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

org.apache.hadoop.hbase.client.Table
Used to communicate with a single HBase table. Obtain an instance from an {@link HConnection}. @since 0.99.0

    }
  }


  @Override
  public TResult append(ByteBuffer table, TAppend append) throws TIOError, TException {
    Table htable = getTable(table);
    try {
      return resultFromHBase(htable.append(appendFromThrift(append)));
    } catch (IOException e) {
      throw getTIOError(e);
    } finally {
      closeTable(htable);
    }

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    }
  }


  @Override
  public int openScanner(ByteBuffer table, TScan scan) throws TIOError, TException {
    Table htable = getTable(table);
    ResultScanner resultScanner = null;
    try {
      resultScanner = htable.getScanner(scanFromThrift(scan));
    } catch (IOException e) {
      throw getTIOError(e);
    } finally {
      closeTable(htable);
    }

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  }


  @Override
  public List<TResult> getScannerResults(ByteBuffer table, TScan scan, int numRows)
      throws TIOError, TException {
    Table htable = getTable(table);
    List<TResult> results = null;
    ResultScanner scanner = null;
    try {
      scanner = htable.getScanner(scanFromThrift(scan));
      results = resultsFromHBase(scanner.next(numRows));
    } catch (IOException e) {
      throw getTIOError(e);
    } finally {
      if (scanner != null) {

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    removeScanner(scannerId);
  }


  @Override
  public void mutateRow(ByteBuffer table, TRowMutations rowMutations) throws TIOError, TException {
    Table htable = getTable(table);
    try {
      htable.mutateRow(rowMutationsFromThrift(rowMutations));
    } catch (IOException e) {
      throw getTIOError(e);
    } finally {
      closeTable(htable);
    }

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      int caching = hConnection.getConfiguration()
          .getInt(HConstants.HBASE_META_SCANNER_CACHING, 100);
      scan.setCaching(caching);
    }
    scan.addFamily(HConstants.CATALOG_FAMILY);
    Table metaTable = getMetaHTable(hConnection);
    ResultScanner scanner = null;
    try {
      scanner = metaTable.getScanner(scan);
      Result data;
      while((data = scanner.next()) != null) {
        if (data.isEmpty()) continue;
        // Break if visit returns false.
        if (!visitor.visit(data)) break;
      }
    } finally {
      if (scanner != null) scanner.close();
      metaTable.close();
    }
  }

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   * @param ps Put to add to hbase:meta
   * @throws IOException
   */
  public static void putsToMetaTable(final HConnection hConnection, final List<Put> ps)
    throws IOException {
    Table t = getMetaHTable(hConnection);
    try {
      t.put(ps);
    } finally {
      t.close();
    }
  }

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   * @param deletes Deletes to add to hbase:meta  This list should support #remove.
   * @throws IOException
   */
  public static void deleteFromMetaTable(final HConnection hConnection, final List<Delete> deletes)
    throws IOException {
    Table t = getMetaHTable(hConnection);
    try {
      t.delete(deletes);
    } finally {
      t.close();
    }
  }

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   * @throws IOException
   */
  public static void mutateMetaTable(final HConnection hConnection,
                                     final List<Mutation> mutations)
    throws IOException {
    Table t = getMetaHTable(hConnection);
    try {
      t.batch(mutations);
    } catch (InterruptedException e) {
      InterruptedIOException ie = new InterruptedIOException(e.getMessage());
      ie.initCause(e);
      throw ie;
    } finally {
      t.close();
    }
  }

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   * @param splitB second split daughter of the parent regionInfo
   * @throws IOException if problem connecting or updating meta
   */
  public static void addRegionToMeta(HConnection hConnection, HRegionInfo regionInfo,
                                     HRegionInfo splitA, HRegionInfo splitB) throws IOException {
    Table meta = getMetaHTable(hConnection);
    try {
      addRegionToMeta(meta, regionInfo, splitA, splitB);
    } finally {
      meta.close();
    }
  }

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   * @param sn the location of the region
   * @throws IOException
   */
  public static void mergeRegions(final HConnection hConnection, HRegionInfo mergedRegion,
      HRegionInfo regionA, HRegionInfo regionB, ServerName sn) throws IOException {
    Table meta = getMetaHTable(hConnection);
    try {
      HRegionInfo copyOfMerged = new HRegionInfo(mergedRegion);


      // Put for parent
      Put putOfMerged = makePutFromRegionInfo(copyOfMerged);
      putOfMerged.addImmutable(HConstants.CATALOG_FAMILY, HConstants.MERGEA_QUALIFIER,
        regionA.toByteArray());
      putOfMerged.addImmutable(HConstants.CATALOG_FAMILY, HConstants.MERGEB_QUALIFIER,
        regionB.toByteArray());


      // Deletes for merging regions
      Delete deleteA = makeDeleteFromRegionInfo(regionA);
      Delete deleteB = makeDeleteFromRegionInfo(regionB);


      // The merged is a new region, openSeqNum = 1 is fine.
      addLocation(putOfMerged, sn, 1, mergedRegion.getReplicaId());


      byte[] tableRow = Bytes.toBytes(mergedRegion.getRegionNameAsString()
        + HConstants.DELIMITER);
      multiMutate(meta, tableRow, putOfMerged, deleteA, deleteB);
    } finally {
      meta.close();
    }
  }

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