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Posted to dev@hbase.apache.org by "Lars Hofhansl (JIRA)" <ji...@apache.org> on 2013/02/01 23:40:13 UTC
[jira] [Resolved] (HBASE-7728) deadlock occurs between hlog roller
and hlog syncer
[ https://issues.apache.org/jira/browse/HBASE-7728?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Lars Hofhansl resolved HBASE-7728.
----------------------------------
Resolution: Fixed
Hadoop Flags: Reviewed
> 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
> Assignee: Ted Yu
> Priority: Blocker
> Fix For: 0.96.0, 0.94.5
>
> Attachments: 7728-0.94-simplified.txt, 7728-0.94.txt, 7728-0.94-v2.txt, 7728-suggest-0.96.txt, 7728-suggest.txt, 7728-v1.txt, 7728-v2.txt, 7728-v3.txt, 7728-v4.txt
>
>
> 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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