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From "Victor Wong (Jira)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-15447) Change "java.io.tmpdir" of JM/TM on Yarn to "{{PWD}}/tmp"
Date Thu, 02 Jan 2020 03:27:00 GMT

    [ https://issues.apache.org/jira/browse/FLINK-15447?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17006558#comment-17006558

Victor Wong commented on FLINK-15447:

[~yunta] [~klion26] Thanks for your reply :)

_What caused the "/tmp" directory full?_
It may not be caused by Flink applications since other applications like MapReduce/Spark would
run on the same Yarn cluster too. 
I think it's not safe to use "/tmp" directory since it's shared by other tasks.  Tasks, like
the Flink TaskManager, could make use of its own working directory assigned by Yarn.

_Flink already set io.tmp.dirs as 'LOCAL_DIRS' in YARN_
This config can not solve the problem completely, since the third-party libraries used by
users may still use "java.io.tmpdir" property.

There is similar discussion here: https://issues.apache.org/jira/browse/HADOOP-2735

> Change "java.io.tmpdir"  of JM/TM on Yarn to "{{PWD}}/tmp" 
> -----------------------------------------------------------
>                 Key: FLINK-15447
>                 URL: https://issues.apache.org/jira/browse/FLINK-15447
>             Project: Flink
>          Issue Type: Improvement
>          Components: Deployment / YARN
>    Affects Versions: 1.9.1
>            Reporter: Victor Wong
>            Priority: Major
> Currently, when running Flink on Yarn, the "java.io.tmpdir" property is set to the default
value, which is "/tmp". 
> Sometimes we ran into exceptions caused by a full "/tmp" directory, which would not be
cleaned automatically after applications finished.
> I think we can set "java.io.tmpdir" to "{{{{PWD}}}}/tmp" directory, or something similar.
"{{{{PWD}}}}" will be replaced with the true working directory of JM/TM by Yarn, which will
be cleaned automatically.

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