Yiqun Lin created HDFS-13928:
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             Summary: Add the corner case testings for log roll
                 Key: HDFS-13928
                 URL: https://issues.apache.org/jira/browse/HDFS-13928
             Project: Hadoop HDFS
          Issue Type: Improvement
    Affects Versions: 3.1.1
            Reporter: Yiqun Lin


We find some corner cases for log roll when doing jounalnode migration in our 
cluster. We use a online way for the migration. And there will cause some 
corner cases:
 * Multiple in-progress  edits_inprogress* files exists in edits dir, if log 
roll is updated correctly. In this case, we can divide this into two cases:
 1.With redundant in-progress file with higher txid than current in-progress 
file
 2.With redundant in-progress file with lower txid than current in-progress file

 * In a HA mode, SBN is down, what's the behavior of log roll will become?

We can complete the log roll UTs for above cases.




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