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https://issues.apache.org/jira/browse/HDFS-7878?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16210116#comment-16210116
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Hadoop QA commented on HDFS-7878:
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| {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} docker {color} | {color:red}  2m 
50s{color} | {color:red} Docker failed to build yetus/hadoop:0de40f0. {color} |
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|| Subsystem || Report/Notes ||
| JIRA Issue | HDFS-7878 |
| JIRA Patch URL | 
https://issues.apache.org/jira/secure/attachment/12892907/HDFS-7878.14.patch |
| Console output | 
https://builds.apache.org/job/PreCommit-HDFS-Build/21739/console |
| Powered by | Apache Yetus 0.6.0-SNAPSHOT   http://yetus.apache.org |


This message was automatically generated.



> API - expose an unique file identifier
> --------------------------------------
>
>                 Key: HDFS-7878
>                 URL: https://issues.apache.org/jira/browse/HDFS-7878
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>            Reporter: Sergey Shelukhin
>            Assignee: Sergey Shelukhin
>              Labels: BB2015-05-TBR
>         Attachments: HDFS-7878.01.patch, HDFS-7878.02.patch, 
> HDFS-7878.03.patch, HDFS-7878.04.patch, HDFS-7878.05.patch, 
> HDFS-7878.06.patch, HDFS-7878.07.patch, HDFS-7878.08.patch, 
> HDFS-7878.09.patch, HDFS-7878.10.patch, HDFS-7878.11.patch, 
> HDFS-7878.12.patch, HDFS-7878.13.patch, HDFS-7878.14.patch, HDFS-7878.patch
>
>
> See HDFS-487.
> Even though that is resolved as duplicate, the ID is actually not exposed by 
> the JIRA it supposedly duplicates.
> INode ID for the file should be easy to expose; alternatively ID could be 
> derived from block IDs, to account for appends...
> This is useful e.g. for cache key by file, to make sure cache stays correct 
> when file is overwritten.



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