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

      this.server, this.serverManager);
    ZKAssign.createNodeOffline(this.watcher, REGIONINFO, SERVERNAME_A);
    int version = ZKAssign.getVersion(this.watcher, REGIONINFO);
    ZKAssign.transitionNode(this.watcher, REGIONINFO, SERVERNAME_A, EventType.M_ZK_REGION_OFFLINE,
        EventType.RS_ZK_REGION_OPENING, version);
    RegionTransition rt = RegionTransition.createRegionTransition(EventType.RS_ZK_REGION_OPENING,
        REGIONINFO.getRegionName(), SERVERNAME_A, HConstants.EMPTY_BYTE_ARRAY);
    version = ZKAssign.getVersion(this.watcher, REGIONINFO);
    Mockito.when(this.serverManager.isServerOnline(SERVERNAME_A)).thenReturn(false);
    am.getRegionStates().createRegionState(REGIONINFO);
    am.gate.set(false);

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  // Copied from SplitTransaction rather than open the method over there in
  // the regionserver package.
  private static int createNodeSplitting(final ZooKeeperWatcher zkw,
      final HRegionInfo region, final ServerName serverName)
  throws KeeperException, IOException {
    RegionTransition rt =
      RegionTransition.createRegionTransition(EventType.RS_ZK_REGION_SPLITTING,
        region.getRegionName(), serverName);


    String node = ZKAssign.getNodeName(zkw, region.getEncodedName());
    if (!ZKUtil.createEphemeralNodeAndWatch(zkw, node, rt.toByteArray())) {
      throw new IOException("Failed create of ephemeral " + node);
    }
    // Transition node from SPLITTING to SPLITTING and pick up version so we
    // can be sure this znode is ours; version is needed deleting.
    return transitionNodeSplitting(zkw, region, serverName, -1);

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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) {
        // The region info is not passed in. We will try to find the region
        // from region states map/meta based on the encoded region name. But we
        // may not be able to find it. This is valid for online merge that
        // the region may have not been created if the merge is not completed.
        // Therefore, it is not in meta at master recovery time.
        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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    regionsThatShouldBeOnline.add(region);
    ZKAssign.createNodeOffline(zkw, region, serverName);
    ProtobufUtil.openRegion(hrs, region);
    while (true) {
      byte [] bytes = ZKAssign.getData(zkw, region.getEncodedName());
      RegionTransition rt = RegionTransition.parseFrom(bytes);
      if (rt != null && rt.getEventType().equals(EventType.RS_ZK_REGION_OPENED)) {
        break;
      }
      Thread.sleep(100);
    }


    // Region of disable table was opened on RS
    // Cause: Master failed while updating the status for this region server.
    region = disabledRegions.remove(0);
    regionsThatShouldBeOffline.add(region);
    ZKAssign.createNodeOffline(zkw, region, serverName);
    ProtobufUtil.openRegion(hrs, region);
    while (true) {
      byte [] bytes = ZKAssign.getData(zkw, region.getEncodedName());
      RegionTransition rt = RegionTransition.parseFrom(bytes);
      if (rt != null && rt.getEventType().equals(EventType.RS_ZK_REGION_OPENED)) {
        break;
      }
      Thread.sleep(100);
    }

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org.apache.hadoop.hbase.coordination.ZKSplitTransactionCoordination

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