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From "Shashikant Banerjee (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-13227) Add a method to calculate cumulative diff over multiple snapshots in DirectoryDiffList
Date Mon, 05 Mar 2018 11:59:00 GMT
Shashikant Banerjee created HDFS-13227:
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             Summary: Add a method to  calculate cumulative diff over multiple snapshots in
DirectoryDiffList
                 Key: HDFS-13227
                 URL: https://issues.apache.org/jira/browse/HDFS-13227
             Project: Hadoop HDFS
          Issue Type: Improvement
          Components: snapshots
            Reporter: Shashikant Banerjee
            Assignee: Shashikant Banerjee


This Jira proposes to add an API in DirectoryWithSnapshotFeature#f DirectoryDiffList which
will return minimal list of diffs needed to combine to get the cumulative diff between two
given snapshots. The same method will be made use while constructing the childrenList for
a directory. DirectoryWithSnapshotFeature#getChildrenList     and DirectoryWithSnapshotFeature#computeDiffBetweenSnapshots
will make use of the same method to get the cumulative diff. When snapshotSkipList, with minimal
set of diffs to combine in order to get the cumulative diff, the overall computation will
be faster.



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