Tsz Wo Nicholas Sze created HDFS-13223:

             Summary: Reduce DiffListBySkipList memory usage
                 Key: HDFS-13223
                 URL: https://issues.apache.org/jira/browse/HDFS-13223
             Project: Hadoop HDFS
          Issue Type: Improvement
          Components: snapshots
            Reporter: Tsz Wo Nicholas Sze
            Assignee: Shashikant Banerjee

There are several ways to reduce memory footprint of DiffListBySkipList.
- Move maxSkipLevels and skipInterval to DirectoryDiffListFactory.
- Use an array for skipDiffList instead of List.
- Do not store the level 0 element in skipDiffList.
- Do not create new ChildrenDiff for the same value.

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