Li Junjun created HDFS-4424:
-------------------------------

             Summary: fsdataset  Mkdirs failed  cause  nullpointexception and 
other bad  consequence 
                 Key: HDFS-4424
                 URL: https://issues.apache.org/jira/browse/HDFS-4424
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: datanode
    Affects Versions: 1.0.1
            Reporter: Li Junjun


from line 205:

      if (children == null || children.length == 0) {
        children = new FSDir[maxBlocksPerDir];
        for (int idx = 0; idx < maxBlocksPerDir; idx++) {
          children[idx] = new FSDir(new File(dir, 
DataStorage.BLOCK_SUBDIR_PREFIX+idx));
        }
      }
in FSDir constructer method if faild  the children still exists







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