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https://issues.apache.org/jira/browse/HDFS-4131?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14641078#comment-14641078
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Yongjun Zhang commented on HDFS-4131:
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Hi [~jingzhao],
Thanks for your earlier work on this. I have a question. It's said that we
won't guarantee the order of the entries in the diff report at the end of the
document page:
http://hadoop.apache.org/docs/current/hadoop-project-dist/hadoop-hdfs/HdfsSnapshots.html
May I know if it's possible to keep the order? Or it's not possible with
current data structure/algorithm?
Thanks a lot.
> Add capability to namenode to get snapshot diff
> -----------------------------------------------
>
> Key: HDFS-4131
> URL: https://issues.apache.org/jira/browse/HDFS-4131
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: datanode, namenode
> Affects Versions: Snapshot (HDFS-2802)
> Reporter: Suresh Srinivas
> Assignee: Jing Zhao
> Fix For: Snapshot (HDFS-2802)
>
> Attachments: HDFS-4131.001.patch, HDFS-4131.002.patch,
> HDFS-4131.003.patch, HDFS-4131.004.patch, HDFS-4131.005.patch,
> HDFS-4131.006.patch
>
>
> This jira provides internal data structures and computation processes for
> calculating and representing the diff between two snapshots, or the diff
> between a snapshot and the current tree.
> Specifically, a new method getSnapshotDiffReport(Path, String, String) is
> added to FSNamesystem to compute the snapshot diff. The snapshot diff is
> represented as a SnapshotDiffReport internally. In later jiras we will add
> support to present the SnapshotDiffReport to end users.
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