Ted Yu created HBASE-8582:
-----------------------------

             Summary: Possible NullPointerException in 
ZKInterProcessLockBase#visitLocks
                 Key: HBASE-8582
                 URL: https://issues.apache.org/jira/browse/HBASE-8582
             Project: HBase
          Issue Type: Bug
            Reporter: Ted Yu
         Attachments: 8582-v1.txt

Running test suite on hadoop 2.0 I saw the following test failure:
{code}
testErrorReporter(org.apache.hadoop.hbase.util.TestHBaseFsck)  Time elapsed: 
0.003 sec  <<< ERROR!
java.lang.NullPointerException
        at 
org.apache.hadoop.hbase.zookeeper.lock.ZKInterProcessLockBase.visitLocks(ZKInterProcessLockBase.java:426)
        at 
org.apache.hadoop.hbase.master.TableLockManager$ZKTableLockManager.visitAllLocks(TableLockManager.java:386)
        at 
org.apache.hadoop.hbase.util.hbck.TableLockChecker.checkTableLocks(TableLockChecker.java:76)
        at 
org.apache.hadoop.hbase.util.HBaseFsck.checkAndFixTableLocks(HBaseFsck.java:2480)
        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.testErrorReporter(TestHBaseFsck.java:1868)
{code}
Here is related code:
{code}
  public void visitLocks(MetadataHandler handler) throws IOException {
    List<String> children;
    try {
      children = ZKUtil.listChildrenNoWatch(zkWatcher, parentLockNode);
{code}
Looks like children was null.

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