Examples of org.apache.hadoop.hbase.io.hfile.HFileScanner.seekBefore()

Package org.apache.hadoop.hbase.io.hfile

Class org.apache.hadoop.hbase.io.hfile.HFileScanner

Examples of org.apache.hadoop.hbase.io.hfile.HFileScanner.seekBefore()

org.apache.hadoop.hbase.io.hfile.HFileScanner.seekBefore()
Consider the key stream of all the keys in the file, k[0] .. k[n], where there are n keys in the file. @param key Key to find @return false if key <= k[0] or true with scanner in position 'i' suchthat: k[i] < key. Furthermore: there may be a k[i+1], such that k[i] < key <= k[i+1] but there may also NOT be a k[i+1], and next() will return false (EOF). @throws IOException

            throws IOException {
      final HalfStoreFileReader halfreader = new HalfStoreFileReader(fs, p,
              cacheConfig, bottom, DataBlockEncoding.NONE);
      halfreader.loadFileInfo();
      final HFileScanner scanner = halfreader.getScanner(false, false);
      scanner.seekBefore(seekBefore.getKey());
      return scanner.getKeyValue();
  }


  private KeyValue getLastOnCol(KeyValue curr) {
    return KeyValue.createLastOnRow(

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      return super.getLastKey();
    }
    // Get a scanner that caches the block and that uses pread.
    HFileScanner scanner = getScanner(true, true);
    try {
      if (scanner.seekBefore(this.splitkey)) {
        return Bytes.toBytes(scanner.getKey());
      }
    } catch (IOException e) {
      LOG.warn("Failed seekBefore " + Bytes.toString(this.splitkey), e);
    }

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    if (!seekToScanner(scanner, firstOnRow, firstKV)) return;
    // If we found candidate on firstOnRow, just return. THIS WILL NEVER HAPPEN!
    // Unlikely that there'll be an instance of actual first row in table.
    if (walkForwardInSingleRow(scanner, firstOnRow, state)) return;
    // If here, need to start backing up.
    while (scanner.seekBefore(firstOnRow.getBuffer(), firstOnRow.getKeyOffset(),
       firstOnRow.getKeyLength())) {
      KeyValue kv = scanner.getKeyValue();
      if (!state.isTargetTable(kv)) break;
      if (!state.isBetterCandidate(kv)) break;
      // Make new first on row.

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    if (!seekToScanner(scanner, firstOnRow, firstKV)) return;
    // If we found candidate on firstOnRow, just return. THIS WILL NEVER HAPPEN!
    // Unlikely that there'll be an instance of actual first row in table.
    if (walkForwardInSingleRow(scanner, firstOnRow, state)) return;
    // If here, need to start backing up.
    while (scanner.seekBefore(firstOnRow.getBuffer(), firstOnRow.getKeyOffset(),
       firstOnRow.getKeyLength())) {
      KeyValue kv = scanner.getKeyValue();
      if (!state.isTargetTable(kv)) break;
      if (!state.isBetterCandidate(kv)) break;
      // Make new first on row.

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    if (!seekToScanner(scanner, firstOnRow, firstKV)) return false;
    // If we found candidate on firstOnRow, just return. THIS WILL NEVER HAPPEN!
    // Unlikely that there'll be an instance of actual first row in table.
    if (walkForwardInSingleRow(scanner, firstOnRow, state)) return true;
    // If here, need to start backing up.
    while (scanner.seekBefore(firstOnRow.getBuffer(), firstOnRow.getKeyOffset(),
       firstOnRow.getKeyLength())) {
      Cell kv = scanner.getKeyValue();
      if (!state.isTargetTable(kv)) break;
      if (!state.isBetterCandidate(kv)) break;
      // Make new first on row.

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      return super.getLastKey();
    }
    // Get a scanner that caches the block and that uses pread.
    HFileScanner scanner = getScanner(true, true);
    try {
      if (scanner.seekBefore(this.splitkey)) {
        return Bytes.toBytes(scanner.getKey());
      }
    } catch (IOException e) {
      LOG.warn("Failed seekBefore " + Bytes.toStringBinary(this.splitkey), e);
    }

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    if (!seekToScanner(scanner, firstOnRow, firstKV)) return;
    // If we found candidate on firstOnRow, just return. THIS WILL NEVER HAPPEN!
    // Unlikely that there'll be an instance of actual first row in table.
    if (walkForwardInSingleRow(scanner, firstOnRow, state)) return;
    // If here, need to start backing up.
    while (scanner.seekBefore(firstOnRow.getBuffer(), firstOnRow.getKeyOffset(),
       firstOnRow.getKeyLength())) {
      KeyValue kv = scanner.getKeyValue();
      if (!state.isTargetTable(kv)) break;
      if (!state.isBetterCandidate(kv)) break;
      // Make new first on row.

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    if (!seekToScanner(scanner, firstOnRow, firstKV)) return;
    // If we found candidate on firstOnRow, just return. THIS WILL NEVER HAPPEN!
    // Unlikely that there'll be an instance of actual first row in table.
    if (walkForwardInSingleRow(scanner, firstOnRow, state)) return;
    // If here, need to start backing up.
    while (scanner.seekBefore(firstOnRow.getBuffer(), firstOnRow.getKeyOffset(),
       firstOnRow.getKeyLength())) {
      KeyValue kv = scanner.getKeyValue();
      if (!state.isTargetTable(kv)) break;
      if (!state.isBetterCandidate(kv)) break;
      // Make new first on row.

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    if (!seekToScanner(scanner, firstOnRow, firstKV)) return;
    // If we found candidate on firstOnRow, just return. THIS WILL NEVER HAPPEN!
    // Unlikely that there'll be an instance of actual first row in table.
    if (walkForwardInSingleRow(scanner, firstOnRow, state)) return;
    // If here, need to start backing up.
    while (scanner.seekBefore(firstOnRow.getBuffer(), firstOnRow.getKeyOffset(),
       firstOnRow.getKeyLength())) {
      KeyValue kv = scanner.getKeyValue();
      if (!state.isTargetTable(kv)) break;
      if (!state.isBetterCandidate(kv)) break;
      // Make new first on row.

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    if (!seekToScanner(scanner, firstOnRow, firstKV)) return;
    // If we found candidate on firstOnRow, just return. THIS WILL NEVER HAPPEN!
    // Unlikely that there'll be an instance of actual first row in table.
    if (walkForwardInSingleRow(scanner, firstOnRow, state)) return;
    // If here, need to start backing up.
    while (scanner.seekBefore(firstOnRow.getBuffer(), firstOnRow.getKeyOffset(),
       firstOnRow.getKeyLength())) {
      KeyValue kv = scanner.getKeyValue();
      if (!state.isTargetTable(kv)) break;
      if (!state.isBetterCandidate(kv)) break;
      // Make new first on row.

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