[jira] [Created] (HDFS-11476) Fix NPE in FsDatasetImpl#checkAndUpdate

["Xiaobing Zhou (JIRA)" <ji...@apache.org>]

Xiaobing Zhou created HDFS-11476:
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             Summary: Fix NPE in FsDatasetImpl#checkAndUpdate
                 Key: HDFS-11476
                 URL: https://issues.apache.org/jira/browse/HDFS-11476
             Project: Hadoop HDFS
          Issue Type: Bug
            Reporter: Xiaobing Zhou
            Assignee: Xiaobing Zhou


diskMetaFile can be null and passed to compareTo which dereferences it, causing NPE
{code}
// Compare generation stamp
      if (memBlockInfo.getGenerationStamp() != diskGS) {
        File memMetaFile = FsDatasetUtil.getMetaFile(diskFile, 
            memBlockInfo.getGenerationStamp());
        if (memMetaFile.exists()) {
          if (memMetaFile.compareTo(diskMetaFile) != 0) {
            LOG.warn("Metadata file in memory "
                + memMetaFile.getAbsolutePath()
                + " does not match file found by scan "
                + (diskMetaFile == null? null: diskMetaFile.getAbsolutePath()));
          }
        } else {
{code}



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