Examples of org.apache.hadoop.hbase.HTableDescriptor

org.apache.hadoop.hbase.HTableDescriptor
HTableDescriptor contains the details about an HBase table such as the descriptors of all the column families, is the table a catalog table, -ROOT- or .META. , is the table is read only, the maximum size of the memstore, when the region split should occur, coprocessors associated with it etc...

      public void handleRegionStartKeyNotEmpty(HbckInfo next) throws IOException {
        errors.reportError(ERROR_CODE.FIRST_REGION_STARTKEY_NOT_EMPTY,
            "First region should start with an empty key.  Creating a new " +
            "region and regioninfo in HDFS to plug the hole.",
            getTableInfo(), next);
        HTableDescriptor htd = getTableInfo().getHTD();
        // from special EMPTY_START_ROW to next region's startKey
        HRegionInfo newRegion = new HRegionInfo(htd.getName(),
            HConstants.EMPTY_START_ROW, next.getStartKey());


        // TODO test
        HRegion region = HBaseFsckRepair.createHDFSRegionDir(conf, newRegion, htd);
        LOG.info("Table region start key was not empty.  Created new empty region: "

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      public void handleRegionEndKeyNotEmpty(byte[] curEndKey) throws IOException {
        errors.reportError(ERROR_CODE.LAST_REGION_ENDKEY_NOT_EMPTY,
            "Last region should end with an empty key. Creating a new "
                + "region and regioninfo in HDFS to plug the hole.", getTableInfo());
        HTableDescriptor htd = getTableInfo().getHTD();
        // from curEndKey to EMPTY_START_ROW
        HRegionInfo newRegion = new HRegionInfo(htd.getName(), curEndKey,
            HConstants.EMPTY_START_ROW);


        HRegion region = HBaseFsckRepair.createHDFSRegionDir(conf, newRegion, htd);
        LOG.info("Table region end key was not empty. Created new empty region: " + newRegion
            + " " + region);

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            "There is a hole in the region chain between "
                + Bytes.toStringBinary(holeStartKey) + " and "
                + Bytes.toStringBinary(holeStopKey)
                + ".  Creating a new regioninfo and region "
                + "dir in hdfs to plug the hole.");
        HTableDescriptor htd = getTableInfo().getHTD();
        HRegionInfo newRegion = new HRegionInfo(htd.getName(), holeStartKey, holeStopKey);
        HRegion region = HBaseFsckRepair.createHDFSRegionDir(conf, newRegion, htd);
        LOG.info("Plugged hold by creating new empty region: "+ newRegion + " " +region);
        fixes++;
      }

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              + ".  Just continuing... ", ioe);
          }
        }


        // create new empty container region.
        HTableDescriptor htd = getTableInfo().getHTD();
        // from start key to end Key
        HRegionInfo newRegion = new HRegionInfo(htd.getName(), range.getFirst(),
            range.getSecond());
        HRegion region = HBaseFsckRepair.createHDFSRegionDir(conf, newRegion, htd);
        LOG.info("Created new empty container region: " +
            newRegion + " to contain regions: " + Joiner.on(",").join(overlap));
        debugLsr(region.getRegionDir());

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   */
  public HTableDescriptor[] getHTableDescriptors(List<String> tableNames) {
    List<HTableDescriptor> list =
      new ArrayList<HTableDescriptor>(tableNames.size());
    for (String s: tableNames) {
      HTableDescriptor htd = null;
      try {
        htd = this.tableDescriptors.get(s);
      } catch (IOException e) {
        LOG.warn("Failed getting descriptor for " + s, e);
      }

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  public Map<String, HTableDescriptor> getAll()
  throws IOException {
    Map<String, HTableDescriptor> htds = new TreeMap<String, HTableDescriptor>();
    List<Path> tableDirs = FSUtils.getTableDirs(fs, rootdir);
    for (Path d: tableDirs) {
      HTableDescriptor htd = null;
      try {


        htd = get(d.getName());
      } catch (FileNotFoundException fnfe) {
        // inability of retrieving one HTD shouldn't stop getting the remaining

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   * @throws IOException
   */
  public static HTableDescriptor getTableDescriptor(FileSystem fs,
      Path hbaseRootDir, byte[] tableName)
  throws IOException {
     HTableDescriptor htd = null;
     try {
       TableDescriptorModtime tdmt =
         getTableDescriptorModtime(fs, hbaseRootDir, Bytes.toString(tableName));
       htd = tdmt == null ? null : tdmt.getTableDescriptor();
     } catch (NullPointerException e) {

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    if (status == null) {
      throw new TableInfoMissingException("No .tableinfo file under "
          + tableDir.toUri());
    }
    FSDataInputStream fsDataInputStream = fs.open(status.getPath());
    HTableDescriptor hTableDescriptor = null;
    try {
      hTableDescriptor = new HTableDescriptor();
      hTableDescriptor.readFields(fsDataInputStream);
    } finally {
      fsDataInputStream.close();
    }
    return new TableDescriptorModtime(status.getModificationTime(), hTableDescriptor);
  }

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  }


  private HTableDescriptor loadTableDescriptor()
      throws FileNotFoundException, IOException {
    final String name = snapshot.getTable();
    HTableDescriptor htd =
      this.master.getTableDescriptors().get(name);
    if (htd == null) {
      throw new IOException("HTableDescriptor missing for " + name);
    }
    return htd;

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   * @return cloned table descriptor
   * @throws IOException
   */
  public static HTableDescriptor cloneTableSchema(final HTableDescriptor snapshotTableDescriptor,
      final byte[] tableName) throws IOException {
    HTableDescriptor htd = new HTableDescriptor(tableName);
    for (HColumnDescriptor hcd: snapshotTableDescriptor.getColumnFamilies()) {
      htd.addFamily(hcd);
    }
    return htd;
  }

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