[jira] [Commented] (MAPREDUCE-7131) Job History Server has race condition where it moves files from intermediate to finished but thinks file is in intermediate

["Varun Saxena (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/MAPREDUCE-7131?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16594688#comment-16594688 ] 

Varun Saxena commented on MAPREDUCE-7131:
-----------------------------------------

[~erwaman], added you to the list of contributors and assigned the JIRA to you

> Job History Server has race condition where it moves files from intermediate to finished but thinks file is in intermediate
> ---------------------------------------------------------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-7131
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-7131
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>    Affects Versions: 2.7.4
>            Reporter: Anthony Hsu
>            Assignee: Anthony Hsu
>            Priority: Major
>
> This is the race condition that can occur:
> # during the first *scanIntermediateDirectory()*, *HistoryFileInfo.moveToDone()* is scheduled for job j1
> # during the second *scanIntermediateDirectory()*, j1 is found again and put in the *fileStatusList* to process
> # *HistoryFileInfo.moveToDone()* is processed in another thread and history files are moved to the finished directory
> # the *HistoryFileInfo* for j1 is removed from *jobListCache*
> # the j1 in *fileStatusList* is processed and a new *HistoryFileInfo* for j1 is created (history, conf, and summary files will point to the intermediate user directory, and state will be IN_INTERMEDIATE)
> # *moveToDone()* is scheduled for this new j1
> # *moveToDone()* fails during *moveToDoneNow()* for the history file because the source path in the intermediate directory does not exist
> From this point on, while the new j1 *HistoryFileInfo* is in the *jobListCache*, the JobHistoryServer will think the history file is in the intermediate directory. If a user queries this job in the JobHistoryServer UI, they will get
> {code}
> org.apache.hadoop.yarn.exceptions.YarnRuntimeException: Could not load history file <scheme>://<host>:<port>/mr-history/intermediate/<user>/job_1529348381246_27275711-1535123223269-<user>-<jobname>-1535127026668-1-0-SUCCEEDED-<queue>-1535126980787.jhist
> {code}
> Noticed this issue while running 2.7.4, but the race condition seems to still exist in trunk.



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