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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-7535) Utilize Snapshot diff report for distcp
Date Wed, 18 Feb 2015 01:55:13 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7535?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14325295#comment-14325295
] 

Hadoop QA commented on HDFS-7535:
---------------------------------

{color:red}-1 overall{color}.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12699392/HDFS-7535.001.patch
  against trunk revision 685af8a.

    {color:green}+1 @author{color}.  The patch does not contain any @author tags.

    {color:green}+1 tests included{color}.  The patch appears to include 1 new or modified
test files.

      {color:red}-1 javac{color}.  The applied patch generated 1156 javac compiler warnings
(more than the trunk's current 1155 warnings).

    {color:green}+1 javadoc{color}.  There were no new javadoc warning messages.

    {color:green}+1 eclipse:eclipse{color}.  The patch built with eclipse:eclipse.

    {color:red}-1 findbugs{color}.  The patch appears to introduce 1 new Findbugs (version
2.0.3) warnings.

    {color:green}+1 release audit{color}.  The applied patch does not increase the total number
of release audit warnings.

    {color:green}+1 core tests{color}.  The patch passed unit tests in hadoop-tools/hadoop-distcp.

Test results: https://builds.apache.org/job/PreCommit-HDFS-Build/9606//testReport/
Findbugs warnings: https://builds.apache.org/job/PreCommit-HDFS-Build/9606//artifact/patchprocess/newPatchFindbugsWarningshadoop-distcp.html
Javac warnings: https://builds.apache.org/job/PreCommit-HDFS-Build/9606//artifact/patchprocess/diffJavacWarnings.txt
Console output: https://builds.apache.org/job/PreCommit-HDFS-Build/9606//console

This message is automatically generated.

> Utilize Snapshot diff report for distcp
> ---------------------------------------
>
>                 Key: HDFS-7535
>                 URL: https://issues.apache.org/jira/browse/HDFS-7535
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: distcp, snapshots
>            Reporter: Jing Zhao
>            Assignee: Jing Zhao
>         Attachments: HDFS-7535.000.patch, HDFS-7535.001.patch
>
>
> Currently HDFS snapshot diff report can identify file/directory creation, deletion, rename
and modification under a snapshottable directory. We can use the diff report for distcp between
the primary cluster and a backup cluster to avoid unnecessary data copy. This is especially
useful when there is a big directory rename happening in the primary cluster: the current
distcp cannot detect the rename op thus this rename usually leads to large amounts of real
data copy.
> More details of the approach will come in the first comment.



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