Examples of org.apache.hadoop.hbase.client.HTable

org.apache.hadoop.hbase.client.HTable

Used to communicate with a single HBase table.
This class is not thread safe for reads nor write.
In case of writes (Put, Delete), the underlying write buffer can be corrupted if multiple threads contend over a single HTable instance.
In case of reads, some fields used by a Scan are shared among all threads. The HTable implementation can either not contract to be safe in case of a Get
To access a table in a multi threaded environment, please consider using the {@link HTablePool} class to create your HTable instances.
Instances of HTable passed the same {@link Configuration} instance willshare connections to servers out on the cluster and to the zookeeper ensemble as well as caches of region locations. This is usually a *good* thing and it is recommended to reuse the same configuration object for all your tables. This happens because they will all share the same underlying {@link HConnection} instance. See {@link HConnectionManager} for more onhow this mechanism works.
{@link HConnection} will read most of theconfiguration it needs from the passed {@link Configuration} on initialconstruction. Thereafter, for settings such as hbase.client.pause, hbase.client.retries.number, and hbase.client.rpc.maxattempts updating their values in the passed {@link Configuration} subsequent to {@link HConnection} constructionwill go unnoticed. To run with changed values, make a new {@link HTable} passing a new {@link Configuration} instance that has thenew configuration.
Note that this class implements the {@link Closeable} interface. When aHTable instance is no longer required, it *should* be closed in order to ensure that the underlying resources are promptly released. Please note that the close method can throw java.io.IOException that must be handled. @see HBaseAdmin for create, drop, list, enable and disable of tables. @see HConnection @see HConnectionManager

    public HTable getTable(final byte[] tableName) throws
        IOException {
      String table = new String(tableName);
      Map<String, HTable> tables = threadLocalTables.get();
      if (!tables.containsKey(table)) {
        tables.put(table, new HTable(conf, tableName));
      }
      return tables.get(table);
    }

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    @Override
    public List<TRegionInfo> getTableRegions(ByteBuffer tableName)
    throws IOError {
      try {
        HTable table = getTable(tableName);
        Map<HRegionInfo, ServerName> regionLocations =
            table.getRegionLocations();
        List<TRegionInfo> results = new ArrayList<TRegionInfo>();
        for (Map.Entry<HRegionInfo, ServerName> entry :
            regionLocations.entrySet()) {
          HRegionInfo info = entry.getKey();
          ServerName serverName = entry.getValue();

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                              ByteBuffer row,
                              byte[] family,
                              byte[] qualifier,
                              Map<ByteBuffer, ByteBuffer> attributes) throws IOError {
      try {
        HTable table = getTable(tableName);
        Get get = new Get(getBytes(row));
        addAttributes(get, attributes);
        if (qualifier == null || qualifier.length == 0) {
          get.addFamily(family);
        } else {
          get.addColumn(family, qualifier);
        }
        Result result = table.get(get);
        return ThriftUtilities.cellFromHBase(result.raw());
      } catch (IOException e) {
        LOG.warn(e.getMessage(), e);
        throw new IOError(e.getMessage());
      }

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    public List<TCell> getVer(ByteBuffer tableName, ByteBuffer row,
                              byte[] family,
        byte[] qualifier, int numVersions,
        Map<ByteBuffer, ByteBuffer> attributes) throws IOError {
      try {
        HTable table = getTable(tableName);
        Get get = new Get(getBytes(row));
        addAttributes(get, attributes);
        get.addColumn(family, qualifier);
        get.setMaxVersions(numVersions);
        Result result = table.get(get);
        return ThriftUtilities.cellFromHBase(result.raw());
      } catch (IOException e) {
        LOG.warn(e.getMessage(), e);
        throw new IOError(e.getMessage());
      }

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    protected List<TCell> getVerTs(ByteBuffer tableName,
                                   ByteBuffer row, byte [] family,
        byte [] qualifier, long timestamp, int numVersions,
        Map<ByteBuffer, ByteBuffer> attributes) throws IOError {
      try {
        HTable table = getTable(tableName);
        Get get = new Get(getBytes(row));
        addAttributes(get, attributes);
        get.addColumn(family, qualifier);
        get.setTimeRange(Long.MIN_VALUE, timestamp);
        get.setMaxVersions(numVersions);
        Result result = table.get(get);
        return ThriftUtilities.cellFromHBase(result.raw());
      } catch (IOException e) {
        LOG.warn(e.getMessage(), e);
        throw new IOError(e.getMessage());
      }

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    @Override
    public List<TRowResult> getRowWithColumnsTs(
        ByteBuffer tableName, ByteBuffer row, List<ByteBuffer> columns,
        long timestamp, Map<ByteBuffer, ByteBuffer> attributes) throws IOError {
      try {
        HTable table = getTable(tableName);
        if (columns == null) {
          Get get = new Get(getBytes(row));
          addAttributes(get, attributes);
          get.setTimeRange(Long.MIN_VALUE, timestamp);
          Result result = table.get(get);
          return ThriftUtilities.rowResultFromHBase(result);
        }
        Get get = new Get(getBytes(row));
        addAttributes(get, attributes);
        for(ByteBuffer column : columns) {
          byte [][] famAndQf = KeyValue.parseColumn(getBytes(column));
          if (famAndQf.length == 1) {
              get.addFamily(famAndQf[0]);
          } else {
              get.addColumn(famAndQf[0], famAndQf[1]);
          }
        }
        get.setTimeRange(Long.MIN_VALUE, timestamp);
        Result result = table.get(get);
        return ThriftUtilities.rowResultFromHBase(result);
      } catch (IOException e) {
        LOG.warn(e.getMessage(), e);
        throw new IOError(e.getMessage());
      }

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                                                 List<ByteBuffer> rows,
        List<ByteBuffer> columns, long timestamp,
        Map<ByteBuffer, ByteBuffer> attributes) throws IOError {
      try {
        List<Get> gets = new ArrayList<Get>(rows.size());
        HTable table = getTable(tableName);
        if (metrics != null) {
          metrics.incNumRowKeysInBatchGet(rows.size());
        }
        for (ByteBuffer row : rows) {
          Get get = new Get(getBytes(row));
          addAttributes(get, attributes);
          if (columns != null) {


            for(ByteBuffer column : columns) {
              byte [][] famAndQf = KeyValue.parseColumn(getBytes(column));
              if (famAndQf.length == 1) {
                get.addFamily(famAndQf[0]);
              } else {
                get.addColumn(famAndQf[0], famAndQf[1]);
              }
            }
          }
          get.setTimeRange(Long.MIN_VALUE, timestamp);
          gets.add(get);
        }
        Result[] result = table.get(gets);
        return ThriftUtilities.rowResultFromHBase(result);
      } catch (IOException e) {
        LOG.warn(e.getMessage(), e);
        throw new IOError(e.getMessage());
      }

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    public void deleteAllTs(ByteBuffer tableName,
                            ByteBuffer row,
                            ByteBuffer column,
        long timestamp, Map<ByteBuffer, ByteBuffer> attributes) throws IOError {
      try {
        HTable table = getTable(tableName);
        Delete delete  = new Delete(getBytes(row));
        addAttributes(delete, attributes);
        byte [][] famAndQf = KeyValue.parseColumn(getBytes(column));
        if (famAndQf.length == 1) {
          delete.deleteFamily(famAndQf[0], timestamp);
        } else {
          delete.deleteColumns(famAndQf[0], famAndQf[1], timestamp);
        }
        table.delete(delete);


      } catch (IOException e) {
        LOG.warn(e.getMessage(), e);
        throw new IOError(e.getMessage());
      }

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    @Override
    public void deleteAllRowTs(
        ByteBuffer tableName, ByteBuffer row, long timestamp,
        Map<ByteBuffer, ByteBuffer> attributes) throws IOError {
      try {
        HTable table = getTable(tableName);
        Delete delete  = new Delete(getBytes(row), timestamp, null);
        addAttributes(delete, attributes);
        table.delete(delete);
      } catch (IOException e) {
        LOG.warn(e.getMessage(), e);
        throw new IOError(e.getMessage());
      }
    }

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    @Override
    public void mutateRowTs(ByteBuffer tableName, ByteBuffer row,
        List<Mutation> mutations, long timestamp,
        Map<ByteBuffer, ByteBuffer> attributes)
        throws IOError, IllegalArgument {
      HTable table = null;
      try {
        table = getTable(tableName);
        Put put = new Put(getBytes(row), timestamp, null);
        addAttributes(put, attributes);


        Delete delete = new Delete(getBytes(row));
        addAttributes(delete, attributes);
        if (metrics != null) {
          metrics.incNumRowKeysInBatchMutate(mutations.size());
        }


        // I apologize for all this mess :)
        for (Mutation m : mutations) {
          byte[][] famAndQf = KeyValue.parseColumn(getBytes(m.column));
          if (m.isDelete) {
            if (famAndQf.length == 1) {
              delete.deleteFamily(famAndQf[0], timestamp);
            } else {
              delete.deleteColumns(famAndQf[0], famAndQf[1], timestamp);
            }
            delete.setWriteToWAL(m.writeToWAL);
          } else {
            if(famAndQf.length == 1) {
              put.add(famAndQf[0], HConstants.EMPTY_BYTE_ARRAY,
                  m.value != null ? getBytes(m.value)
                      : HConstants.EMPTY_BYTE_ARRAY);
            } else {
              put.add(famAndQf[0], famAndQf[1],
                  m.value != null ? getBytes(m.value)
                      : HConstants.EMPTY_BYTE_ARRAY);
            }
            put.setWriteToWAL(m.writeToWAL);
          }
        }
        if (!delete.isEmpty())
          table.delete(delete);
        if (!put.isEmpty())
          table.put(put);
      } catch (IOException e) {
        LOG.warn(e.getMessage(), e);
        throw new IOError(e.getMessage());
      } catch (IllegalArgumentException e) {
        LOG.warn(e.getMessage(), e);

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