue, but affects
the main code path. 
> https://builds.apache.org/job/HBase-0.94/1036/testReport/junit/org.apache.hadoop.hbase.catalog/TestMetaReaderEditor/testRetrying/



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