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From "Jean-Daniel Cryans (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-7534) [replication] TestReplication.queueFailover can fail because HBaseTestingUtility.createMultiRegions is dangerous
Date Thu, 10 Jan 2013 21:06:13 GMT
Jean-Daniel Cryans created HBASE-7534:
-----------------------------------------

             Summary: [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


{{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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