[jira] [Created] (HDFS-7764) DirectoryScanner should cancel the future tasks when #compileReport throws exception

["Rakesh R (JIRA)" <ji...@apache.org>]

Rakesh R created HDFS-7764:
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             Summary: DirectoryScanner should cancel the future tasks when #compileReport throws exception
                 Key: HDFS-7764
                 URL: https://issues.apache.org/jira/browse/HDFS-7764
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: datanode
    Affects Versions: 2.7.0
            Reporter: Rakesh R
            Assignee: Rakesh R


If there is an exception while preparing the ScanInfo for the blocks in the directory, DirectoryScanner is immediately throwing exception and coming out of the current scan cycle. It would be good if he can signal #cancel() to the other pending tasks .

DirectoryScanner.java
{code}
    for (Entry<Integer, Future<ScanInfoPerBlockPool>> report :
        compilersInProgress.entrySet()) {
      try {
        dirReports[report.getKey()] = report.getValue().get();
      } catch (Exception ex) {
        LOG.error("Error compiling report", ex);
        // Propagate ex to DataBlockScanner to deal with
        throw new RuntimeException(ex);
      }
{code}



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