Examples of org.apache.hadoop.hbase.master.RegionStates

org.apache.hadoop.hbase.master.RegionStates
Region state accountant. It holds the states of all regions in the memory. In normal scenario, it should match the meta table and the true region states. This map is used by AssignmentManager to track region states.

      meta.delete(new Delete(daughters.getFirst().getRegionName()));
      meta.delete(new Delete(daughters.getSecond().getRegionName()));
      meta.flushCommits();


      // Remove daughters from regionStates
      RegionStates regionStates = TEST_UTIL.getMiniHBaseCluster().getMaster().
        getAssignmentManager().getRegionStates();
      regionStates.deleteRegion(daughters.getFirst());
      regionStates.deleteRegion(daughters.getSecond());


      HBaseFsck hbck = doFsck(conf, false);
      assertErrors(hbck, new ERROR_CODE[] {ERROR_CODE.NOT_IN_META_OR_DEPLOYED,
          ERROR_CODE.NOT_IN_META_OR_DEPLOYED, ERROR_CODE.HOLE_IN_REGION_CHAIN}); //no LINGERING_SPLIT_PARENT

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      Thread.sleep(500);
    }


    // Now open the region again.
    HMaster master = cluster.getMaster();
    RegionStates states = master.getAssignmentManager().getRegionStates();
    states.regionOffline(hri);
    states.updateRegionState(hri, State.OPENING);
    ProtobufUtil.openRegion(rs.getRSRpcServices(), rs.getServerName(), hri);
    startTime = EnvironmentEdgeManager.currentTime();
    while (true) {
      if (rs.getOnlineRegion(regionName) != null) {
        break;

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    // Randomly choose one of the two merged regions
    HRegionInfo hri = RandomUtils.nextBoolean() ?
      mergedRegions.getFirst() : mergedRegions.getSecond();
    MiniHBaseCluster cluster = TEST_UTIL.getHBaseCluster();
    AssignmentManager am = cluster.getMaster().getAssignmentManager();
    RegionStates regionStates = am.getRegionStates();
    long start = EnvironmentEdgeManager.currentTime();
    while (!regionStates.isRegionInState(hri, State.MERGED)) {
      assertFalse("Timed out in waiting one merged region to be in state MERGED",
        EnvironmentEdgeManager.currentTime() - start > 60000);
      Thread.sleep(500);
    }


    // We should not be able to assign it again
    am.assign(hri, true);
    assertFalse("Merged region can't be assigned",
      regionStates.isRegionInTransition(hri));
    assertTrue(regionStates.isRegionInState(hri, State.MERGED));


    // We should not be able to unassign it either
    am.unassign(hri, null);
    assertFalse("Merged region can't be unassigned",
      regionStates.isRegionInTransition(hri));
    assertTrue(regionStates.isRegionInState(hri, State.MERGED));


    table.close();
  }

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    final TableName tableName = TableName.valueOf("testMerge");


    try {
      // Create table and load data.
      Table table = createTableAndLoadData(master, tableName);
      RegionStates regionStates = master.getAssignmentManager().getRegionStates();
      List<HRegionInfo> regions = regionStates.getRegionsOfTable(tableName);
      // Fake offline one region
      HRegionInfo a = regions.get(0);
      HRegionInfo b = regions.get(1);
      regionStates.regionOffline(a);
      try {
        // Merge offline region. Region a is offline here
        admin.mergeRegions(a.getEncodedNameAsBytes(), b.getEncodedNameAsBytes(), false);
        fail("Offline regions should not be able to merge");
      } catch (IOException ie) {

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    public ReportRegionStateTransitionResponse reportRegionStateTransition(RpcController c,
        ReportRegionStateTransitionRequest req) throws ServiceException {
      ReportRegionStateTransitionResponse resp = super.reportRegionStateTransition(c, req);
      if (enabled.get() && req.getTransition(0).getTransitionCode()
          == TransitionCode.READY_TO_MERGE && !resp.hasErrorMessage()) {
        RegionStates regionStates = myMaster.getAssignmentManager().getRegionStates();
        for (RegionState regionState: regionStates.getRegionsInTransition().values()) {
          // Find the merging_new region and remove it
          if (regionState.isMergingNew()) {
            regionStates.deleteRegion(regionState.getRegion());
          }
        }
      }
      return resp;
    }

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    forceRegionsOffline(metaChanges.getRegionsToRemove());
  }


  private void forceRegionsOffline(final List<HRegionInfo> hris) {
    AssignmentManager am = this.masterServices.getAssignmentManager();
    RegionStates states = am.getRegionStates();
    if (hris != null) {
      for (HRegionInfo hri: hris) {
        states.regionOffline(hri);
      }
    }
  }

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        synchronized (this.colocationInfo) {
            if (!isTableColocated(table)) {
                throw new IllegalArgumentException("Specified table " + table
                        + " should be in one of the tables to co-locate.");
            }
            RegionStates regionStates = this.master.getAssignmentManager().getRegionStates();
            List<HRegionInfo> onlineRegions = regionStates.getRegionsOfTable(table);
            for (HRegionInfo hri : onlineRegions) {
                regionOnline(hri, regionStates.getRegionServerOfRegion(hri));
            }
            Map<String, RegionState> regionsInTransition = regionStates.getRegionsInTransition();
            for (RegionState regionState : regionsInTransition.values()) {
                if (table.equals(regionState.getRegion().getTable())
                        && regionState.getServerName() != null) {
                    regionOnline(regionState.getRegion(), regionState.getServerName());
                }

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    @Test(timeout = 180000)
    public void testColocationAfterRegionsMerge() throws Exception {
        MiniHBaseCluster cluster = UTIL.getHBaseCluster();
        HMaster master = cluster.getMaster();
        RegionStates regionStates = master.getAssignmentManager().getRegionStates();
        // Table names to make use of the
        TableName tableName = TableName.valueOf("testColocationAfterRegionsMerge");
        TableName indexTableName = TableName.valueOf("testColocationAfterRegionsMerge_index");
        createUserAndIndexTable(tableName, indexTableName);
        ServerName server = cluster.getRegionServer(0).getServerName();
        List<HRegionInfo> regionsOfUserTable = regionStates.getRegionsOfTable(tableName);
        Pair<HRegionInfo, HRegionInfo> regionsToMerge = new Pair<HRegionInfo, HRegionInfo>();
        byte[] startKey1 = { (byte) 'C' };
        byte[] startKey2 = { (byte) 'D' };
        for (HRegionInfo region : regionsOfUserTable) {
            if (Bytes.compareTo(startKey1, region.getStartKey()) == 0) {
                regionsToMerge.setFirst(region);
            } else if (Bytes.compareTo(startKey2, region.getStartKey()) == 0) {
                regionsToMerge.setSecond(region);
            }
        }
        admin.move(regionsToMerge.getFirst().getEncodedNameAsBytes(), Bytes.toBytes(server
                .toString()));
        admin.move(regionsToMerge.getSecond().getEncodedNameAsBytes(), Bytes.toBytes(server
                .toString()));


        List<HRegionInfo> regionsOfIndexTable = regionStates.getRegionsOfTable(indexTableName);
        Pair<HRegionInfo, HRegionInfo> indexRegionsToMerge = new Pair<HRegionInfo, HRegionInfo>();
        for (HRegionInfo region : regionsOfIndexTable) {
            if (Bytes.compareTo(startKey1, region.getStartKey()) == 0) {
                indexRegionsToMerge.setFirst(region);
            } else if (Bytes.compareTo(startKey2, region.getStartKey()) == 0) {
                indexRegionsToMerge.setSecond(region);
            }
        }
        admin.move(indexRegionsToMerge.getFirst().getEncodedNameAsBytes(), Bytes.toBytes(server
                .toString()));
        admin.move(indexRegionsToMerge.getSecond().getEncodedNameAsBytes(), Bytes.toBytes(server
                .toString()));
        while (!regionStates.getRegionServerOfRegion(regionsToMerge.getFirst()).equals(server)
                || !regionStates.getRegionServerOfRegion(regionsToMerge.getSecond()).equals(server)
                || !regionStates.getRegionServerOfRegion(indexRegionsToMerge.getFirst()).equals(
                    server)
                || !regionStates.getRegionServerOfRegion(indexRegionsToMerge.getSecond()).equals(
                    server)) {
            Threads.sleep(1000);
        }
        admin.mergeRegions(regionsToMerge.getFirst().getEncodedNameAsBytes(), regionsToMerge
                .getSecond().getEncodedNameAsBytes(), true);
        admin.mergeRegions(indexRegionsToMerge.getFirst().getEncodedNameAsBytes(),
            indexRegionsToMerge.getSecond().getEncodedNameAsBytes(), true);


        while (regionsOfUserTable.size() != 20 || regionsOfIndexTable.size() != 20) {
            Thread.sleep(100);
            regionsOfUserTable = regionStates.getRegionsOfTable(tableName);
            regionsOfIndexTable = regionStates.getRegionsOfTable(indexTableName);
        }
        boolean isRegionColocated =
                checkForColocation(master, tableName.getNameAsString(), indexTableName
                        .getNameAsString());
        assertTrue("User regions and index regions should colocate.", isRegionColocated);

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      for (int i=0; !firstSplitCompleted && i<100; i++) {
        Thread.sleep(100);
      }
      assertTrue("fist split did not complete", firstSplitCompleted);


      RegionStates regionStates = cluster.getMaster().getAssignmentManager().getRegionStates();
      Map<String, RegionState> rit = regionStates.getRegionsInTransition();


      for (int i=0; rit.containsKey(hri.getTable()) && i<100; i++) {
        Thread.sleep(100);
      }
      assertFalse("region still in transition", rit.containsKey(

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      LOG.info("Waiting for region to come out of RIT");
      TESTING_UTIL.waitFor(60000, 1000, new Waiter.Predicate<Exception>() {
        @Override
        public boolean evaluate() throws Exception {
          RegionStates regionStates = cluster.getMaster().getAssignmentManager().getRegionStates();
          Map<String, RegionState> rit = regionStates.getRegionsInTransition();
          return !rit.containsKey(hri.getEncodedName());
        }
      });
    } finally {
      admin.setBalancerRunning(true, false);

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