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From "Hairong Kuang (JIRA)" <j...@apache.org>
Subject [jira] Created: (HBASE-3059) TestReadWriteConsistencyControl occasionally hangs
Date Thu, 30 Sep 2010 21:34:37 GMT
TestReadWriteConsistencyControl occasionally hangs

                 Key: HBASE-3059
                 URL: https://issues.apache.org/jira/browse/HBASE-3059
             Project: HBase
          Issue Type: Bug
            Reporter: Hairong Kuang
            Assignee: Hairong Kuang

The test hung when I ran mvn test today. The jstack shows that a Writer thread hung at

"Thread-1" prio=10 tid=0x00002aaad81d2800 nid=0x6ce9 in Object.wait() [0x0000000040f37000]
   java.lang.Thread.State: WAITING (on object monitor)  at java.lang.Object.wait(Native Method)
  at org.apache.hadoop.hbase.regionserver.ReadWriteConsistencyControl.completeMemstoreInsert(ReadWriteConsistencyControl.java:130)
  - locked <0x00002aaac9fa0f50> (a java.lang.Object)                
  at org.apache.hadoop.hbase.regionserver.TestReadWriteConsistencyControl$Writer.run(TestReadWriteConsistencyControl.java:56)
 at java.lang.Thread.run(Thread.java:619)

It seems to be caused by a race condition in ReadWriteConsistencyControl#completeMemStoreInsert.
Accesses/updates of the value of memStoreRead should be done while holding the readWaiters

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