[HBASE-5722] NPE in ZKUtil#getChildDataAndWatchForNewChildren when ZK not available or NW down.

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.94.0, 0.95.2
• Fix Version/s: 0.94.1, 0.95.0
• Component/s: Zookeeper
• Hadoop Flags: Reviewed
• Assignee: Uma Maheswara Rao G
• Reporter: Uma Maheswara Rao G
• Created: 05/Apr/12 09:31
• Updated: 26/Feb/13 08:15
• Resolved: 30/May/12 17:07

Description

List<String> nodes =
      ZKUtil.listChildrenAndWatchForNewChildren(zkw, baseNode);
    List<NodeAndData> newNodes = new ArrayList<NodeAndData>();
    for (String node: nodes) {
      String nodePath = ZKUtil.joinZNode(baseNode, node);
      byte [] data = ZKUtil.getDataAndWatch(zkw, nodePath);
      newNodes.add(new NodeAndData(nodePath, data));
    }

The above code can throw NPE when listChildrenAndWatchForNewChildren returns null.