From 90bd4de7cff6ae18ae924b5e790f03e39a274617 Mon Sep 17 00:00:00 2001
From: Zhihong Yu <tedyu@apache.org>
Date: Tue, 14 May 2013 16:27:41 +0000
Subject: [PATCH] HBASE-8536 Possible NullPointerException in
 ZKInterProcessLockBase#reapExpiredLocks (Ted Yu)

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1482429 13f79535-47bb-0310-9956-ffa450edef68
---
 .../hadoop/hbase/zookeeper/lock/ZKInterProcessLockBase.java      | 1 +
 1 file changed, 1 insertion(+)

diff --git a/hbase-server/src/main/java/org/apache/hadoop/hbase/zookeeper/lock/ZKInterProcessLockBase.java b/hbase-server/src/main/java/org/apache/hadoop/hbase/zookeeper/lock/ZKInterProcessLockBase.java
index 670cf9121be..5a0fa641dda 100644
--- a/hbase-server/src/main/java/org/apache/hadoop/hbase/zookeeper/lock/ZKInterProcessLockBase.java
+++ b/hbase-server/src/main/java/org/apache/hadoop/hbase/zookeeper/lock/ZKInterProcessLockBase.java
@@ -386,6 +386,7 @@ public abstract class ZKInterProcessLockBase implements InterProcessLock {
       LOG.error("Unexpected ZooKeeper error when listing children", e);
       throw new IOException("Unexpected ZooKeeper exception", e);
     }
+    if (children == null) return;
 
     KeeperException deferred = null;
     Stat stat = new Stat();