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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