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https://issues.apache.org/jira/browse/HDFS-8828?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14707441#comment-14707441
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Hudson commented on HDFS-8828:
------------------------------
FAILURE: Integrated in Hadoop-Yarn-trunk-Java8 #294 (See
[https://builds.apache.org/job/Hadoop-Yarn-trunk-Java8/294/])
HDFS-8828. Utilize Snapshot diff report to build diff copy list in distcp.
(Yufei Gu via Yongjun Zhang) (yzhang: rev
0bc15cb6e60dc60885234e01dec1c7cb4557a926)
*
hadoop-tools/hadoop-distcp/src/main/java/org/apache/hadoop/tools/CopyListing.java
*
hadoop-tools/hadoop-distcp/src/main/java/org/apache/hadoop/tools/SimpleCopyListing.java
*
hadoop-tools/hadoop-distcp/src/test/java/org/apache/hadoop/tools/TestDistCpSync.java
*
hadoop-tools/hadoop-distcp/src/main/java/org/apache/hadoop/tools/DistCpOptions.java
* hadoop-tools/hadoop-distcp/src/main/java/org/apache/hadoop/tools/DistCp.java
* hadoop-tools/hadoop-distcp/src/main/java/org/apache/hadoop/tools/DiffInfo.java
* hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
*
hadoop-tools/hadoop-distcp/src/main/java/org/apache/hadoop/tools/DistCpSync.java
*
hadoop-tools/hadoop-distcp/src/test/java/org/apache/hadoop/tools/TestOptionsParser.java
> Utilize Snapshot diff report to build diff 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
> Fix For: 2.8.0
>
> 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, HDFS-8828.011.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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