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https://issues.apache.org/jira/browse/HADOOP-16018?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16746049#comment-16746049
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Hadoop QA commented on HADOOP-16018:
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| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:blue}0{color} | {color:blue} reexec {color} | {color:blue} 26m 
34s{color} | {color:blue} Docker mode activated. {color} |
|| || || || {color:brown} Prechecks {color} ||
| {color:blue}0{color} | {color:blue} findbugs {color} | {color:blue}  0m  
1s{color} | {color:blue} Findbugs executables are not available. {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 1 new or modified test 
files. {color} |
|| || || || {color:brown} branch-2 Compile Tests {color} ||
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 16m 
48s{color} | {color:green} branch-2 passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  0m 
30s{color} | {color:green} branch-2 passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green}  0m 
21s{color} | {color:green} branch-2 passed {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green}  0m 
40s{color} | {color:green} branch-2 passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  0m 
22s{color} | {color:green} branch-2 passed {color} |
|| || || || {color:brown} Patch Compile Tests {color} ||
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green}  0m 
31s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green}  0m 
22s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green}  0m 
22s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green}  0m 
15s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green}  0m 
29s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} whitespace {color} | {color:green}  0m 
 0s{color} | {color:green} The patch has no whitespace issues. {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green}  0m 
18s{color} | {color:green} the patch passed {color} |
|| || || || {color:brown} Other Tests {color} ||
| {color:red}-1{color} | {color:red} unit {color} | {color:red}974m 54s{color} 
| {color:red} hadoop-distcp in the patch failed. {color} |
| {color:red}-1{color} | {color:red} asflicense {color} | {color:red}  0m 
36s{color} | {color:red} The patch generated 4 ASF License warnings. {color} |
| {color:black}{color} | {color:black} {color} | {color:black}1023m 44s{color} 
| {color:black} {color} |
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|| Subsystem || Report/Notes ||
| Docker | Client=17.05.0-ce Server=17.05.0-ce Image:yetus/hadoop:a5f678f |
| JIRA Issue | HADOOP-16018 |
| JIRA Patch URL | 
https://issues.apache.org/jira/secure/attachment/12955268/HADOOP-16018-branch-2-005.patch
 |
| Optional Tests |  dupname  asflicense  compile  javac  javadoc  mvninstall  
mvnsite  unit  shadedclient  findbugs  checkstyle  |
| uname | Linux d5f3dbf19093 3.13.0-153-generic #203-Ubuntu SMP Thu Jun 14 
08:52:28 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux |
| Build tool | maven |
| Personality | /testptch/patchprocess/precommit/personality/provided.sh |
| git revision | branch-2 / a5f678f |
| maven | version: Apache Maven 3.3.9 
(bb52d8502b132ec0a5a3f4c09453c07478323dc5; 2015-11-10T16:41:47+00:00) |
| Default Java | 1.7.0_181 |
| unit | 
https://builds.apache.org/job/PreCommit-HADOOP-Build/15799/artifact/out/patch-unit-hadoop-tools_hadoop-distcp.txt
 |
|  Test Results | 
https://builds.apache.org/job/PreCommit-HADOOP-Build/15799/testReport/ |
| asflicense | 
https://builds.apache.org/job/PreCommit-HADOOP-Build/15799/artifact/out/patch-asflicense-problems.txt
 |
| Max. process+thread count | 220 (vs. ulimit of 10000) |
| modules | C: hadoop-tools/hadoop-distcp U: hadoop-tools/hadoop-distcp |
| Console output | 
https://builds.apache.org/job/PreCommit-HADOOP-Build/15799/console |
| Powered by | Apache Yetus 0.8.0   http://yetus.apache.org |


This message was automatically generated.



> DistCp won't reassemble chunks when blocks per chunk > 0
> --------------------------------------------------------
>
>                 Key: HADOOP-16018
>                 URL: https://issues.apache.org/jira/browse/HADOOP-16018
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: tools/distcp
>    Affects Versions: 3.2.0, 2.9.2
>            Reporter: Kai Xie
>            Assignee: Kai Xie
>            Priority: Major
>             Fix For: 3.0.4, 3.2.1, 3.1.3
>
>         Attachments: HADOOP-16018-002.patch, HADOOP-16018-branch-2-002.patch, 
> HADOOP-16018-branch-2-002.patch, HADOOP-16018-branch-2-003.patch, 
> HADOOP-16018-branch-2-004.patch, HADOOP-16018-branch-2-004.patch, 
> HADOOP-16018-branch-2-005.patch, HADOOP-16018-branch-2-005.patch, 
> HADOOP-16018.01.patch
>
>
> I was investigating why hadoop-distcp-2.9.2 won't reassemble chunks of the 
> same file when blocks per chunk has been set > 0.
> In the CopyCommitter::commitJob, this logic can prevent chunks from 
> reassembling if blocks per chunk is equal to 0:
> {code:java}
> if (blocksPerChunk > 0) {
>   concatFileChunks(conf);
> }
> {code}
> Then in CopyCommitter's ctor, blocksPerChunk is initialised from the config:
> {code:java}
> blocksPerChunk = context.getConfiguration().getInt(
> DistCpOptionSwitch.BLOCKS_PER_CHUNK.getConfigLabel(), 0);
> {code}
>  
> But here the config key DistCpOptionSwitch.BLOCKS_PER_CHUNK.getConfigLabel() 
> will always returns empty string because it is constructed without config 
> label:
> {code:java}
> BLOCKS_PER_CHUNK("",
> new Option("blocksperchunk", true, "If set to a positive value, files"
> + "with more blocks than this value will be split into chunks of "
> + "<blocksperchunk> blocks to be transferred in parallel, and "
> + "reassembled on the destination. By default, <blocksperchunk> is "
> + "0 and the files will be transmitted in their entirety without "
> + "splitting. This switch is only applicable when the source file "
> + "system implements getBlockLocations method and the target file "
> + "system implements concat method"))
> {code}
> As a result it will fall back to the default value 0 for blocksPerChunk, and 
> prevent the chunks from reassembling.
>  
>  



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