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

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

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

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

org.apache.hadoop.hbase.io.hfile.HFileScanner.seekTo()
SeekTo or just before the passed key. Examine the return code to figure whether we found the key or not. 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 -1, if key < k[0], no position;0, such that k[i] = key and scanner is left in position i; and 1, such that k[i] < key, and scanner is left in position i. Furthermore, there may be a k[i+1], such that k[i] < key < k[i+1] but there may not be a k[i+1], and next() will return false (EOF). @throws IOException

  @Override
  public byte[] getFirstKey() {
    if (!firstKeySeeked) {
      HFileScanner scanner = getScanner(true, true, false);
      try {
        if (scanner.seekTo()) {
          this.firstKey = Bytes.toBytes(scanner.getKey());
        }
        firstKeySeeked = true;
      } catch (IOException e) {
        LOG.warn("Failed seekTo first KV in the file", e);

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    StoreFile refHsf = new StoreFile(this.fs, refPath, conf, cacheConf,
        StoreFile.BloomType.NONE, NoOpDataBlockEncoder.INSTANCE);
    // Now confirm that I can read from the reference and that it only gets
    // keys from top half of the file.
    HFileScanner s = refHsf.createReader().getScanner(false, false);
    for(boolean first = true; (!s.isSeeked() && s.seekTo()) || s.next();) {
      ByteBuffer bb = s.getKey();
      kv = KeyValue.createKeyValueFromKey(bb);
      if (first) {
        assertTrue(Bytes.equals(kv.getRow(), midRow));
        first = false;

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    assertTrue(hsf.isLink());


    // Now confirm that I can read from the link
    int count = 1;
    HFileScanner s = hsf.createReader().getScanner(false, false);
    s.seekTo();
    while (s.next()) {
      count++;
    }
    assertEquals((LAST_CHAR - FIRST_CHAR + 1) * (LAST_CHAR - FIRST_CHAR + 1), count);
  }

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        StoreFile.BloomType.NONE, NoOpDataBlockEncoder.INSTANCE);


    // Now confirm that I can read from the ref to link
    int count = 1;
    HFileScanner s = hsfA.createReader().getScanner(false, false);
    s.seekTo();
    while (s.next()) {
      count++;
    }
    assertTrue(count > 0); // read some rows here

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    StoreFile hsfB = new StoreFile(this.fs, pathB,  conf, cacheConf,
        StoreFile.BloomType.NONE, NoOpDataBlockEncoder.INSTANCE);


    // Now confirm that I can read from the ref to link
    HFileScanner sB = hsfB.createReader().getScanner(false, false);
    sB.seekTo();
    while (sB.next()) {
      count++;
    }


    // read the rest of the rows

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      // Test bottom half first.
      // Now test reading from the top.
      boolean first = true;
      ByteBuffer key = null;
      HFileScanner topScanner = top.getScanner(false, false);
      while ((!topScanner.isSeeked() && topScanner.seekTo()) ||
          (topScanner.isSeeked() && topScanner.next())) {
        key = topScanner.getKey();


        if (topScanner.getReader().getComparator().compare(key.array(),
          key.arrayOffset(), key.limit(), midkey, 0, midkey.length) < 0) {

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      }
      LOG.info("Last in top: " + Bytes.toString(Bytes.toBytes(key)));


      first = true;
      HFileScanner bottomScanner = bottom.getScanner(false, false);
      while ((!bottomScanner.isSeeked() && bottomScanner.seekTo()) ||
          bottomScanner.next()) {
        previous = bottomScanner.getKey();
        key = bottomScanner.getKey();
        if (first) {
          first = false;

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      bottom = new StoreFile(this.fs, bottomPath, conf, cacheConf,
          StoreFile.BloomType.NONE,
          NoOpDataBlockEncoder.INSTANCE).createReader();
      bottomScanner = bottom.getScanner(false, false);
      int count = 0;
      while ((!bottomScanner.isSeeked() && bottomScanner.seekTo()) ||
          bottomScanner.next()) {
        count++;
      }
      // When badkey is < than the bottom, should return no values.
      assertTrue(count == 0);

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      bottom = new StoreFile(this.fs, bottomPath, conf, cacheConf,
          StoreFile.BloomType.NONE,
          NoOpDataBlockEncoder.INSTANCE).createReader();
      first = true;
      bottomScanner = bottom.getScanner(false, false);
      while ((!bottomScanner.isSeeked() && bottomScanner.seekTo()) ||
          bottomScanner.next()) {
        key = bottomScanner.getKey();
        if (first) {
          first = false;
          keyKV = KeyValue.createKeyValueFromKey(key);

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    try {
      HFile.Reader hfr = HFile.createReader(fs, path, cacheConfig, conf);
      HFileScanner scanner = hfr.getScanner(
          conf.getBoolean(HFILE_SCANNER_CACHE_BLOCKS, false),
          conf.getBoolean(HFILE_SCANNER_PREAD, false));
      scanner.seekTo();
      return new HFileIterator(scanner);
    } catch (IOException e) {
      throw new RuntimeException(e);
    }
  }

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