Examples of org.apache.hadoop.hbase.RegionLocations

org.apache.hadoop.hbase.RegionLocations
Container for holding a list of {@link HRegionLocation}'s that correspond to the same range. The list is indexed by the replicaId. This is an immutable list, however mutation operations are provided which returns a new List via copy-on-write (assuming small number of locations)

        public boolean processRow(Result result) throws IOException {
          if (result == null || result.isEmpty()) {
            return true;
          }


          RegionLocations locations = MetaTableAccessor.getRegionLocations(result);
          if (locations == null) return true;
          for (HRegionLocation loc : locations.getRegionLocations()) {
            if (loc != null) {
              HRegionInfo regionInfo = loc.getRegionInfo();
              // If region offline AND we are not to include offlined regions, return.
              if (regionInfo.isOffline() && !offlined) continue;
              regions.add(regionInfo);

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    final NavigableMap<HRegionInfo, ServerName> regions =
      new TreeMap<HRegionInfo, ServerName>();
    MetaScannerVisitor visitor = new TableMetaScannerVisitor(tableName) {
      @Override
      public boolean processRowInternal(Result result) throws IOException {
        RegionLocations locations = MetaTableAccessor.getRegionLocations(result);
        if (locations == null) return true;
        for (HRegionLocation loc : locations.getRegionLocations()) {
          if (loc != null) {
            HRegionInfo regionInfo = loc.getRegionInfo();
            regions.put(new UnmodifyableHRegionInfo(regionInfo), loc.getServerName());
          }
        }

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      ClusterConnection connection, final TableName tableName) throws IOException {
    final List<RegionLocations> regions = new ArrayList<RegionLocations>();
    MetaScannerVisitor visitor = new TableMetaScannerVisitor(tableName) {
      @Override
      public boolean processRowInternal(Result result) throws IOException {
        RegionLocations locations = MetaTableAccessor.getRegionLocations(result);
        if (locations == null) return true;
        regions.add(locations);
        return true;
      }
    };

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        HConstants.LATEST_TIMESTAMP), HConstants.LATEST_TIMESTAMP);
    Assert.assertEquals(conn.getCachedLocation(TABLE_NAME, ROW)
      .getRegionLocation().getPort(), nextPort);


    conn.clearRegionCache(TABLE_NAME, ROW.clone());
    RegionLocations rl = conn.getCachedLocation(TABLE_NAME, ROW);
    assertNull("What is this location?? " + rl, rl);


    // We're now going to move the region and check that it works for the client
    // First a new put to add the location in the cache
    conn.clearRegionCache(TABLE_NAME);

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      for (HRegionInfo region : regions) {
        HRegionLocation[] arr = new HRegionLocation[regionReplication];
        for (int i = 0; i < arr.length; i++) {
          arr[i] = new HRegionLocation(RegionReplicaUtil.getRegionInfoForReplica(region, i), null);
        }
        regionLocations.add(new RegionLocations(arr));
      }


      HTable table = spy(new HTable(TEST_UTIL.getConfiguration(), htd.getTableName()));
      when(table.listRegionLocations()).thenReturn(regionLocations);

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      }


      List<Result> metaRows = MetaTableAccessor.fullScanOfMeta(admin.getConnection());
      int numRows = 0;
      for (Result result : metaRows) {
        RegionLocations locations = MetaTableAccessor.getRegionLocations(result);
        HRegionInfo hri = locations.getRegionLocation().getRegionInfo();
        if (!hri.getTable().equals(table)) continue;
        numRows += 1;
        HRegionLocation[] servers = locations.getRegionLocations();
        // have two locations for the replicas of a region, and the locations should be different
        assert(servers.length == 2);
        assert(!servers[0].equals(servers[1]));
      }
      assert(numRows == numRegions);

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    public void init(Connection connection) {
    }


    @Override
    public RegionLocations getMetaRegionLocation() throws IOException {
      return new RegionLocations(
        new HRegionLocation(HRegionInfo.FIRST_META_REGIONINFO, META_HOST));
    }

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    Assert.assertTrue(start + 100L + sleepTime > end);
  }


  private static ClusterConnection createHConnection() throws IOException {
    ClusterConnection hc = createHConnectionCommon();
    setMockLocation(hc, DUMMY_BYTES_1, new RegionLocations(loc1));
    setMockLocation(hc, DUMMY_BYTES_2, new RegionLocations(loc2));
    setMockLocation(hc, DUMMY_BYTES_3, new RegionLocations(loc3));
    setMockLocation(hc, FAILS, new RegionLocations(loc2));
    return hc;
  }

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        LOG.trace("Looked up meta region location, connection=" + this +
          "; serverName=" + ((servername == null) ? "null" : servername));
      }
      if (servername == null) return null;
      HRegionLocation loc = new HRegionLocation(HRegionInfo.FIRST_META_REGIONINFO, servername, 0);
      return new RegionLocations(new HRegionLocation[] {loc});
    } catch (InterruptedException e) {
      Thread.currentThread().interrupt();
      return null;
    } finally {
      zkw.close();

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    }


    @Override
    public RegionLocations locateRegion(TableName tableName,
        byte[] row, boolean useCache, boolean retry, int replicaId) throws IOException {
      return new RegionLocations(loc1);
    }

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