コード例 #1
0
  private synchronized void getZkRunning() throws Exception {
    LOG.debug("Reading " + parentZnode + Constants.DEFAULT_ZOOKEEPER_ZNODE_SERVERS_RUNNING);
    List<String> children =
        getChildren(
            parentZnode + Constants.DEFAULT_ZOOKEEPER_ZNODE_SERVERS_RUNNING, new RunningWatcher());

    if (!children.isEmpty()) {
      for (String child : children) {
        // If stop-wms.sh is executed and WMS_MANAGES_ZK then zookeeper
        // is stopped abruptly.
        // Second scenario is when ZooKeeper fails for some reason
        // regardless of whether WMS
        // manages it. When either happens the WmsServer running znodes
        // still exist in ZooKeeper
        // and we see them at next startup. When they eventually timeout
        // we get node deleted events for a server that no longer
        // exists. So, only recognize
        // WmsServer running znodes that have timestamps after last
        // WmsMaster startup.
        Scanner scn = new Scanner(child);
        scn.useDelimiter(":");
        String hostName = scn.next();
        String instance = scn.next();
        int infoPort = Integer.parseInt(scn.next());
        long serverStartTimestamp = Long.parseLong(scn.next());
        scn.close();

        if (serverStartTimestamp < startupTimestamp) continue;

        if (!runningServers.contains(child)) {
          LOG.debug("Watching running [" + child + "]");
          zkc.exists(
              parentZnode + Constants.DEFAULT_ZOOKEEPER_ZNODE_SERVERS_RUNNING + "/" + child,
              new RunningWatcher());
          runningServers.add(child);
        }
      }
      metrics.setTotalRunning(runningServers.size());
    } else {
      metrics.setTotalRunning(0);
    }
  }
コード例 #2
0
  private synchronized void restartServer(String znodePath) throws Exception {
    String child =
        znodePath.replace(
            parentZnode + Constants.DEFAULT_ZOOKEEPER_ZNODE_SERVERS_RUNNING + "/", "");
    Scanner scn = new Scanner(child);
    scn.useDelimiter(":");
    String hostName = scn.next();
    String instance = scn.next();
    int infoPort = Integer.parseInt(scn.next());
    long serverStartTimestamp = Long.parseLong(scn.next());
    scn.close();

    LOG.error("WmsServer [" + hostName + ":" + instance + "] failed.");

    if (runningServers.contains(child)) {
      LOG.debug("Found [" + child + "], deleting from running servers list");
      runningServers.remove(child);
      metrics.setTotalRunning(runningServers.size());
    }

    RestartHandler handler = new RestartHandler(child);
    restartQueue.add(handler);
  }