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https://issues.apache.org/jira/browse/HDFS-9719?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15226273#comment-15226273
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Hadoop QA commented on HDFS-9719:
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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 7s {color} 
| {color:red} HDFS-9719 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 Patch URL | 
https://issues.apache.org/jira/secure/attachment/12792504/HDFS-9719-v7.patch |
| JIRA Issue | HDFS-9719 |
| Console output | 
https://builds.apache.org/job/PreCommit-HDFS-Build/15067/console |
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> Refactoring ErasureCodingWorker into smaller reusable constructs
> ----------------------------------------------------------------
>
>                 Key: HDFS-9719
>                 URL: https://issues.apache.org/jira/browse/HDFS-9719
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>            Reporter: Kai Zheng
>            Assignee: Kai Zheng
>         Attachments: HDFS-9719-v1.patch, HDFS-9719-v2.patch, 
> HDFS-9719-v3.patch, HDFS-9719-v4.patch, HDFS-9719-v5.patch, 
> HDFS-9719-v6.patch, HDFS-9719-v7.patch
>
>
> This would suggest and refactor {{ErasureCodingWorker}} into smaller 
> constructs to be reused in other places like block group checksum computing 
> in datanode side. As discussed in HDFS-8430 and implemented in HDFS-9694 
> patch, checksum computing for striped block groups would be distributed to 
> datanode in the group, where data block data should be able to be 
> reconstructed when missed/corrupted to recompute the block checksum. The most 
> needed codes are in the current ErasureCodingWorker and could be reused in 
> order to avoid duplication. Fortunately, we have very good and complete 
> tests, which would make the refactoring much easier. The refactoring will 
> also help a lot for subsequent tasks in phase II for non-striping erasure 
> coded files and blocks. 



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