Java Code Examples for org.apache.hadoop.mapred.Merger.Segment#close()

The following examples show how to use org.apache.hadoop.mapred.Merger.Segment#close() . You can vote up the ones you like or vote down the ones you don't like, and go to the original project or source file by following the links above each example. You may check out the related API usage on the sidebar.
Example 1
Source File: BackupStore.java    From hadoop with Apache License 2.0 5 votes vote down vote up 
public void mark() throws IOException {

    // We read one KV pair in advance in hasNext. 
    // If hasNext has read the next KV pair from a new segment, but the
    // user has not called next() for that KV, then reset the readSegmentIndex
    // to the previous segment

    if (nextKVOffset == 0) {
      assert (readSegmentIndex != 0);
      assert (currentKVOffset != 0);
      readSegmentIndex --;
    }

    // just drop segments before the current active segment

    int i = 0;
    Iterator<Segment<K,V>> itr = segmentList.iterator();
    while (itr.hasNext()) {
      Segment<K,V> s = itr.next();
      if (i == readSegmentIndex) {
        break;
      }
      s.close();
      itr.remove();
      i++;
      LOG.debug("Dropping a segment");
    }

    // FirstSegmentOffset is the offset in the current segment from where we
    // need to start reading on the next reset

    firstSegmentOffset = currentKVOffset;
    readSegmentIndex = 0;

    LOG.debug("Setting the FirsSegmentOffset to " + currentKVOffset);
  }
Example 2
Source File: BackupStore.java    From hadoop with Apache License 2.0 5 votes vote down vote up 
private void clearSegmentList() throws IOException {
  for (Segment<K,V> segment: segmentList) {
    long len = segment.getLength();
    segment.close();
    if (segment.inMemory()) {
     memCache.unreserve(len);
    }
  }
  segmentList.clear();
}
Example 3
Source File: BackupStore.java    From big-c with Apache License 2.0 5 votes vote down vote up 
public void mark() throws IOException {

    // We read one KV pair in advance in hasNext. 
    // If hasNext has read the next KV pair from a new segment, but the
    // user has not called next() for that KV, then reset the readSegmentIndex
    // to the previous segment

    if (nextKVOffset == 0) {
      assert (readSegmentIndex != 0);
      assert (currentKVOffset != 0);
      readSegmentIndex --;
    }

    // just drop segments before the current active segment

    int i = 0;
    Iterator<Segment<K,V>> itr = segmentList.iterator();
    while (itr.hasNext()) {
      Segment<K,V> s = itr.next();
      if (i == readSegmentIndex) {
        break;
      }
      s.close();
      itr.remove();
      i++;
      LOG.debug("Dropping a segment");
    }

    // FirstSegmentOffset is the offset in the current segment from where we
    // need to start reading on the next reset

    firstSegmentOffset = currentKVOffset;
    readSegmentIndex = 0;

    LOG.debug("Setting the FirsSegmentOffset to " + currentKVOffset);
  }
Example 4
Source File: BackupStore.java    From big-c with Apache License 2.0 5 votes vote down vote up 
private void clearSegmentList() throws IOException {
  for (Segment<K,V> segment: segmentList) {
    long len = segment.getLength();
    segment.close();
    if (segment.inMemory()) {
     memCache.unreserve(len);
    }
  }
  segmentList.clear();
}