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

      String path = ZKAssign.getNodeName(zkw, hri.getEncodedName());
      Stat stats = zkw.getRecoverableZooKeeper().exists(path, false);
      LOG.info("EPHEMERAL NODE BEFORE SERVER ABORT, path=" + path + ", stats="
          + stats);
      byte[] bytes = ZKAssign.getData(zkw, hri.getEncodedName());
      RegionTransition rtd = RegionTransition.parseFrom(bytes);
      // State could be SPLIT or SPLITTING.
      assertTrue(rtd.getEventType().equals(EventType.RS_ZK_REGION_SPLIT)
          || rtd.getEventType().equals(EventType.RS_ZK_REGION_SPLITTING));


      // abort and wait for new master.
      MockMasterWithoutCatalogJanitor master = abortAndWaitForMaster();


      this.admin = new HBaseAdmin(TESTING_UTIL.getConfiguration());

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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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    regionsThatShouldBeOnline.add(region);
    ZKAssign.createNodeOffline(zkw, region, deadServerName);
    ProtobufUtil.openRegion(hrsDead, 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);
    }
    LOG.debug("\n\nRegion of enabled table was OPENED on dead RS\n" +
        region + "\n\n");


    // Region of disabled table was opened on dead RS
    region = disabledRegions.remove(0);
    regionsThatShouldBeOffline.add(region);
    ZKAssign.createNodeOffline(zkw, region, deadServerName);
    ProtobufUtil.openRegion(hrsDead, 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);
    }
    LOG.debug("\n\nRegion of disabled table was OPENED on dead RS\n" +
        region + "\n\n");


    /*
     * ZK = NONE
     */


    // Region of enabled table was open at steady-state on dead RS
    region = enabledRegions.remove(0);
    regionsThatShouldBeOnline.add(region);
    ZKAssign.createNodeOffline(zkw, region, deadServerName);
    ProtobufUtil.openRegion(hrsDead, 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)) {
        ZKAssign.deleteOpenedNode(zkw, region.getEncodedName());
        LOG.debug("DELETED " + rt);
        break;
      }
      Thread.sleep(100);
    }
    LOG.debug("\n\nRegion of enabled table was open at steady-state on dead RS"
        + "\n" + region + "\n\n");


    // Region of disabled table was open at steady-state on dead RS
    region = disabledRegions.remove(0);
    regionsThatShouldBeOffline.add(region);
    ZKAssign.createNodeOffline(zkw, region, deadServerName);
    ProtobufUtil.openRegion(hrsDead, 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)) {
        ZKAssign.deleteOpenedNode(zkw, region.getEncodedName());
        break;
      }
      Thread.sleep(100);
    }

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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.getTableName());
    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.getTableName());
    } else {
      am.getZKTable().setDisabledTable(REGIONINFO.getTableName());
    }
    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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      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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      final ServerName serverName, final HRegionInfo a,
      final HRegionInfo b) throws KeeperException, IOException {
    LOG.debug(zkw.prefix("Creating ephemeral node for "
        + region.getEncodedName() + " in MERGING state"));
    byte [] payload = HRegionInfo.toDelimitedByteArray(a, b);
    RegionTransition rt = RegionTransition.createRegionTransition(
        EventType.RS_ZK_REGION_MERGING, 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);
    }
    // Transition node from MERGING to MERGING and pick up version so we
    // can be sure this znode is ours; version is needed deleting.
    return transitionNodeMerging(zkw, region, serverName, -1, a, b);

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         new CloseRegionHandler(server, rss, hri, false, true,
         versionOfClosingNode+1);
       handler.process();
   
       // Handler should remain in M_ZK_REGION_CLOSING
       RegionTransition rt =
         RegionTransition.parseFrom(ZKAssign.getData(server.getZooKeeper(), hri.getEncodedName()));
       assertTrue(rt.getEventType().equals(EventType.M_ZK_REGION_CLOSING ));
     }

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       CloseRegionHandler handler =
         new CloseRegionHandler(server, rss, hri, false, true,
         versionOfClosingNode);
       handler.process();
       // Handler should have transitioned it to RS_ZK_REGION_CLOSED
       RegionTransition rt = RegionTransition.parseFrom(
         ZKAssign.getData(server.getZooKeeper(), hri.getEncodedName()));
       assertTrue(rt.getEventType().equals(EventType.RS_ZK_REGION_CLOSED));
     }

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Related Classes of org.apache.hadoop.hbase.RegionTransition

org.apache.hadoop.hbase.coordination.ZkRegionMergeCoordination

org.apache.hadoop.hbase.coordination.ZKSplitTransactionCoordination

org.apache.hadoop.hbase.master.AssignmentManager

org.apache.hadoop.hbase.master.Mocking

org.apache.hadoop.hbase.master.TestAssignmentManager

org.apache.hadoop.hbase.master.TestMasterFailover

org.apache.hadoop.hbase.regionserver.handler.TestCloseRegionHandler

org.apache.hadoop.hbase.regionserver.IndexSplitTransaction

org.apache.hadoop.hbase.regionserver.RegionMergeTransaction

org.apache.hadoop.hbase.regionserver.SplitTransaction

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