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From "Jean-Daniel Cryans (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (HBASE-7534) [replication] TestReplication.queueFailover can fail because HBaseTestingUtility.createMultiRegions is dangerous
Date Fri, 11 Jan 2013 00:56:13 GMT

     [ https://issues.apache.org/jira/browse/HBASE-7534?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jean-Daniel Cryans resolved HBASE-7534.
---------------------------------------

      Resolution: Fixed
    Hadoop Flags: Reviewed

Committed to trunk and 0.94
                
> [replication] TestReplication.queueFailover can fail because HBaseTestingUtility.createMultiRegions
is dangerous
> ----------------------------------------------------------------------------------------------------------------
>
>                 Key: HBASE-7534
>                 URL: https://issues.apache.org/jira/browse/HBASE-7534
>             Project: HBase
>          Issue Type: Bug
>    Affects Versions: 0.94.3
>            Reporter: Jean-Daniel Cryans
>            Assignee: Jean-Daniel Cryans
>             Fix For: 0.96.0, 0.94.5
>
>         Attachments: HBASE-7534.patch
>
>
> {{HBaseTestingUtility.createMultiRegions}} is an abomination, it uses an already existing
table and hot replaces the regions in it. I've seen TestReplication failing a few times because
the "old" first region is still assigned and tried to flush but crashed due to the fact that
the region's folder is missing in HDFS: 
> {noformat}
> 2013-01-04 10:04:45,500 DEBUG [RegionServer:1;172.21.3.117,57114,1357322589018.cacheFlusher]
regionserver.Store(844): Renaming flushed file at hdfs://localhost:57099/user/jdcryans/hbase/test/62c85f8a6e3d0e32b2fb21326537f5a6/.tmp/b938b33268064312abfc250d2eeca61d
to hdfs://localhost:57099/user/jdcryans/hbase/test/62c85f8a6e3d0e32b2fb21326537f5a6/f/b938b33268064312abfc250d2eeca61d
> 2013-01-04 10:04:45,500 WARN  [IPC Server handler 8 on 57099] namenode.FSDirectory(422):
DIR* FSDirectory.unprotectedRenameTo: failed to rename /user/jdcryans/hbase/test/62c85f8a6e3d0e32b2fb21326537f5a6/.tmp/b938b33268064312abfc250d2eeca61d
to /user/jdcryans/hbase/test/62c85f8a6e3d0e32b2fb21326537f5a6/f/b938b33268064312abfc250d2eeca61d
because destination's parent does not exist
> 2013-01-04 10:04:45,503 WARN  [RegionServer:1;172.21.3.117,57114,1357322589018.cacheFlusher]
regionserver.Store(847): Unable to rename hdfs://localhost:57099/user/jdcryans/hbase/test/62c85f8a6e3d0e32b2fb21326537f5a6/.tmp/b938b33268064312abfc250d2eeca61d
to hdfs://localhost:57099/user/jdcryans/hbase/test/62c85f8a6e3d0e32b2fb21326537f5a6/f/b938b33268064312abfc250d2eeca61d
> 2013-01-04 10:04:45,504 WARN  [DataStreamer for file /user/jdcryans/hbase/.logs/172.21.3.117,57113,1357322588994/172.21.3.117%2C57113%2C1357322588994.1357322683769]
hdfs.DFSClient$DFSOutputStream$DataStreamer(2873): DataStreamer Exception: org.apache.hadoop.ipc.RemoteException:
org.apache.hadoop.hdfs.server.namenode.LeaseExpiredException: No lease on /user/jdcryans/hbase/.logs/172.21.3.117,57113,1357322588994/172.21.3.117%2C57113%2C1357322588994.1357322683769
File does not exist. [Lease.  Holder: DFSClient_hb_rs_172.21.3.117,57113,1357322588994, pendingcreates:
1]
> {noformat}
> Eventually the test times out because both region servers on the master cluster are dead.
> It can be easily fixed by pre-creating the table with enough regions.
> FWIW a bunch of other tests are using this facility, my IDE tells me that the 3 methods
are called 25 times outside of {{HBaseTestingUtility}}.

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