Examples of org.apache.hadoop.hbase.RegionTransition

org.apache.hadoop.hbase.RegionTransition
Current state of a region in transition. Holds state of a region as it moves through the steps that take it from offline to open, etc. Used by regionserver, master, and zk packages. Encapsulates protobuf serialization/deserialization so we don't leak generated pb outside this class. Create an instance using createRegionTransition(EventType, byte[], ServerName).
Immutable

      final ServerName serverName, final HRegionInfo a,
      final HRegionInfo b) throws KeeperException, IOException {
    LOG.debug(zkw.prefix("Creating ephemeral node for " +
      region.getEncodedName() + " in PENDING_SPLIT state"));
    byte [] payload = HRegionInfo.toDelimitedByteArray(a, b);
    RegionTransition rt = RegionTransition.createRegionTransition(
      RS_ZK_REQUEST_REGION_SPLIT, region.getRegionName(), serverName, payload);
    String node = ZKAssign.getNodeName(zkw, region.getEncodedName());
    if (!ZKUtil.createEphemeralNodeAndWatch(zkw, node, rt.toByteArray())) {
      throw new IOException("Failed create of ephemeral " + node);
    }
  }

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    Lock lock = locker.acquireLock(encodedRegionName);
    try {
      Stat stat = new Stat();
      byte [] data = ZKAssign.getDataAndWatch(watcher, encodedRegionName, stat);
      if (data == null) return false;
      RegionTransition rt;
      try {
        rt = RegionTransition.parseFrom(data);
      } catch (DeserializationException e) {
        LOG.warn("Failed parse znode data", e);
        return false;
      }
      HRegionInfo hri = regionInfo;
      if (hri == null) {
        // Get the region from region states map/meta. However, we
        // may still can't get it, for example, for online region merge,
        // the znode uses the new region to be created, which may not in meta
        // yet if the merging is still going on during the master recovery.
        hri = regionStates.getRegionInfo(rt.getRegionName());
        EventType et = rt.getEventType();
        if (hri == null && et != EventType.RS_ZK_REGION_MERGING
            && et != EventType.RS_ZK_REQUEST_REGION_MERGE) {
          LOG.warn("Couldn't find the region in recovering " + rt);
          return false;
        }

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          try {
            Stat stat = new Stat();
            byte [] data = ZKAssign.getDataAndWatch(watcher, path, stat);
            if (data == null) return;


            RegionTransition rt = RegionTransition.parseFrom(data);
            handleRegion(rt, stat.getVersion());
          } catch (KeeperException e) {
            server.abort("Unexpected ZK exception reading unassigned node data", e);
          } catch (DeserializationException e) {
            server.abort("Unexpected exception deserializing node data", e);

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    byte [] data = ZKAssign.getData(watcher, path);
    if (data == null) {
      LOG.info("Node " + path + " is gone");
      return false;
    }
    RegionTransition rt = RegionTransition.parseFrom(data);
    switch (rt.getEventType()) {
    case RS_ZK_REQUEST_REGION_SPLIT:
    case RS_ZK_REGION_SPLIT:
    case RS_ZK_REGION_SPLITTING:
    case RS_ZK_REQUEST_REGION_MERGE:
    case RS_ZK_REGION_MERGED:
    case RS_ZK_REGION_MERGING:
      result = true;
      break;
    default:
      LOG.info("Node " + path + " is in " + rt.getEventType());
      break;
    }
    return result;
  }

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      byte [] data = ZKAssign.getDataNoWatch(watcher, node, stat);
      if (data == null) {
        LOG.warn("Data is null, node " + node + " no longer exists");
        return;
      }
      RegionTransition rt = RegionTransition.parseFrom(data);
      EventType et = rt.getEventType();
      if (et == EventType.RS_ZK_REGION_OPENED) {
        LOG.debug("Region has transitioned to OPENED, allowing "
            + "watched event handlers to process");
        return;
      } else if (et != EventType.RS_ZK_REGION_OPENING && et != EventType.RS_ZK_REGION_FAILED_OPEN ) {

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   * The AM's info could be old when OpenedRegionHandler
   * processing hasn't finished yet when server shutdown occurs.
   * @return whether the serverName currently hosts the region
   */
  private boolean isCarryingRegion(ServerName serverName, HRegionInfo hri) {
    RegionTransition rt = null;
    try {
      byte [] data = ZKAssign.getData(watcher, hri.getEncodedName());
      // This call can legitimately come by null
      rt = data == null? null: RegionTransition.parseFrom(data);
    } catch (KeeperException e) {
      server.abort("Exception reading unassigned node for region=" + hri.getEncodedName(), e);
    } catch (DeserializationException e) {
      server.abort("Exception parsing unassigned node for region=" + hri.getEncodedName(), e);
    }


    ServerName addressFromZK = rt != null? rt.getServerName():  null;
    if (addressFromZK != null) {
      // if we get something from ZK, we will use the data
      boolean matchZK = addressFromZK.equals(serverName);
      LOG.debug("Checking region=" + hri.getRegionNameAsString() + ", zk server=" + addressFromZK +
        " current=" + serverName + ", matches=" + matchZK);

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            hri_a, hri_b, sn, -1, EventType.RS_ZK_REQUEST_REGION_MERGE,
            EventType.RS_ZK_REGION_MERGING) == -1) {
          byte[] data = ZKAssign.getData(watcher, encodedName);
          EventType currentType = null;
          if (data != null) {
            RegionTransition newRt = RegionTransition.parseFrom(data);
            currentType = newRt.getEventType();
          }
          if (currentType == null || (currentType != EventType.RS_ZK_REGION_MERGED
              && currentType != EventType.RS_ZK_REGION_MERGING)) {
            LOG.warn("Failed to transition pending_merge node "
              + encodedName + " to merging, it's now " + currentType);

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            hri_a, hri_b, sn, -1, EventType.RS_ZK_REQUEST_REGION_SPLIT,
            EventType.RS_ZK_REGION_SPLITTING) == -1) {
          byte[] data = ZKAssign.getData(watcher, encodedName);
          EventType currentType = null;
          if (data != null) {
            RegionTransition newRt = RegionTransition.parseFrom(data);
            currentType = newRt.getEventType();
          }
          if (currentType == null || (currentType != EventType.RS_ZK_REGION_SPLIT
              && currentType != EventType.RS_ZK_REGION_SPLITTING)) {
            LOG.warn("Failed to transition pending_split node "
              + encodedName + " to splitting, it's now " + currentType);

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    am.regionOnline(REGIONINFO, SERVERNAME_A);
    // adding region in pending close.
    am.getRegionStates().updateRegionState(
      REGIONINFO, State.SPLITTING, SERVERNAME_A);
    am.getZKTable().setEnabledTable(REGIONINFO.getTable());
    RegionTransition data = RegionTransition.createRegionTransition(EventType.RS_ZK_REGION_SPLITTING,
        REGIONINFO.getRegionName(), SERVERNAME_A);
    String node = ZKAssign.getNodeName(this.watcher, REGIONINFO.getEncodedName());
    // create znode in M_ZK_REGION_CLOSING state.
    ZKUtil.createAndWatch(this.watcher, node, data.toByteArray());


    try {
      processServerShutdownHandler(ct, am, regionSplitDone);
      // check znode deleted or not.
      // In both cases the znode should be deleted.

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    if (state == Table.State.DISABLING) {
      am.getZKTable().setDisablingTable(REGIONINFO.getTable());
    } else {
      am.getZKTable().setDisabledTable(REGIONINFO.getTable());
    }
    RegionTransition data = RegionTransition.createRegionTransition(EventType.M_ZK_REGION_CLOSING,
        REGIONINFO.getRegionName(), SERVERNAME_A);
    // RegionTransitionData data = new
    // RegionTransitionData(EventType.M_ZK_REGION_CLOSING,
    // REGIONINFO.getRegionName(), SERVERNAME_A);
    String node = ZKAssign.getNodeName(this.watcher, REGIONINFO.getEncodedName());
    // create znode in M_ZK_REGION_CLOSING state.
    ZKUtil.createAndWatch(this.watcher, node, data.toByteArray());


    try {
      processServerShutdownHandler(ct, am, false);
      // check znode deleted or not.
      // In both cases the znode should be deleted.

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