Examples of org.apache.hadoop.hbase.ServerName

org.apache.hadoop.hbase.ServerName
Instance of an HBase ServerName. A server name is used uniquely identifying a server instance in a cluster 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 and as znode nameup in ZooKeeper. Its format is: <hostname> ' {@link #SERVERNAME_SEPARATOR}' <port> ' {@link #SERVERNAME_SEPARATOR}' <startcode>. For example, if hostname is www.example.org, port is 1234, and the startcode for the regionserver is 1212121212, then the {@link #toString()} would be www.example.org,1234,1212121212.
You can obtain a versioned serialized form of this class by calling {@link #getVersionedBytes()}. To deserialize, call {@link #parseVersionedServerName(byte[])}
Immutable.

            table.getRegionLocations();
        List<TRegionInfo> results = new ArrayList<TRegionInfo>();
        for (Map.Entry<HRegionInfo, ServerName> entry :
            regionLocations.entrySet()) {
          HRegionInfo info = entry.getKey();
          ServerName serverName = entry.getValue();
          TRegionInfo region = new TRegionInfo();
          region.serverName = ByteBuffer.wrap(
              Bytes.toBytes(serverName.getHostname()));
          region.port = serverName.getPort();
          region.startKey = ByteBuffer.wrap(info.getStartKey());
          region.endKey = ByteBuffer.wrap(info.getEndKey());
          region.id = info.getRegionId();
          region.name = ByteBuffer.wrap(info.getRegionName());
          region.version = info.getVersion();

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      TableInfoModel model = new TableInfoModel(tableName);
      Map<HRegionInfo,ServerName> regions = MetaScanner.allTableRegions(
        servlet.getConfiguration(), null, Bytes.toBytes(tableName), false);
      for (Map.Entry<HRegionInfo,ServerName> e: regions.entrySet()) {
        HRegionInfo hri = e.getKey();
        ServerName addr = e.getValue();
        model.add(
          new TableRegionModel(tableName, hri.getRegionId(),
            hri.getStartKey(), hri.getEndKey(), addr.getHostAndPort()));
      }
      ResponseBuilder response = Response.ok(model);
      response.cacheControl(cacheControl);
      servlet.getMetrics().incrementSucessfulGetRequests(1);
      return response.build();

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  private void add(final List<String> servers) throws IOException {
    synchronized(this.regionServers) {
      this.regionServers.clear();
      for (String n: servers) {
        ServerName sn = ServerName.parseServerName(ZKUtil.getNodeName(n));
        if (regionServers.get(sn) == null) {
          RegionServerInfo.Builder rsInfoBuilder = RegionServerInfo.newBuilder();
          try {
            String nodePath = ZKUtil.joinZNode(watcher.rsZNode, n);
            byte[] data = ZKUtil.getData(watcher, nodePath);

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  public void nodeDeleted(String path) {
    if (path.startsWith(watcher.rsZNode)) {
      String serverName = ZKUtil.getNodeName(path);
      LOG.info("RegionServer ephemeral node deleted, processing expiration [" +
        serverName + "]");
      ServerName sn = ServerName.parseServerName(serverName);
      if (!serverManager.isServerOnline(sn)) {
        LOG.warn(serverName.toString() + " is not online or isn't known to the master."+
         "The latter could be caused by a DNS misconfiguration.");
        return;
      }

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    while (regionsToMove.size() > 0) {
      int cnt = 0;
      int i = incr > 0 ? 0 : underloadedServers.size()-1;
      for (; i >= 0 && i < underloadedServers.size(); i += incr) {
        if (regionsToMove.isEmpty()) break;
        ServerName si = sns.get(i);
        int numToTake = underloadedServers.get(si);
        if (numToTake == 0) continue;


        addRegionPlan(regionsToMove, fetchFromTail, si, regionsToReturn);
        if (emptyRegionServerPresent) {

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    if (numServers > 1) {
      serverIdx = RANDOM.nextInt(numServers);
    }
    int regionIdx = 0;
    for (int j = 0; j < numServers; j++) {
      ServerName server = servers.get((j + serverIdx) % numServers);
      List<HRegionInfo> serverRegions = new ArrayList<HRegionInfo>(max);
      for (int i=regionIdx; i<numRegions; i += numServers) {
        serverRegions.add(regions.get(i % numRegions));
      }
      assignments.put(server, serverRegions);

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    int numRandomAssignments = 0;
    int numRetainedAssigments = 0;
    for (Map.Entry<HRegionInfo, ServerName> entry : regions.entrySet()) {
      HRegionInfo region = entry.getKey();
      ServerName oldServerName = entry.getValue();
      List<ServerName> localServers = new ArrayList<ServerName>();
      if (oldServerName != null) {
        localServers = serversByHostname.get(oldServerName.getHostname());
      }
      if (localServers.isEmpty()) {
        // No servers on the new cluster match up with this hostname,
        // assign randomly.
        ServerName randomServer = servers.get(RANDOM.nextInt(servers.size()));
        assignments.get(randomServer).add(region);
        numRandomAssignments++;
        if (oldServerName != null) oldHostsNoLongerPresent.add(oldServerName.getHostname());
      } else if (localServers.size() == 1) {
        // the usual case - one new server on same host
        assignments.get(localServers.get(0)).add(region);
        numRetainedAssigments++;
      } else {
        // multiple new servers in the cluster on this same host
        int size = localServers.size();
        ServerName target = localServers.get(RANDOM.nextInt(size));
        assignments.get(target).add(region);
        numRetainedAssigments++;
      }
    }

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    for (ServerName sn : regionServers) {
      hostToServerName.put(sn.getHostname(), sn);
        }


    for (String host : hosts ) {
      ServerName sn = hostToServerName.get(host);
      // it is possible that HDFS is up ( thus host is valid ),
      // but RS is down ( thus sn is null )
      if (sn != null) {
        topServerNames.add(sn);
      }

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      regions = table.getRegionsInfo();
    } finally {
      table.close();
    }
    final Map.Entry<HRegionInfo, HServerAddress> firstRegion = regions.entrySet().iterator().next();
    final ServerName server = TEST_UTIL.getHBaseCluster().getRegionServer(0).getServerName();
    PrivilegedExceptionAction action = new PrivilegedExceptionAction() {
      public Object run() throws Exception {
        ACCESS_CONTROLLER.preMove(ObserverContext.createAndPrepare(CP_ENV, null),
          firstRegion.getKey(), server, server);
        return null;

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    ServerManager serverManager = ((HMaster) this.server).getServerManager();
    List<HRegionInfo> regions = new ArrayList<HRegionInfo>();
    RegionStates regionStates = this.assignmentManager.getRegionStates();
    for (Pair<HRegionInfo, ServerName> regionLocation : regionsInMeta) {
      HRegionInfo hri = regionLocation.getFirst();
      ServerName sn = regionLocation.getSecond();
      if (regionStates.isRegionOffline(hri)) {
        if (this.retainAssignment && sn != null && serverManager.isServerOnline(sn)) {
          this.assignmentManager.addPlan(hri.getEncodedName(), new RegionPlan(hri, null, sn));
        }
        regions.add(hri);

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