Ted Yu created HBASE-8536:
-----------------------------
Summary: 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
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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