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

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1310104 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Michael Stack 2012-04-05 22:09:41 +00:00
parent 1140530cc2
commit fa97600ea9
2 changed files with 25 additions and 8 deletions
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21
src/main/java/org/apache/hadoop/hbase/zookeeper/ZKUtil.java
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@ -26,6 +26,7 @@ import java.io.PrintWriter;
import java.net.InetSocketAddress; import java.net.InetSocketAddress;
import java.net.Socket; import java.net.Socket;
import java.util.ArrayList; import java.util.ArrayList;
import java.util.Collections;
import java.util.List; import java.util.List;
import java.util.Properties; import java.util.Properties;
@ -35,17 +36,19 @@ import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.classification.InterfaceAudience; import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability; import org.apache.hadoop.classification.InterfaceStability;
import org.apache.hadoop.conf.Configuration; import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.*; import org.apache.hadoop.hbase.EmptyWatcher;
import org.apache.hadoop.hbase.HConstants;
import org.apache.hadoop.hbase.ServerName;
import org.apache.hadoop.hbase.executor.RegionTransitionData; import org.apache.hadoop.hbase.executor.RegionTransitionData;
import org.apache.hadoop.hbase.util.Bytes; import org.apache.hadoop.hbase.util.Bytes;
import org.apache.hadoop.hbase.util.Threads; import org.apache.hadoop.hbase.util.Threads;
import org.apache.zookeeper.AsyncCallback; import org.apache.zookeeper.AsyncCallback;
import org.apache.zookeeper.CreateMode; import org.apache.zookeeper.CreateMode;
import org.apache.zookeeper.KeeperException; import org.apache.zookeeper.KeeperException;
import org.apache.zookeeper.KeeperException.NoNodeException;
import org.apache.zookeeper.Watcher; import org.apache.zookeeper.Watcher;
import org.apache.zookeeper.ZooDefs.Ids;
import org.apache.zookeeper.ZooKeeper; import org.apache.zookeeper.ZooKeeper;
import org.apache.zookeeper.KeeperException.NoNodeException;
import org.apache.zookeeper.ZooDefs.Ids;
import org.apache.zookeeper.data.ACL; import org.apache.zookeeper.data.ACL;
import org.apache.zookeeper.data.Stat; import org.apache.zookeeper.data.Stat;
@ -596,11 +599,13 @@ public class ZKUtil {
ZooKeeperWatcher zkw, String baseNode) throws KeeperException { ZooKeeperWatcher zkw, String baseNode) throws KeeperException {
List<String> nodes = List<String> nodes =
ZKUtil.listChildrenAndWatchForNewChildren(zkw, baseNode); ZKUtil.listChildrenAndWatchForNewChildren(zkw, baseNode);
List<NodeAndData> newNodes = new ArrayList<NodeAndData>(); List<NodeAndData> newNodes = Collections.emptyList();
for (String node: nodes) { if (nodes != null) {
String nodePath = ZKUtil.joinZNode(baseNode, node); for (String node : nodes) {
byte [] data = ZKUtil.getDataAndWatch(zkw, nodePath); String nodePath = ZKUtil.joinZNode(baseNode, node);
newNodes.add(new NodeAndData(nodePath, data)); byte[] data = ZKUtil.getDataAndWatch(zkw, nodePath);
newNodes.add(new NodeAndData(nodePath, data));
}
} }
return newNodes; return newNodes;
} }

12
src/test/java/org/apache/hadoop/hbase/TestZooKeeper.java
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@ -342,6 +342,18 @@ public class TestZooKeeper {
ZKUtil.createAndFailSilent(zk2, aclZnode); ZKUtil.createAndFailSilent(zk2, aclZnode);
} }
@Test
/**
* Test should not fail with NPE when getChildDataAndWatchForNewChildren
* invoked with wrongNode
*/
public void testGetChildDataAndWatchForNewChildrenShouldNotThrowNPE()
throws Exception {
ZooKeeperWatcher zkw = new ZooKeeperWatcher(TEST_UTIL.getConfiguration(),
"testGetChildDataAndWatchForNewChildrenShouldNotThrowNPE", null);
ZKUtil.getChildDataAndWatchForNewChildren(zkw, "/wrongNode");
}
@org.junit.Rule @org.junit.Rule
public org.apache.hadoop.hbase.ResourceCheckerJUnitRule cu = public org.apache.hadoop.hbase.ResourceCheckerJUnitRule cu =