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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-9098) Erasure coding: emulate race conditions among striped streamers in write pipeline
Date Wed, 18 Jan 2017 22:53:26 GMT

    [ https://issues.apache.org/jira/browse/HDFS-9098?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15828925#comment-15828925
] 

Hadoop QA commented on HDFS-9098:
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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  0s{color} | {color:blue}
Docker mode activated. {color} |
| {color:red}-1{color} | {color:red} patch {color} | {color:red}  0m  4s{color} | {color:red}
HDFS-9098 does not apply to trunk. Rebase required? Wrong Branch? See https://wiki.apache.org/hadoop/HowToContribute
for help. {color} |
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|| Subsystem || Report/Notes ||
| JIRA Issue | HDFS-9098 |
| JIRA Patch URL | https://issues.apache.org/jira/secure/attachment/12768447/HDFS-9098.00.patch
|
| Console output | https://builds.apache.org/job/PreCommit-HDFS-Build/18197/console |
| Powered by | Apache Yetus 0.5.0-SNAPSHOT   http://yetus.apache.org |


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> Erasure coding: emulate race conditions among striped streamers in write pipeline
> ---------------------------------------------------------------------------------
>
>                 Key: HDFS-9098
>                 URL: https://issues.apache.org/jira/browse/HDFS-9098
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: erasure-coding
>    Affects Versions: 3.0.0-alpha1
>            Reporter: Zhe Zhang
>            Assignee: Zhe Zhang
>         Attachments: HDFS-9098.00.patch, HDFS-9098.wip.patch
>
>
> Apparently the interleaving of events among {{StripedDataStreamer}}'s is very tricky
to handle. [~walter.k.su] and [~jingzhao] have discussed several race conditions under HDFS-9040.
> Let's use FaultInjector to emulate different combinations of interleaved events.
> In particular, we should consider inject delays in the following places:
> # {{Streamer#endBlock}}
> # {{Streamer#locateFollowingBlock}}
> # {{Streamer#updateBlockForPipeline}}
> # {{Streamer#updatePipeline}}
> # {{OutputStream#writeChunk}}
> # {{OutputStream#close}}



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