[ https://issues.apache.org/jira/browse/HDFS-13102?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16380049#comment-16380049 ]
Shashikant Banerjee commented on HDFS-13102: -------------------------------------------- Thanks [~szetszwo], for the review. patch v8 addresses your review comments. Please have a look. > 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 > Components: snapshots > Reporter: Shashikant Banerjee > Assignee: Shashikant Banerjee > Priority: Major > Attachments: HDFS-13102.001.patch, HDFS-13102.002.patch, > HDFS-13102.003.patch, HDFS-13102.004.patch, HDFS-13102.005.patch, > HDFS-13102.006.patch, HDFS-13102.007.patch, HDFS-13102.008.patch > > > 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. > -- This message was sent by Atlassian JIRA (v7.6.3#76005) --------------------------------------------------------------------- To unsubscribe, e-mail: hdfs-issues-unsubscr...@hadoop.apache.org For additional commands, e-mail: hdfs-issues-h...@hadoop.apache.org