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From "zhangduo (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-13308) Fix flaky TestEndToEndSplitTransaction
Date Sat, 21 Mar 2015 07:08:38 GMT
zhangduo created HBASE-13308:
--------------------------------

             Summary: Fix flaky TestEndToEndSplitTransaction
                 Key: HBASE-13308
                 URL: https://issues.apache.org/jira/browse/HBASE-13308
             Project: HBase
          Issue Type: Bug
          Components: test
            Reporter: zhangduo
            Assignee: zhangduo


https://builds.apache.org/job/HBase-TRUNK-jacoco/24/testReport/junit/org.apache.hadoop.hbase.regionserver/TestEndToEndSplitTransaction/testFromClientSideWhileSplitting/

First, we split 'e9eb97847340ea7c6b9616d63d62a784' to  'abe1973ea732066b12d8e33fce12a951'
and '4940dad7ef9b4b699fd13eede5740d9d'.

And then, we try to split 'abe1973ea732066b12d8e33fce12a951'.
{noformat}
2015-03-21 03:58:46,970 INFO  [Thread-191] regionserver.TestEndToEndSplitTransaction(399):
Initiating region split for:testFromClientSideWhileSplitting,,1426910324847.abe1973ea732066b12d8e33fce12a951.
2015-03-21 03:58:46,976 INFO  [PriorityRpcServer.handler=7,queue=1,port=54177] regionserver.RSRpcServices(1596):
Splitting testFromClientSideWhileSplitting,,1426910324847.abe1973ea732066b12d8e33fce12a951.
2015-03-21 03:58:46,977 DEBUG [PriorityRpcServer.handler=7,queue=1,port=54177] regionserver.CompactSplitThread(259):
Split requested for testFromClientSideWhileSplitting,,1426910324847.abe1973ea732066b12d8e33fce12a951..
 compaction_queue=(0:0), split_queue=1, merge_queue=0
2015-03-21 03:58:46,978 INFO  [Thread-191] regionserver.TestEndToEndSplitTransaction(399):
blocking until region is split:testFromClientSideWhileSplitting,,1426910324847.abe1973ea732066b12d8e33fce12a951.
2015-03-21 03:58:46,985 DEBUG [RS:0;priapus:54177-splits-1426910324832] lock.ZKInterProcessLockBase(226):
Acquired a lock for /hbase/table-lock/testFromClientSideWhileSplitting/read-regionserver:541770000000002
2015-03-21 03:58:46,988 DEBUG [RS:0;priapus:54177-splits-1426910324832] lock.ZKInterProcessLockBase(328):
Released /hbase/table-lock/testFromClientSideWhileSplitting/read-regionserver:541770000000002
2015-03-21 03:58:46,988 DEBUG [Thread-191] ipc.AsyncRpcClient(163): Use global event loop
group NioEventLoopGroup
2015-03-21 03:58:46,988 INFO  [RS:0;priapus:54177-splits-1426910324832] regionserver.SplitRequest(142):
Split transaction journal:
	STARTED at 1426910326977
{noformat}

We can see that it failed without any error message.
I think can only happen when the parent is not splittable or we can not find a splitrow.
{noformat}
2015-03-21 03:58:47,019 INFO  [RS:0;priapus:54177-shortCompactions-1426910324308] regionserver.HStore(1334):
Completed major compaction of 2 (all) file(s) in family of testFromClientSideWhileSplitting,,1426910324847.abe1973ea732066b12d8e33fce12a951.
into e97bccdc4b014c15a52a579cd49ebb31(size=12.6 K), total size for store is 12.6 K. This selection
was in queue for 0sec, and took 0sec to execute.
2015-03-21 03:58:47,019 INFO  [RS:0;priapus:54177-shortCompactions-1426910324308] regionserver.CompactSplitThread$CompactionRunner(523):
Completed compaction: Request = regionName=testFromClientSideWhileSplitting,,1426910324847.abe1973ea732066b12d8e33fce12a951.,
storeName=family, fileCount=2, fileSize=25.5 K, priority=1, time=14542808784655186; duration=0sec
2015-03-21 03:58:47,020 DEBUG [RS:0;priapus:54177-shortCompactions-1426910324308] regionserver.CompactSplitThread$CompactionRunner(546):
CompactSplitThread Status: compaction_queue=(0:0), split_queue=0, merge_queue=0
{noformat}

We can see that, the compaction was completed at 03:58:47,019, but split is started at 03:58:46,970
which is earlier.
So we have a reference file and is not splittable.

I think the problem is 'compactAndBlockUntilDone' is not reliable, it may return before the
compaction complete.

Will try to prepare a patch.



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