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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-13946) Document how HDFS updates timestamps in the FS spec; compare with object stores
Date Mon, 23 Jan 2017 14:25:26 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-13946?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15834649#comment-15834649
] 

Hadoop QA commented on HADOOP-13946:
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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}  0m 14s{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} mvninstall {color} | {color:green} 12m 48s{color}
| {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green}  1m  0s{color} |
{color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green}  0m 54s{color} |
{color:green} the patch passed {color} |
| {color:red}-1{color} | {color:red} whitespace {color} | {color:red}  0m  0s{color} | {color:red}
The patch has 3 line(s) that end in whitespace. Use git apply --whitespace=fix <<patch_file>>.
Refer https://git-scm.com/docs/git-apply {color} |
| {color:green}+1{color} | {color:green} asflicense {color} | {color:green}  0m 19s{color}
| {color:green} The patch does not generate ASF License warnings. {color} |
| {color:black}{color} | {color:black} {color} | {color:black} 15m 36s{color} | {color:black}
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|| Subsystem || Report/Notes ||
| Docker |  Image:yetus/hadoop:a9ad5d6 |
| JIRA Issue | HADOOP-13946 |
| JIRA Patch URL | https://issues.apache.org/jira/secure/attachment/12848909/HADOOP-13946-003.patch
|
| Optional Tests |  asflicense  mvnsite  |
| uname | Linux 2d91012570ca 3.13.0-103-generic #150-Ubuntu SMP Thu Nov 24 10:34:17 UTC 2016
x86_64 x86_64 x86_64 GNU/Linux |
| Build tool | maven |
| Personality | /testptch/hadoop/patchprocess/precommit/personality/provided.sh |
| git revision | trunk / 3fa0d54 |
| whitespace | https://builds.apache.org/job/PreCommit-HADOOP-Build/11495/artifact/patchprocess/whitespace-eol.txt
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| modules | C: hadoop-common-project/hadoop-common U: hadoop-common-project/hadoop-common
|
| Console output | https://builds.apache.org/job/PreCommit-HADOOP-Build/11495/console |
| Powered by | Apache Yetus 0.5.0-SNAPSHOT   http://yetus.apache.org |


This message was automatically generated.



> Document how HDFS updates timestamps in the FS spec; compare with object stores
> -------------------------------------------------------------------------------
>
>                 Key: HADOOP-13946
>                 URL: https://issues.apache.org/jira/browse/HADOOP-13946
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: documentation, fs
>    Affects Versions: 2.7.3
>            Reporter: Steve Loughran
>            Assignee: Steve Loughran
>            Priority: Minor
>             Fix For: 2.8.0, 3.0.0-alpha2
>
>         Attachments: HADOOP-13946-001.patch, HADOOP-13946-002.patch, HADOOP-13946-003.patch
>
>
> SPARK-17159 shows that the behavior of when HDFS updates timestamps isn't well documented.
Document these in the FS spec.
> I'm not going to add tests for this, as it is so very dependent on FS implementations,
as in "POSIX filesystems may behave differently from HDFS". If someone knows what happens
there, their contribution is welcome.



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