Java Code Examples for org.apache.hadoop.hdfs.DistributedFileSystem#getFileBlockLocations()

The following examples show how to use org.apache.hadoop.hdfs.DistributedFileSystem#getFileBlockLocations() . 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: TestCacheDirectives.java    From hadoop with Apache License 2.0 5 votes vote down vote up 
private static void checkNumCachedReplicas(final DistributedFileSystem dfs,
    final List<Path> paths, final int expectedBlocks,
    final int expectedReplicas)
    throws Exception {
  int numCachedBlocks = 0;
  int numCachedReplicas = 0;
  for (Path p: paths) {
    final FileStatus f = dfs.getFileStatus(p);
    final long len = f.getLen();
    final long blockSize = f.getBlockSize();
    // round it up to full blocks
    final long numBlocks = (len + blockSize - 1) / blockSize;
    BlockLocation[] locs = dfs.getFileBlockLocations(p, 0, len);
    assertEquals("Unexpected number of block locations for path " + p,
        numBlocks, locs.length);
    for (BlockLocation l: locs) {
      if (l.getCachedHosts().length > 0) {
        numCachedBlocks++;
      }
      numCachedReplicas += l.getCachedHosts().length;
    }
  }
  LOG.info("Found " + numCachedBlocks + " of " + expectedBlocks + " blocks");
  LOG.info("Found " + numCachedReplicas + " of " + expectedReplicas
      + " replicas");
  assertEquals("Unexpected number of cached blocks", expectedBlocks,
      numCachedBlocks);
  assertEquals("Unexpected number of cached replicas", expectedReplicas,
      numCachedReplicas);
}
Example 2
Source File: TestCacheDirectives.java    From big-c with Apache License 2.0 5 votes vote down vote up 
private static void checkNumCachedReplicas(final DistributedFileSystem dfs,
    final List<Path> paths, final int expectedBlocks,
    final int expectedReplicas)
    throws Exception {
  int numCachedBlocks = 0;
  int numCachedReplicas = 0;
  for (Path p: paths) {
    final FileStatus f = dfs.getFileStatus(p);
    final long len = f.getLen();
    final long blockSize = f.getBlockSize();
    // round it up to full blocks
    final long numBlocks = (len + blockSize - 1) / blockSize;
    BlockLocation[] locs = dfs.getFileBlockLocations(p, 0, len);
    assertEquals("Unexpected number of block locations for path " + p,
        numBlocks, locs.length);
    for (BlockLocation l: locs) {
      if (l.getCachedHosts().length > 0) {
        numCachedBlocks++;
      }
      numCachedReplicas += l.getCachedHosts().length;
    }
  }
  LOG.info("Found " + numCachedBlocks + " of " + expectedBlocks + " blocks");
  LOG.info("Found " + numCachedReplicas + " of " + expectedReplicas
      + " replicas");
  assertEquals("Unexpected number of cached blocks", expectedBlocks,
      numCachedBlocks);
  assertEquals("Unexpected number of cached replicas", expectedReplicas,
      numCachedReplicas);
}
Example 3
Source File: RaidShell.java    From RDFS with Apache License 2.0 5 votes vote down vote up 
void collectFileCorruptBlocksInStripe(final DistributedFileSystem dfs, 
    final RaidInfo raidInfo, final Path filePath, 
    final HashMap<Integer, Integer> corruptBlocksPerStripe)
        throws IOException {
  // read conf
  final int stripeBlocks = raidInfo.codec.stripeLength;

  // figure out which blocks are missing/corrupted
  final FileStatus fileStatus = dfs.getFileStatus(filePath);
  final long blockSize = fileStatus.getBlockSize();
  final long fileLength = fileStatus.getLen();
  final long fileLengthInBlocks = RaidNode.numBlocks(fileStatus); 
  final long fileStripes = RaidNode.numStripes(fileLengthInBlocks,
      stripeBlocks);
  final BlockLocation[] fileBlocks = 
    dfs.getFileBlockLocations(fileStatus, 0, fileLength);
  
  // figure out which stripes these corrupted blocks belong to
  for (BlockLocation fileBlock: fileBlocks) {
    int blockNo = (int) (fileBlock.getOffset() / blockSize);
    final int stripe = blockNo / stripeBlocks;
    if (this.isBlockCorrupt(fileBlock)) {
      this.incCorruptBlocksPerStripe(corruptBlocksPerStripe, stripe);
      if (LOG.isDebugEnabled()) {
        LOG.debug("file " + filePath.toString() + " corrupt in block " + 
                 blockNo + "/" + fileLengthInBlocks + ", stripe " + stripe +
                 "/" + fileStripes);
      }
    } else {
      if (LOG.isDebugEnabled()) {
        LOG.debug("file " + filePath.toString() + " OK in block " + blockNo +
                 "/" + fileLengthInBlocks + ", stripe " + stripe + "/" +
                 fileStripes);
      }
    }
  }
  checkParityBlocks(filePath, corruptBlocksPerStripe, blockSize, 0, fileStripes,
                    fileStripes, raidInfo);
}