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https://issues.apache.org/jira/browse/YARN-8029?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16399006#comment-16399006
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Jim Brennan commented on YARN-8029:
-----------------------------------
There was a related discussion in [HADOOP-11640] about allowing the user to
specify an alternate delimiter or adding an escaping mechanism.
I think in this case, the better solution would be to change the docker runtime
environment variables to use a different separator - semicolon, or pipe, or
something else.
> YARN_CONTAINER_RUNTIME_DOCKER_MOUNTS should not use commas as separators
> ------------------------------------------------------------------------
>
> Key: YARN-8029
> URL: https://issues.apache.org/jira/browse/YARN-8029
> Project: Hadoop YARN
> Issue Type: Bug
> Components: yarn
> Affects Versions: 3.0.0
> Reporter: Jim Brennan
> Priority: Major
>
> The following docker-related environment variables specify a comma-separated
> list of mounts:
> YARN_CONTAINER_RUNTIME_DOCKER_LOCAL_RESOURCE_MOUNTS
> YARN_CONTAINER_RUNTIME_DOCKER_MOUNTS
> This is a problem because hadoop -Dmapreduce.map.env and related options use
> comma as a delimiter. So if I put more than one mount in
> YARN_CONTAINER_RUNTIME_DOCKER_MOUNTS the comma in the variable will be
> treated as a delimiter for the hadoop command line option and all but the
> first mount will be ignored.
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