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Date: Wed, 19 Aug 2015 18:54:46 +0000 (UTC)
From: "Hadoop QA (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
Message-ID: <JIRA.12849537.1438068522000.110245.1440010486872@Atlassian.JIRA>
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Subject: [jira] [Commented] (HDFS-8828) Utilize Snapshot diff report to
 build copy list in distcp
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    [ https://issues.apache.org/jira/browse/HDFS-8828?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14703563#comment-14703563 ] 

Hadoop QA commented on HDFS-8828:
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| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:red}-1{color} | javac |   0m  6s | The patch appears to cause the build to fail. |
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|| Subsystem || Report/Notes ||
| Patch URL | http://issues.apache.org/jira/secure/attachment/12751292/HDFS-8828.010.patch |
| Optional Tests | javadoc javac unit findbugs checkstyle |
| git revision | trunk / f61120d |
| Console output | https://builds.apache.org/job/PreCommit-HDFS-Build/12044/console |


This message was automatically generated.

> Utilize Snapshot diff report to build copy list in distcp
> ---------------------------------------------------------
>
>                 Key: HDFS-8828
>                 URL: https://issues.apache.org/jira/browse/HDFS-8828
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: distcp, snapshots
>            Reporter: Yufei Gu
>            Assignee: Yufei Gu
>         Attachments: HDFS-8828.001.patch, HDFS-8828.002.patch, HDFS-8828.003.patch, HDFS-8828.004.patch, HDFS-8828.005.patch, HDFS-8828.006.patch, HDFS-8828.007.patch, HDFS-8828.008.patch, HDFS-8828.009.patch, HDFS-8828.010.patch
>
>
> Some users reported huge time cost to build file copy list in distcp. (30 hours for 1.6M files). We can leverage snapshot diff report to build file copy list including files/dirs which are changes only between two snapshots (or a snapshot and a normal dir). It speed up the process in two folds: 1. less copy list building time. 2. less file copy MR jobs.
> HDFS snapshot diff report provide information about file/directory creation, deletion, rename and modification between two snapshots or a snapshot and a normal directory. HDFS-7535 synchronize deletion and rename, then fallback to the default distcp. So it still relies on default distcp to building complete list of files under the source dir. This patch only puts creation and modification files into the copy list based on snapshot diff report. We can minimize the number of files to copy. 


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