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From "Wang Qiang (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-7728) deadlock occurs between hlog roller and hlog syncer
Date Thu, 31 Jan 2013 07:37:13 GMT
Wang Qiang created HBASE-7728:
---------------------------------

             Summary: deadlock occurs between hlog roller and hlog syncer
                 Key: HBASE-7728
                 URL: https://issues.apache.org/jira/browse/HBASE-7728
             Project: HBase
          Issue Type: Bug
          Components: wal
    Affects Versions: 0.94.2
         Environment: Linux 2.6.18-164.el5 x86_64 GNU/Linux
            Reporter: Wang Qiang
            Priority: Blocker


the hlog roller thread and hlog syncer thread may occur dead lock with the 'flushLock' and
'updateLock', and then cause all 'IPC Server handler' thread blocked on hlog append. the jstack
info is as follow :
"regionserver60020.logRoller":
        at org.apache.hadoop.hbase.regionserver.wal.HLog.syncer(HLog.java:1305)
        - waiting to lock <0x000000067bf88d58> (a java.lang.Object)
        at org.apache.hadoop.hbase.regionserver.wal.HLog.syncer(HLog.java:1283)
        at org.apache.hadoop.hbase.regionserver.wal.HLog.sync(HLog.java:1456)
        at org.apache.hadoop.hbase.regionserver.wal.HLog.cleanupCurrentWriter(HLog.java:876)
        at org.apache.hadoop.hbase.regionserver.wal.HLog.rollWriter(HLog.java:657)
        - locked <0x000000067d54ace0> (a java.lang.Object)
        at org.apache.hadoop.hbase.regionserver.LogRoller.run(LogRoller.java:94)
        at java.lang.Thread.run(Thread.java:662)
"regionserver60020.logSyncer":
        at org.apache.hadoop.hbase.regionserver.wal.HLog.syncer(HLog.java:1314)
        - waiting to lock <0x000000067d54ace0> (a java.lang.Object)
        - locked <0x000000067bf88d58> (a java.lang.Object)
        at org.apache.hadoop.hbase.regionserver.wal.HLog.syncer(HLog.java:1283)
        at org.apache.hadoop.hbase.regionserver.wal.HLog.sync(HLog.java:1456)
        at org.apache.hadoop.hbase.regionserver.wal.HLog$LogSyncer.run(HLog.java:1235)
        at java.lang.Thread.run(Thread.java:662)

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