Package org.apache.zookeeper.data

Examples of org.apache.zookeeper.data.Stat

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   * @throws KeeperException if unexpected zookeeper exception
   */
  public static int getNumberOfChildren(ZooKeeperWatcher zkw, String znode)
  throws KeeperException {
    try {
      Stat stat = zkw.getRecoverableZooKeeper().exists(znode, null);
      return stat == null ? 0 : stat.getNumChildren();
    } catch(KeeperException e) {
      LOG.warn(zkw.prefix("Unable to get children of node " + znode));
      zkw.keeperException(e);
    } catch(InterruptedException e) {
      zkw.interruptedException(e);
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    LOG.info("Region has been OPENING for too " + "long, reassigning region="
        + regionInfo.getRegionNameAsString());
    // Should have a ZK node in OPENING state
    try {
      String node = ZKAssign.getNodeName(watcher, regionInfo.getEncodedName());
      Stat stat = new Stat();
      RegionTransitionData dataInZNode = ZKAssign.getDataNoWatch(watcher, node,
          stat);
      if (dataInZNode == null) {
        LOG.warn("Data is null, node " + node + " no longer exists");
        return;
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   * @throws KeeperException if unexpected zookeeper exception
   */
  public static boolean watchAndCheckExists(ZooKeeperWatcher zkw, String znode)
  throws KeeperException {
    try {
      Stat s = zkw.getRecoverableZooKeeper().exists(znode, zkw);
      boolean exists = s != null ? true : false;
      if (exists) {
        LOG.debug(zkw.prefix("Set watcher on existing znode " + znode));
      } else {
        LOG.debug(zkw.prefix(znode+" does not exist. Watcher is set."));
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   * @throws KeeperException if unexpected zookeeper exception
   */
  public static int checkExists(ZooKeeperWatcher zkw, String znode)
  throws KeeperException {
    try {
      Stat s = zkw.getRecoverableZooKeeper().exists(znode, null);
      return s != null ? s.getVersion() : -1;
    } catch (KeeperException e) {
      LOG.warn(zkw.prefix("Unable to set watcher on znode (" + znode + ")"), e);
      zkw.keeperException(e);
      return -1;
    } catch (InterruptedException e) {
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            retryOrThrow(retryCounter, e, "setData");
            break;
          case BADVERSION:
            // try to verify whether the previous setData success or not
            try{
              Stat stat = new Stat();
              byte[] revData = zk.getData(path, false, stat);
              if (Bytes.equals(revData, newData)) {
                // the bad version is caused by previous successful setData
                return stat;
              }
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    List<String> nodes = zk.getChildren(parent, false);
    List<String> matching = filterByPrefix(nodes, nodePrefix);
    for (String node : matching) {
      String nodePath = parent + "/" + node;
      Stat stat = zk.exists(nodePath, false);
      if (stat != null) {
        return nodePath;
      }
    }
    return null;
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   */
  boolean processRegionInTransition(final String encodedRegionName,
      final HRegionInfo regionInfo,
      final Map<ServerName,List<Pair<HRegionInfo,Result>>> deadServers)
  throws KeeperException, IOException {
    Stat stat = new Stat();
    RegionTransitionData data = ZKAssign.getDataAndWatch(watcher,
        encodedRegionName, stat);
    if (data == null) return false;
    HRegionInfo hri = regionInfo;
    if (hri == null) {
      if ((hri = getHRegionInfo(data)) == null) return false;
    }
    processRegionsInTransition(data, hri, deadServers, stat.getVersion());
    return true;
  }
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   */
  @Override
  public void nodeCreated(String path) {
    if(path.startsWith(watcher.assignmentZNode)) {
      try {
        Stat stat = new Stat();
        RegionTransitionData data = ZKAssign.getDataAndWatch(watcher, path, stat);
        if (data == null) {
          return;
        }
        handleRegion(data, stat.getVersion());
      } catch (KeeperException e) {
        master.abort("Unexpected ZK exception reading unassigned node data", e);
      }
    }
  }
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   */
  @Override
  public void nodeDataChanged(String path) {
    if(path.startsWith(watcher.assignmentZNode)) {
      try {
        Stat stat = new Stat();
        RegionTransitionData data = ZKAssign.getDataAndWatch(watcher, path, stat);
        if (data == null) {
          return;
        }
        handleRegion(data, stat.getVersion());
      } catch (KeeperException e) {
        master.abort("Unexpected ZK exception reading unassigned node data", e);
      }
    }
  }
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    if(path.equals(watcher.assignmentZNode)) {
      try {
        List<String> children = ZKUtil.listChildrenAndWatchForNewChildren(watcher,
            watcher.assignmentZNode);
        if (children != null) {
          Stat stat = new Stat();
          for (String child : children) {
            stat.setVersion(0);
            RegionTransitionData data = ZKAssign.getDataAndWatch(watcher,
                ZKUtil.joinZNode(watcher.assignmentZNode, child), stat);
            // See HBASE-7551, handle splitting here as well, in case we miss the node change event
            if (stat.getVersion() > 0 && data.getEventType() == EventType.RS_ZK_REGION_SPLITTING) {
              handleRegion(data, stat.getVersion());
            }
          }
        }
      } catch(KeeperException e) {
        master.abort("Unexpected ZK exception reading unassigned children", e);
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