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https://issues.apache.org/jira/browse/HDFS-9820?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15208273#comment-15208273
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Hadoop QA commented on HDFS-9820:
---------------------------------

| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:blue}0{color} | {color:blue} reexec {color} | {color:blue} 0m 11s 
{color} | {color:blue} Docker mode activated. {color} |
| {color:green}+1{color} | {color:green} @author {color} | {color:green} 0m 0s 
{color} | {color:green} The patch does not contain any @author tags. {color} |
| {color:green}+1{color} | {color:green} test4tests {color} | {color:green} 0m 
0s {color} | {color:green} The patch appears to include 2 new or modified test 
files. {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 7m 
0s {color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 0m 15s 
{color} | {color:green} trunk passed with JDK v1.8.0_74 {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 0m 18s 
{color} | {color:green} trunk passed with JDK v1.7.0_95 {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green} 0m 
15s {color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green} 0m 23s 
{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} mvneclipse {color} | {color:green} 0m 
13s {color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green} 0m 
27s {color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 0m 13s 
{color} | {color:green} trunk passed with JDK v1.8.0_74 {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 0m 15s 
{color} | {color:green} trunk passed with JDK v1.7.0_95 {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 0m 
18s {color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 0m 12s 
{color} | {color:green} the patch passed with JDK v1.8.0_74 {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green} 0m 12s 
{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 0m 14s 
{color} | {color:green} the patch passed with JDK v1.7.0_95 {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green} 0m 14s 
{color} | {color:green} the patch passed {color} |
| {color:red}-1{color} | {color:red} checkstyle {color} | {color:red} 0m 13s 
{color} | {color:red} hadoop-tools/hadoop-distcp: patch generated 9 new + 133 
unchanged - 11 fixed = 142 total (was 144) {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green} 0m 20s 
{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} mvneclipse {color} | {color:green} 0m 
10s {color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} whitespace {color} | {color:green} 0m 
0s {color} | {color:green} Patch has no whitespace issues. {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green} 0m 
38s {color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 0m 10s 
{color} | {color:green} the patch passed with JDK v1.8.0_74 {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 0m 12s 
{color} | {color:green} the patch passed with JDK v1.7.0_95 {color} |
| {color:red}-1{color} | {color:red} unit {color} | {color:red} 8m 50s {color} 
| {color:red} hadoop-distcp in the patch failed with JDK v1.8.0_74. {color} |
| {color:red}-1{color} | {color:red} unit {color} | {color:red} 8m 8s {color} | 
{color:red} hadoop-distcp in the patch failed with JDK v1.7.0_95. {color} |
| {color:green}+1{color} | {color:green} asflicense {color} | {color:green} 0m 
22s {color} | {color:green} Patch does not generate ASF License warnings. 
{color} |
| {color:black}{color} | {color:black} {color} | {color:black} 30m 15s {color} 
| {color:black} {color} |
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|| Reason || Tests ||
| JDK v1.8.0_74 Failed junit tests | hadoop.tools.TestOptionsParser |
| JDK v1.7.0_95 Failed junit tests | hadoop.tools.TestOptionsParser |
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|| Subsystem || Report/Notes ||
| Docker |  Image:yetus/hadoop:fbe3e86 |
| JIRA Patch URL | 
https://issues.apache.org/jira/secure/attachment/12794948/HDFS-9820.002.patch |
| JIRA Issue | HDFS-9820 |
| Optional Tests |  asflicense  compile  javac  javadoc  mvninstall  mvnsite  
unit  findbugs  checkstyle  |
| uname | Linux 7e359f0a9fc0 3.13.0-36-lowlatency #63-Ubuntu SMP PREEMPT Wed 
Sep 3 21:56:12 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux |
| Build tool | maven |
| Personality | /testptch/hadoop/patchprocess/precommit/personality/provided.sh 
|
| git revision | trunk / a107cee |
| Default Java | 1.7.0_95 |
| Multi-JDK versions |  /usr/lib/jvm/java-8-oracle:1.8.0_74 
/usr/lib/jvm/java-7-openjdk-amd64:1.7.0_95 |
| findbugs | v3.0.0 |
| checkstyle | 
https://builds.apache.org/job/PreCommit-HDFS-Build/14906/artifact/patchprocess/diff-checkstyle-hadoop-tools_hadoop-distcp.txt
 |
| unit | 
https://builds.apache.org/job/PreCommit-HDFS-Build/14906/artifact/patchprocess/patch-unit-hadoop-tools_hadoop-distcp-jdk1.8.0_74.txt
 |
| unit | 
https://builds.apache.org/job/PreCommit-HDFS-Build/14906/artifact/patchprocess/patch-unit-hadoop-tools_hadoop-distcp-jdk1.7.0_95.txt
 |
| unit test logs |  
https://builds.apache.org/job/PreCommit-HDFS-Build/14906/artifact/patchprocess/patch-unit-hadoop-tools_hadoop-distcp-jdk1.8.0_74.txt
 
https://builds.apache.org/job/PreCommit-HDFS-Build/14906/artifact/patchprocess/patch-unit-hadoop-tools_hadoop-distcp-jdk1.7.0_95.txt
 |
| JDK v1.7.0_95  Test Results | 
https://builds.apache.org/job/PreCommit-HDFS-Build/14906/testReport/ |
| modules | C: hadoop-tools/hadoop-distcp U: hadoop-tools/hadoop-distcp |
| Console output | 
https://builds.apache.org/job/PreCommit-HDFS-Build/14906/console |
| Powered by | Apache Yetus 0.2.0   http://yetus.apache.org |


This message was automatically generated.



> Improve distcp to support efficient restore to an earlier snapshot
> ------------------------------------------------------------------
>
>                 Key: HDFS-9820
>                 URL: https://issues.apache.org/jira/browse/HDFS-9820
>             Project: Hadoop HDFS
>          Issue Type: New Feature
>          Components: distcp
>            Reporter: Yongjun Zhang
>            Assignee: Yongjun Zhang
>         Attachments: HDFS-9820.001.patch, HDFS-9820.002.patch
>
>
> HDFS-4167 intends to restore HDFS to the most recent snapshot, and there are 
> some complexity and challenges. 
> HDFS-7535 improved distcp performance by avoiding copying files that changed 
> name since last backup.
> On top of HDFS-7535, HDFS-8828 improved distcp performance when copying data 
> from source to target cluster, by only copying changed files since last 
> backup. The way it works is use snapshot diff to find out all files changed, 
> and copy the changed files only.
> See 
> https://blog.cloudera.com/blog/2015/12/distcp-performance-improvements-in-apache-hadoop/
> This jira is to propose a variation of HDFS-8828, to find out the files 
> changed in target cluster since last snapshot sx, and copy these from the 
> source target's same snapshot sx, to restore target cluster to sx.
> If a file/dir is
> - renamed, rename it back
> - created in target cluster, delete it
> - modified, put it to the copy list
> - run distcp with the copy list, copy from the source cluster's corresponding 
> snapshot
> This could be a new command line switch -rdiff in distcp.
> HDFS-4167 would still be nice to have. It just seems to me that HDFS-9820 
> would hopefully be easier to implement.



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