Shashikant Banerjee created HDFS-13102:
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Summary: Implement SnapshotSkipList class to store Multi level
DirectoryDiffs
Key: HDFS-13102
URL: https://issues.apache.org/jira/browse/HDFS-13102
Project: Hadoop HDFS
Issue Type: Improvement
Reporter: Shashikant Banerjee
Assignee: Shashikant Banerjee
HDFS-11225 explains an issue where deletion of older snapshots can take a very
long time in case the no of snapshot diffs is quite large for directories. For
any directory under a snapshot, to construct the children list , it needs to
combine all the diffs from that particular snapshot to the last snapshotDiff
record and reverseApply to the current children list of the directory on live
fs. This can take a significant time if the no of snapshot diffs are quite
large and changes per diff is significant.
This Jira proposes to store the Directory diffs in a SnapshotSkip list, where
we store multi level DirectoryDiffs. At each level, the Directory Diff will be
cumulative diff of k snapshot diffs,
where k is the level of a node in the list.
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