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https://issues.apache.org/jira/browse/YARN-9899?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16967513#comment-16967513
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Peter Bacsko commented on YARN-9899:
------------------------------------
Fixed a couple of minor things in v5. Also, if args.length == 0, then we
display a help instead of throwing an exception.
[~snemeth] could you check out patch v5 when you have some time?
> Migration tool that help to generate CS config based on FS config [Phase 2]
> ----------------------------------------------------------------------------
>
> Key: YARN-9899
> URL: https://issues.apache.org/jira/browse/YARN-9899
> Project: Hadoop YARN
> Issue Type: Sub-task
> Reporter: Szilard Nemeth
> Assignee: Peter Bacsko
> Priority: Major
> Attachments: YARN-9899-001.patch, YARN-9899-002.patch,
> YARN-9899-003.patch, YARN-9899-004.patch, YARN-9899-005.patch
>
>
> YARN-9699 laid down the groundworks of a converter from FS to CS config.
> During the development of the converter, we came up with the following things
> to fix.
> 1. If we don't specify a mandatory option, we have this stacktrace for
> example:
>
> {code:java}
> org.apache.commons.cli.MissingOptionException: Missing required option: o
> at org.apache.commons.cli.Parser.checkRequiredOptions(Parser.java:299)
> at org.apache.commons.cli.Parser.parse(Parser.java:231)
> at org.apache.commons.cli.Parser.parse(Parser.java:85)
> at
> org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.converter.FSConfigToCSConfigArgumentHandler.parseAndConvert(FSConfigToCSConfigArgumentHandler.java:100)
> at
> org.apache.hadoop.yarn.server.resourcemanager.ResourceManager.main(ResourceManager.java:1572){code}
>
> We should provide a more concise and meaningful error message (without
> stacktrace on the CLI, but we should log the exception with stacktrace to the
> RM log).
> An explanation of the missing option is also required.
> 2. We may think about how to handle exceptions from commons CLI:
> MissingArgumentException vs. MissingOptionException
> 3. We need to provide a -h / --help option for the CLI that prints all the
> possible options / arguments.
> 4. Last but not least: We should move the CLI command to a more reasonable
> place:
> As YARN-9699 implemented it, the command can be invoked like:
> {code:java}
> /opt/hadoop/bin/yarn resourcemanager -convert-fs-configuration -y
> /opt/hadoop/etc/hadoop/yarn-site.xml -f
> /opt/hadoop/etc/hadoop/fair-scheduler.xml -r
> ~systest/sample-rules-config.properties -o /tmp/fs-cs-output
> {code}
> This is problematic, as if YARN RM is already running, we need to stop it in
> order to start the RM again with the conversion switch.
> 5. Add unit test coverage for {{QueuePlacementConverter}}
> 6. Close some feature gaps.
>
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