Examples of org.apache.hadoop.hbase.zookeeper.MetaTableLocator

Package org.apache.hadoop.hbase.zookeeper

Examples of org.apache.hadoop.hbase.zookeeper.MetaTableLocator

org.apache.hadoop.hbase.zookeeper.MetaTableLocator
Utility class to perform operation (get/wait for/verify/set/delete) on znode in ZooKeeper which keeps hbase:meta region server location. Stateless class with a bunch of static methods. Doesn't manage resources passed in (e.g. HConnection, ZooKeeperWatcher etc). Meta region location is set by RegionServerServices. This class doesn't use ZK watchers, rather accesses ZK directly. This class it stateless. The only reason it's not made a non-instantiable util class with a collection of static methods is that it'd be rather hard to mock properly in tests. TODO: rewrite using RPC calls to master to find out about hbase:meta.

    }


    synchronized (this) {
      if (shortCircuitConnection == null) {
        shortCircuitConnection = createShortCircuitConnection();
        metaTableLocator = new MetaTableLocator();
      }
    }


    // watch for snapshots and other procedures
    try {

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  private ServerName getMetaRegionServerName()
  throws IOException, KeeperException {
    ZooKeeperWatcher zkw = createZooKeeperWatcher();
    ServerName sn = null;
    try {
      sn = new MetaTableLocator().getMetaRegionLocation(zkw);
    } finally {
      zkw.close();
    }
    return sn;
  }

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    this.serverManager = createServerManager(this, this);


    synchronized (this) {
      if (shortCircuitConnection == null) {
        shortCircuitConnection = createShortCircuitConnection();
        metaTableLocator = new MetaTableLocator();
      }
    }


    // Invalidate all write locks held previously
    this.tableLockManager.reapWriteLocks();

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      ZooKeeperWatcher zkw, HConnection hConnection, final TableName tableName,
      final boolean excludeOfflinedSplitParents) throws IOException, InterruptedException {


    if (tableName.equals(TableName.META_TABLE_NAME)) {
      // If meta, do a bit of special handling.
      ServerName serverName = new MetaTableLocator().getMetaRegionLocation(zkw);
      List<Pair<HRegionInfo, ServerName>> list =
        new ArrayList<Pair<HRegionInfo, ServerName>>();
      list.add(new Pair<HRegionInfo, ServerName>(HRegionInfo.FIRST_META_REGIONINFO,
        serverName));
      return list;

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    try {
      if (LOG.isTraceEnabled()) {
        LOG.trace("Looking up meta region location in ZK," + " connection=" + this);
      }
      ServerName servername = new MetaTableLocator().blockUntilAvailable(zkw, hci.rpcTimeout);
      if (LOG.isTraceEnabled()) {
        LOG.trace("Looked up meta region location, connection=" + this +
          "; serverName=" + ((servername == null) ? "null" : servername));
      }
      if (servername == null) return null;

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    tmpl.render(response.getWriter(),
          master, admin);
  }


  private ServerName getMetaLocationOrNull(HMaster master) {
    MetaTableLocator metaTableLocator = master.getMetaTableLocator();
    return metaTableLocator == null ? null :
      metaTableLocator.getMetaRegionLocation(master.getZooKeeper());
  }

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      if (admin != null) {
        admin.close();
      }
    }
    regionStates.regionOffline(HRegionInfo.FIRST_META_REGIONINFO);
    new MetaTableLocator().deleteMetaLocation(cluster.getMaster().getZooKeeper());
    assertFalse(regionStates.isRegionOnline(HRegionInfo.FIRST_META_REGIONINFO));
    HBaseFsck hbck = doFsck(conf, true);
    assertErrors(hbck, new ERROR_CODE[] { ERROR_CODE.UNKNOWN, ERROR_CODE.NO_META_REGION,
        ERROR_CODE.NULL_META_REGION });
    assertNoErrors(doFsck(conf, false));

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  @After public void after() {
    try {
      // Clean out meta location or later tests will be confused... they presume
      // start fresh in zk.
      new MetaTableLocator().deleteMetaLocation(this.watcher);
    } catch (KeeperException e) {
      LOG.warn("Unable to delete hbase:meta location", e);
    }


    // Clear out our doctored connection or could mess up subsequent tests.

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      Mockito.mock(ClientProtos.ClientService.BlockingInterface.class);


    Mockito.when(client.get((RpcController)Mockito.any(), (GetRequest)Mockito.any())).
    thenReturn(GetResponse.newBuilder().build());


    final MetaTableLocator mtl = new MetaTableLocator();
    ServerName meta = new MetaTableLocator().getMetaRegionLocation(this.watcher);
    Assert.assertNull(meta);
    Thread t = new Thread() {
      @Override
      public void run() {
        try {
          mtl.waitMetaRegionLocation(watcher);
        } catch (InterruptedException e) {
          throw new RuntimeException("Interrupted", e);
        }
      }
    };
    t.start();
    while (!t.isAlive())
      Threads.sleep(1);
    Threads.sleep(1);
    assertTrue(t.isAlive());
    mtl.stop();
    // Join the thread... should exit shortly.
    t.join();
  }

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      thenThrow(new ServiceException(ex));


    MetaTableLocator.setMetaLocation(this.watcher, SN);
    long timeout = UTIL.getConfiguration().
      getLong("hbase.catalog.verification.timeout", 1000);
    Assert.assertFalse(new MetaTableLocator().verifyMetaRegionLocation(
      connection, watcher, timeout));
  }

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