[jira] [Created] (HDFS-11709) StandbyCheckpointer should handle an non-existing legacyOivImageDir gracefully

["Zhe Zhang (JIRA)" <ji...@apache.org>]

Zhe Zhang created HDFS-11709:
--------------------------------

             Summary: StandbyCheckpointer should handle an non-existing legacyOivImageDir gracefully
                 Key: HDFS-11709
                 URL: https://issues.apache.org/jira/browse/HDFS-11709
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: ha, namenode
    Affects Versions: 2.6.1
            Reporter: Zhe Zhang
            Assignee: Erik Krogen
            Priority: Critical


In {{StandbyCheckpointer}}, if the legacy OIV directory is not properly created, or was deleted for some reason (e.g. mis-operation), all checkpoint ops will fall. Not only the ANN won't receive new fsimages, the JNs will get full with edit log files, and cause NN to crash.
{code}
      // Save the legacy OIV image, if the output dir is defined.
      String outputDir = checkpointConf.getLegacyOivImageDir();
      if (outputDir != null && !outputDir.isEmpty()) {
        img.saveLegacyOIVImage(namesystem, outputDir, canceler);
      }
{code}

It doesn't make sense to let such an unimportant part (saving OIV) abort all checkpoints and cause NN crash (and possibly lose data).



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