Examples of com.alibaba.wasp.ServerName

com.alibaba.wasp.ServerName
Instance of an Wasp ServerName. A server name is used uniquely identifying a server instance and is made of the combination of hostname, port, and startcode. The startcode distingushes restarted servers on same hostname and port (startcode is usually timestamp of server startup). The {@link #toString()} format of ServerName is safe to use in the filesystem andas znode name up in ZooKeeper. Its format is: <hostname> ' {@link #SERVERNAME_SEPARATOR}' <port> ' {@link #SERVERNAME_SEPARATOR}' <startcode> . For example, if hostname is example.org, port is 1234, and the startcode for the fserver is 1212121212, then the {@link #toString()} would beexample.org,1234,1212121212.
You can obtain a versioned serialized form of this class by calling {@link #getVersionedBytes()}. To deserialize, call {@link #parseVersionedServerName(byte[])}
Immutable.

        byte[] infoValue = r.getValue(FConstants.CATALOG_FAMILY,
            FConstants.EGINFO);
        byte[] locationValue = r.getValue(FConstants.CATALOG_FAMILY,
            FConstants.EGLOCATION);
        EntityGroupInfo key = EntityGroupInfo.parseFromOrNull(infoValue);
        ServerName value = ServerName.convert(locationValue);
        entityGroups.put(key, value);
      }
      for (int i = 0; i < egis.size(); i++) {
        ServerName sn = entityGroups.get(egis.get(i));
        assertEquals(sn.compareTo(egLocations[i]), 0);
      }


      // scanEntityGroupLocation
      byte[] row = Bytes.toBytes("20001");
      EntityGroupLocation egLocation = fMetaService.scanEntityGroupLocation(

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        TEST_UTIL.getConfiguration().get(HConstants.ZOOKEEPER_QUORUM));
    TEST_UTIL.getConfiguration().set(FConstants.ZOOKEEPER_CLIENT_PORT,
        TEST_UTIL.getConfiguration().get(HConstants.ZOOKEEPER_CLIENT_PORT));
    FMaster hm = new FMaster(conf);


    ServerName sm = hm.getServerName();
    InetSocketAddress isa = new InetSocketAddress(sm.getHostname(),
        sm.getPort());
    int i = 0;
    // retry the RPC a few times; we have seen SocketTimeoutExceptions if we
    // try to connect too soon. Retry on SocketTimeoutException.
    while (i < 20) {
      try {

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        list.size());
    for (ServerAndLoad sl : list) {
      map.put(sl.getServerName(), sl);
    }
    for (EntityGroupPlan plan : plans) {
      ServerName source = plan.getSource();
      updateLoad(map, source, -1);
      ServerName destination = plan.getDestination();
      updateLoad(map, destination, +1);
    }
    result.clear();
    result.addAll(map.values());
    return result;

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  private Queue<ServerName> serverQueue = new LinkedList<ServerName>();


  protected ServerAndLoad randomServer(final int numEntityGroupsPerServer) {
    if (!this.serverQueue.isEmpty()) {
      ServerName sn = this.serverQueue.poll();
      return new ServerAndLoad(sn, numEntityGroupsPerServer);
    }
    String host = "srv" + rand.nextInt(100000);
    int port = rand.nextInt(60000);
    long startCode = rand.nextLong();
    ServerName sn = new ServerName(host, port, startCode);
    return new ServerAndLoad(sn, numEntityGroupsPerServer);
  }

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    // not yet run, or from a server whose fail we are currently processing.
    // Test its host+port combo is present in serverAddresstoServerInfo. If it
    // is, reject the server and trigger its expiration. The next time it comes
    // in, it should have been removed from serverAddressToServerInfo and queued
    // for processing by ProcessServerShutdown.
    ServerName sn = new ServerName(ia.getHostName(), port, serverStartcode);
    checkClockSkew(sn, serverCurrentTime);
    checkIsDead(sn, "STARTUP");
    checkAlreadySameHostPort(sn);
    recordNewServer(sn, ServerLoad.EMPTY_SERVERLOAD);
    return sn;

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   * @param serverName
   * @throws com.alibaba.wasp.PleaseHoldException
   */
  void checkAlreadySameHostPort(final ServerName serverName)
      throws PleaseHoldException {
    ServerName existingServer = ServerName.findServerWithSameHostnamePort(
        getOnlineServersList(), serverName);
    if (existingServer != null) {
      String message = "Server serverName=" + serverName
          + " rejected; we already have " + existingServer.toString()
          + " registered with same hostname and port";
      LOG.info(message);
      if (existingServer.getStartcode() < serverName.getStartcode()) {
        LOG.info("Triggering server recovery; existingServer " + existingServer
            + " looks stale, new server:" + serverName);
        expireServer(existingServer);
      }
      // master has completed the initialization

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  /**
   * To clear any dead server with same host name and port of any online server
   */
  void clearDeadServersWithSameHostNameAndPortOfOnlineServer() {
    ServerName sn = null;
    for (ServerName serverName : getOnlineServersList()) {
      while ((sn = ServerName.findServerWithSameHostnamePort(this.deadservers,
          serverName)) != null) {
        this.deadservers.remove(sn);
      }

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            this.watcher.getMasterAddressZNode());
        if (bytes == null) {
          msg = ("A master was detected, but went down before its address "
              + "could be read.  Attempting to become the next active master");
        } else {
          ServerName currentMaster;
          try {
            currentMaster = ServerName.parseFrom(bytes);
          } catch (DeserializationException e) {
            LOG.warn("Failed parse", e);
            // Hopefully next time around we won't fail the parse. Dangerous.

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  }


  public void stop() {
    try {
      // If our address is in ZK, delete it on our way out
      ServerName activeMaster = null;
      try {
        activeMaster = MasterAddressTracker.getMasterAddress(this.watcher);
      } catch (IOException e) {
        LOG.warn("Failed get of master address: " + e.toString());
      }
      if (activeMaster != null && activeMaster.equals(this.sn)) {
        ZKUtil.deleteNode(watcher, watcher.getMasterAddressZNode());
        // We may have failed to delete the znode at the previous step, but
        // we delete the file anyway: a second attempt to delete the znode is
        // likely to fail again.
        ZNodeClearer.deleteMyEphemeralNodeOnDisk();

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   */
  public synchronized EntityGroupState updateEntityGroupState(
      final EntityGroupInfo egi, final EntityGroupState.State state) {
    EntityGroupState entityGroupState = entityGroupStates.get(egi
        .getEncodedName());
    ServerName serverName = (entityGroupState == null || state == EntityGroupState.State.CLOSED || state == EntityGroupState.State.OFFLINE) ? null
        : entityGroupState.getServerName();
    return updateEntityGroupState(egi, state, serverName);
  }

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