Shashikant Banerjee created HDFS-13143:
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             Summary: SnapshotDiff - snapshotDiffReport might be inconsistent 
if the snapshotDiff calculation happens between a snapshot and the current tree
                 Key: HDFS-13143
                 URL: https://issues.apache.org/jira/browse/HDFS-13143
             Project: Hadoop HDFS
          Issue Type: Improvement
            Reporter: Shashikant Banerjee
            Assignee: Shashikant Banerjee


HDFS-12594 introduced an iterative approach for computing snapshotDiffs over 
multiple rpc calls. The iterative approach depends upon the startPath (path of 
the directory with respect to the snapshottable root) and the size of the 
createdList (0 in case the startPath refers a file) to exactly determine form 
where in each iteration the calculation has to start.

 

In case of the diff computation between a snapshot and current tree(if any of 
the snapshot names specified in the getSnapshotDiffReport call is null or 
empty), the last SnapshotDiff associated with directory/file might change owing 
to changes in the current tree in between the rpc calls in the absence of a 
global fsn lock. This might result in consistencies in the snapshotDiffReport.

In case the snapshotDiffReport computation needs to be done between the current 
tree and a snapshot, we should fall back to non-iterative approach to compute 
snapshotDiff.



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