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https://issues.apache.org/jira/browse/HADOOP-19835?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18080530#comment-18080530
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ASF GitHub Bot commented on HADOOP-19835:
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pan3793 commented on PR #8331:
URL: https://github.com/apache/hadoop/pull/8331#issuecomment-4439613523
ping @steveloughran @K0K0V0K because you might be the only one who made
changes in the MR module recently. Do you have concerns about making AM class
configurable? the proposed config name is `yarn.app.mapreduce.am.class`
> Make MapReduce Application Master class configurable in YARNRunner
> ------------------------------------------------------------------
>
> Key: HADOOP-19835
> URL: https://issues.apache.org/jira/browse/HADOOP-19835
> Project: Hadoop Common
> Issue Type: Bug
> Components: mapreduce
> Affects Versions: 3.4.3
> Reporter: Lewis John McGibbney
> Assignee: Lewis John McGibbney
> Priority: Minor
> Labels: patch, pull-request-available
>
> YARNRunner currently always uses {{MRJobConfig.APPLICATION_MASTER_CLASS}}
> when building the command to start the Application Master, and does not read
> {{{}yarn.app.mapreduce.am{}}}. As a result, custom AM classes (e.g.
> Celeborn’s {{{}MRAppMasterWithCeleborn{}}}) are never used when submitting
> jobs via the standard job client.
> This patch changes YARNRunner to take the AM class from configuration: it
> uses {{jobConf.get("yarn.app.mapreduce.am",
> MRJobConfig.APPLICATION_MASTER_CLASS)}} and passes that value into the launch
> arguments. If {{yarn.app.mapreduce.am}} is set, that class is used; otherwise
> behavior is unchanged (default AM class). This allows remote shuffle and
> other custom AMs to be used without forking the job client.
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