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https://issues.apache.org/jira/browse/YARN-7244?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16184239#comment-16184239
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Kuhu Shukla commented on YARN-7244:
-----------------------------------
Thank you [~jlowe], [~sunilg] for the review/comments.
bq. We could make a pull API where the aux service can essentially directly
call the NM's LocalDirHandlerService for getting a path to read or a path to
write, then the aux service doesn't even have to manage the directories itself
if all it cares about is finding a place to write or read.
A pull model where the Shuffle handler /aux service does not maintain valid
dirs state would be my preference but the other pull approach would work too. I
will start reworking the patch in the meantime and will finalize based on what
we decide. Appreciate your thoughts.
> ShuffleHandler is not aware of disks that are added
> ---------------------------------------------------
>
> Key: YARN-7244
> URL: https://issues.apache.org/jira/browse/YARN-7244
> Project: Hadoop YARN
> Issue Type: Bug
> Reporter: Kuhu Shukla
> Assignee: Kuhu Shukla
> Attachments: YARN-7244.001.patch, YARN-7244.002.patch
>
>
> The ShuffleHandler permanently remembers the list of "good" disks on NM
> startup. If disks later are added to the node then map tasks will start using
> them but the ShuffleHandler will not be aware of them. The end result is that
> the data cannot be shuffled from the node leading to fetch failures and
> re-runs of the map tasks.
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