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From "Ted Yu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-8536) Possible NullPointerException in ZKInterProcessLockBase#reapExpiredLocks
Date Tue, 14 May 2013 16:31:16 GMT

    [ https://issues.apache.org/jira/browse/HBASE-8536?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13657186#comment-13657186
] 

Ted Yu commented on HBASE-8536:
-------------------------------

Thanks for the review, Jeff.

Integrated to 0.95 and trunk.
                
> Possible NullPointerException in ZKInterProcessLockBase#reapExpiredLocks
> ------------------------------------------------------------------------
>
>                 Key: HBASE-8536
>                 URL: https://issues.apache.org/jira/browse/HBASE-8536
>             Project: HBase
>          Issue Type: Bug
>            Reporter: Ted Yu
>            Assignee: Ted Yu
>             Fix For: 0.98.0
>
>         Attachments: 8536-v1.txt
>
>
> When I ran TestHBaseFsck, I sometimes saw:
> {code}
> testNoVersionFile(org.apache.hadoop.hbase.util.TestHBaseFsck)  Time elapsed: 0.003 sec
 <<< ERROR!
> java.io.IOException: java.lang.NullPointerException
>         at org.apache.hadoop.hbase.master.TableLockManager$ZKTableLockManager.reapAllExpiredLocks(TableLockManager.java:433)
>         at org.apache.hadoop.hbase.util.hbck.TableLockChecker.fixExpiredTableLocks(TableLockChecker.java:83)
>         at org.apache.hadoop.hbase.util.HBaseFsck.checkAndFixTableLocks(HBaseFsck.java:2483)
>         at org.apache.hadoop.hbase.util.HBaseFsck.onlineHbck(HBaseFsck.java:460)
>         at org.apache.hadoop.hbase.util.hbck.HbckTestingUtil.doFsck(HbckTestingUtil.java:65)
>         at org.apache.hadoop.hbase.util.hbck.HbckTestingUtil.doFsck(HbckTestingUtil.java:41)
>         at org.apache.hadoop.hbase.util.hbck.HbckTestingUtil.doFsck(HbckTestingUtil.java:36)
>         at org.apache.hadoop.hbase.util.TestHBaseFsck.testNoVersionFile(TestHBaseFsck.java:1086)
> ...
> Caused by: java.lang.NullPointerException
>         at org.apache.hadoop.hbase.zookeeper.lock.ZKInterProcessLockBase.reapExpiredLocks(ZKInterProcessLockBase.java:393)
>         at org.apache.hadoop.hbase.master.TableLockManager$ZKTableLockManager.reapAllExpiredLocks(TableLockManager.java:427)
>         ... 37 more
> {code}
> This was due to null being returned from ZKUtil.listChildrenNoWatch() at line 384:
> {code}
>       children = ZKUtil.listChildrenNoWatch(zkWatcher, parentLockNode);
> {code}

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