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Posted to mapreduce-issues@hadoop.apache.org by "Hadoop QA (JIRA)" <ji...@apache.org> on 2017/03/05 15:09:32 UTC
[jira] [Commented] (MAPREDUCE-6854) Each map task should create a
unique temporary name that includes an object name
[ https://issues.apache.org/jira/browse/MAPREDUCE-6854?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15896291#comment-15896291 ]
Hadoop QA commented on MAPREDUCE-6854:
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|| Vote || Subsystem || Runtime || Comment ||
| {color:blue}0{color} | {color:blue} reexec {color} | {color:blue} 0m 29s {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 1 new or modified test files. {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 12m 2s {color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 0m 18s {color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green} 0m 14s {color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green} 0m 19s {color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} mvneclipse {color} | {color:green} 1m 10s {color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green} 0m 23s {color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 0m 14s {color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 0m 15s {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 {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green} 0m 14s {color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green} 0m 10s {color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green} 0m 15s {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:red}-1{color} | {color:red} whitespace {color} | {color:red} 0m 0s {color} | {color:red} The patch 32 line(s) with tabs. {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green} 0m 28s {color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 0m 11s {color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} unit {color} | {color:green} 12m 50s {color} | {color:green} hadoop-distcp in the patch passed. {color} |
| {color:green}+1{color} | {color:green} asflicense {color} | {color:green} 0m 15s {color} | {color:green} The patch does not generate ASF License warnings. {color} |
| {color:black}{color} | {color:black} {color} | {color:black} 30m 39s {color} | {color:black} {color} |
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|| Subsystem || Report/Notes ||
| Docker | Image:yetus/hadoop:a9ad5d6 |
| JIRA Patch URL | https://issues.apache.org/jira/secure/attachment/12856174/HADOOP-6854-001.patch |
| JIRA Issue | MAPREDUCE-6854 |
| Optional Tests | asflicense compile javac javadoc mvninstall mvnsite unit findbugs checkstyle |
| uname | Linux 41cc994e7287 4.4.0-43-generic #63-Ubuntu SMP Wed Oct 12 13:48:03 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux |
| Build tool | maven |
| Personality | /testptch/hadoop/patchprocess/precommit/personality/provided.sh |
| git revision | trunk / c8bd8ac |
| Default Java | 1.8.0_121 |
| findbugs | v3.0.0 |
| whitespace | https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/6910/artifact/patchprocess/whitespace-tabs.txt |
| Test Results | https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/6910/testReport/ |
| modules | C: hadoop-tools/hadoop-distcp U: hadoop-tools/hadoop-distcp |
| Console output | https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/6910/console |
| Powered by | Apache Yetus 0.3.0 http://yetus.apache.org |
This message was automatically generated.
> Each map task should create a unique temporary name that includes an object name
> --------------------------------------------------------------------------------
>
> Key: MAPREDUCE-6854
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-6854
> Project: Hadoop Map/Reduce
> Issue Type: Improvement
> Components: distcp
> Affects Versions: 3.0.0-alpha2
> Reporter: Gil Vernik
> Labels: patch
> Fix For: 3.0.0-alpha2
>
> Attachments: HADOOP-6854-001.patch
>
>
> Consider an example: a local file "/data/a.txt" need to be copied into swift://container.service/data/a.txt
> The way distcp works is that first it will upload "/data/a.txt" into swift://container.mil01/data/.distcp.tmp.attempt_local2036034928_0001_m_000000_0
> Upon completion distcp will move swift://container.mil01/data/.distcp.tmp.attempt_local2036034928_0001_m_000000_0 into swift://container.mil01/data/a.txt
> ************************************
> The temporary file naming convention assumes that each map task will sequentially create objects as swift://container.mil01/.distcp.tmp.attempt_ID
> and then rename them to the final names. Most of Hadoop eco system components use object.name which is part of the temporary name, however distcp doesn't use such approach.
> This JIRA propose to add a configuration key indicating that temporary objects will also include object name as part of their temporary file name,
> For example
> "/data/a.txt" will be uploaded into
> "swift://container.mil01/data/a.txt.distcp.tmp.attempt_local2036034928_0001_m_000000_0"
> "a.txt.distcp.tmp.attempt_local2036034928_0001_m_000000_0" doesn't affects flows in the access drivers, since "a.txt" is not considered as a sub-directory so no special operations will be taken.
> The benefits of the patch :
> 1. Temp object names will be better distributed in object stores, since they all has different prefix.
> 2. Sometimes it's not possible to debug what data is copied and what failed. Sometimes temp files are not renamed, it will be much better if expecting temp name - one can figure what object names were copied.
> 3. Different systems may expect "a.txt.distcp.tmp.attempt_local2036034928_0001_m_000000_0" and extract value prior "distcp.tmp" thus getting destination object name.
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