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.

   */
  private HRegionInterface getRS() throws IOException {
    if (this.currentPeers.size() == 0) {
      throw new IOException(this.peerClusterZnode + " has 0 region servers");
    }
    ServerName address =
        currentPeers.get(random.nextInt(this.currentPeers.size()));
    return this.conn.getHRegionConnection(address.getHostname(), address.getPort());
  }

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    final Map<HRegionInfo, ServerName> regionLocations = getRegionLocations();


    for (Map.Entry<HRegionInfo, ServerName> entry : regionLocations.entrySet()) {
      HServerAddress server = new HServerAddress();
      ServerName serverName = entry.getValue();
      if (serverName != null && serverName.getHostAndPort() != null) {
        server = new HServerAddress(Addressing.createInetSocketAddressFromHostAndPortStr(
            serverName.getHostAndPort()));
      }
      regionMap.put(entry.getKey(), server);
    }


    return regionMap;

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        Pair<HRegionInfo, ServerName> pair = MetaReader.getRegion(ct, regionname);
        if (pair == null || pair.getFirst() == null) {
          LOG.info("No region in .META. for " +
            Bytes.toStringBinary(regionname) + "; pair=" + pair);
        } else {
          closeRegion(new ServerName(serverName), pair.getFirst());
        }
      } else {
        Pair<HRegionInfo, ServerName> pair = MetaReader.getRegion(ct, regionname);
        if (pair == null || pair.getSecond() == null) {
          LOG.info("No server in .META. for " +

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    byte[] encodedRegionNameInBytes = Bytes.toBytes(encodedRegionName);
    if (null == serverName || ("").equals(serverName.trim())) {
      throw new IllegalArgumentException(
          "The servername cannot be null or empty.");
    }
    ServerName sn = new ServerName(serverName);
    HRegionInterface rs = this.connection.getHRegionConnection(
        sn.getHostname(), sn.getPort());
    // Close the region without updating zk state.
    boolean isRegionClosed = rs.closeRegion(encodedRegionNameInBytes, false);
    if (false == isRegionClosed) {
      LOG.error("Not able to close the region " + encodedRegionName + ".");
    }

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   * @throws IOException if a remote or network exception occurs
   * @throws FailedLogCloseException
   */
 public synchronized  byte[][] rollHLogWriter(String serverName)
      throws IOException, FailedLogCloseException {
    ServerName sn = new ServerName(serverName);
    HRegionInterface rs = this.connection.getHRegionConnection(
        sn.getHostname(), sn.getPort());
    return rs.rollHLogWriter();
  }

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          MetaReader.getRegion(ct, tableNameOrRegionName);
        if (pair == null || pair.getSecond() == null) {
          LOG.info("No server in .META. for " +
            Bytes.toStringBinary(tableNameOrRegionName) + "; pair=" + pair);
        } else {
          ServerName sn = pair.getSecond();
          HRegionInterface rs =
            this.connection.getHRegionConnection(sn.getHostname(), sn.getPort());
          return CompactionState.valueOf(
            rs.getCompactionState(pair.getFirst().getRegionName()));
        }
      } else {
        final String tableName = tableNameString(tableNameOrRegionName, ct);
        List<Pair<HRegionInfo, ServerName>> pairs =
          MetaReader.getTableRegionsAndLocations(ct, tableName);
        for (Pair<HRegionInfo, ServerName> pair: pairs) {
          if (pair.getFirst().isOffline()) continue;
          if (pair.getSecond() == null) continue;
          try {
            ServerName sn = pair.getSecond();
            HRegionInterface rs =
              this.connection.getHRegionConnection(sn.getHostname(), sn.getPort());
            switch (CompactionState.valueOf(
              rs.getCompactionState(pair.getFirst().getRegionName()))) {
            case MAJOR_AND_MINOR:
              return CompactionState.MAJOR_AND_MINOR;
            case MAJOR:

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    Set<ServerName> setOfAddr = new HashSet<ServerName>();
    int nbPeers = (int) (Math.ceil(addresses.size() * ratio));
    LOG.info("Getting " + nbPeers +
        " rs from peer cluster # " + peerId);
    for (int i = 0; i < nbPeers; i++) {
      ServerName sn;
      // Make sure we get one address that we don't already have
      do {
        sn = addresses.get(this.random.nextInt(addresses.size()));
      } while (setOfAddr.contains(sn));
      LOG.info("Choosing peer " + sn);

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   */
  private HRegionInterface getRS() throws IOException {
    if (this.currentPeers.size() == 0) {
      throw new IOException(this.peerClusterZnode + " has 0 region servers");
    }
    ServerName address =
        currentPeers.get(random.nextInt(this.currentPeers.size()));
    return this.conn.getHRegionConnection(address.getHostname(), address.getPort());
  }

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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.contains(oldServerName) ? oldServerName : localServers.get(RANDOM
                .nextInt(size));
        assignments.get(target).add(region);
        numRetainedAssigments++;
      }

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