[jira] [Created] (HBASE-14495) TestHRegion#testFlushCacheWhileScanning goes zombie

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

stack created HBASE-14495:
-----------------------------

             Summary: TestHRegion#testFlushCacheWhileScanning goes zombie
                 Key: HBASE-14495
                 URL: https://issues.apache.org/jira/browse/HBASE-14495
             Project: HBase
          Issue Type: Sub-task
          Components: test
            Reporter: stack
            Assignee: stack


This test goes zombie on us, most recently, here: https://builds.apache.org/job/PreCommit-HBASE-Build/15744//console

It does not fail on my internal rig runs nor locally on laptop when run in a loop.

Its hung up in close of the region:

{code}
"main" prio=10 tid=0x00007fc49800a800 nid=0x6053 in Object.wait() [0x00007fc4a02c9000]
   java.lang.Thread.State: WAITING (on object monitor)
	at java.lang.Object.wait(Native Method)
	- waiting on <0x00000007d07c3478> (a java.lang.Object)
	at org.apache.hadoop.hbase.regionserver.MultiVersionConcurrencyControl.waitForRead(MultiVersionConcurrencyControl.java:207)
	- locked <0x00000007d07c3478> (a java.lang.Object)
	at org.apache.hadoop.hbase.regionserver.MultiVersionConcurrencyControl.completeAndWait(MultiVersionConcurrencyControl.java:143)
	at org.apache.hadoop.hbase.regionserver.HRegion.internalPrepareFlushCache(HRegion.java:2257)
	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 <0x00000007d07c34a8> (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.testFlushCacheWhileScanning(TestHRegion.java:3756)
{code}

It is waiting on mvcc to catch up.

There is this comment at the point where we are hung:


            // TODO: Lets see if we hang here, if there is a scenario where an outstanding reader
            // with a read point is in advance of this write point.
            mvcc.completeAndWait(writeEntry);


The above came in with HBASE-12751. The comment was added at v29:

https://issues.apache.org/jira/secure/attachment/12754775/12751.rebased.v29.txt

Looks like I added it so must have had predilection that this might be dodgy... Let me take a look... 




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