Method handleRootZnode

src/HBaseClient.java:4414–4483

Returns a new client for the RS found in the root-region-server.

(final byte[] data)

      /** Returns a new client for the RS found in the root-region-server.  */
      @SuppressWarnings("fallthrough")
      protected RegionClient handleRootZnode(final byte[] data) {
        // There are 3 cases.  Older versions of HBase encode the location
        // of the root region as "host:port", 0.91 uses "host,port,startcode"
        // and newer versions of 0.91 use "<metadata>host,port,startcode"
        // where the <metadata> starts with MAGIC, then a 4 byte integer,
        // then that many bytes of meta data.
        boolean newstyle;     // True if we expect a 0.91 style location.
        final short offset;   // Bytes to skip at the beginning of data.
        short firstsep = -1;  // Index of the first separator (':' or ',').
        if (data[0] == MAGIC) {
          newstyle = true;
          final int metadata_length = Bytes.getInt(data, 1);
          if (metadata_length < 1 || metadata_length > 65000) {
            LOG.error("Malformed meta-data in " + Bytes.pretty(data)
                      + ", invalid metadata length=" + metadata_length);
            return null;  // TODO(tsuna): Add a watch to wait until the file changes.
          }
          offset = (short) (1 + 4 + metadata_length);
        } else {
          newstyle = false;  // Maybe true, the loop below will tell us.
          offset = 0;
        }
        final short n = (short) data.length;
        // Look for the first separator.  Skip the offset, and skip the
        // first byte, because we know the separate can only come after
        // at least one byte.
        loop: for (short i = (short) (offset + 1); i < n; i++) {
           switch (data[i]) {
            case ',':
              newstyle = true;
              /* fall through */
            case ':':
              firstsep = i;
              break loop;
          }
        }
        if (firstsep == -1) {
          LOG.error("-ROOT- location doesn't contain a separator"
                    + " (':' or ','): " + Bytes.pretty(data));
          return null;  // TODO(tsuna): Add a watch to wait until the file changes.
        }
        final String host;
        final short portend;  // Index past where the port number ends.
        if (newstyle) {
          host = new String(data, offset, firstsep - offset);
          short i;
          for (i = (short) (firstsep + 2); i < n; i++) {
            if (data[i] == ',') {
              break;
            }
          }
          portend = i;  // Port ends on the comma.
        } else {
          host = new String(data, 0, firstsep);
          portend = n;  // Port ends at the end of the array.
        }
        final int port = parsePortNumber(new String(data, firstsep + 1,