[jira] [Created] (HBASE-14305) Deadlock observed in MVCC during Unit Testing

["Yu Li (JIRA)" <ji...@apache.org>]

Yu Li created HBASE-14305:
-----------------------------

             Summary: Deadlock observed in MVCC during Unit Testing
                 Key: HBASE-14305
                 URL: https://issues.apache.org/jira/browse/HBASE-14305
             Project: HBase
          Issue Type: Bug
            Reporter: Yu Li


As titled, this failure is reported in a UT check by HadoopQA, below is part of the stack trace:
{noformat}
"main" prio=10 tid=0x00007fb77000a800 nid=0x5004 in Object.wait() [0x00007fb778799000]
   java.lang.Thread.State: WAITING (on object monitor)
	at java.lang.Object.wait(Native Method)
	- waiting on <0x00000007ee9a5260> (a java.util.LinkedList)
	at org.apache.hadoop.hbase.regionserver.MultiVersionConcurrencyControl.waitForPreviousTransactionsComplete(MultiVersionConcurrencyControl.java:224)
	- locked <0x00000007ee9a5260> (a java.util.LinkedList)
	at org.apache.hadoop.hbase.regionserver.HRegion.internalPrepareFlushCache(HRegion.java:2254)
	at org.apache.hadoop.hbase.regionserver.HRegion.internalFlushcache(HRegion.java:2061)
	at org.apache.hadoop.hbase.regionserver.HRegion.internalFlushcache(HRegion.java:2026)
	at org.apache.hadoop.hbase.regionserver.HRegion.internalFlushcache(HRegion.java:2016)
	at org.apache.hadoop.hbase.regionserver.HRegion.doClose(HRegion.java:1423)
	at org.apache.hadoop.hbase.regionserver.HRegion.close(HRegion.java:1344)
	- locked <0x00000007ee9c85e8> (a java.lang.Object)
	at org.apache.hadoop.hbase.regionserver.HRegion.close(HRegion.java:1295)
	at org.apache.hadoop.hbase.HBaseTestingUtility.closeRegionAndWAL(HBaseTestingUtility.java:352)
	at org.apache.hadoop.hbase.regionserver.TestHRegion.testWritesWhileGetting(TestHRegion.java:3999)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
{noformat}
It seems we are waiting on the same waitQueue object after got its lock.

Full stack trace please refer to [this link|https://builds.apache.org/job/PreCommit-HBASE-Build/15244//consoleFull]



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