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https://issues.apache.org/jira/browse/YARN-9246?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16758615#comment-16758615
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Suma Shivaprasad commented on YARN-9246:
----------------------------------------
Thanks [~masatana]. Will commit this by EOD today.
> NPE when executing a command yarn node -status or -states without additional
> arguments
> --------------------------------------------------------------------------------------
>
> Key: YARN-9246
> URL: https://issues.apache.org/jira/browse/YARN-9246
> Project: Hadoop YARN
> Issue Type: Bug
> Components: client
> Reporter: Masahiro Tanaka
> Assignee: Masahiro Tanaka
> Priority: Minor
> Attachments: YARN-9246.001.patch, YARN-9246.002.patch
>
>
> yarn node command should not print NPE even if there are some missing
> arguments.
> {code}
> ubuntu@ip-172-31-0-78:~/hadoop-3.3.0-SNAPSHOT$ ./bin/yarn node -states
> Missing argument for options
> usage: node
> -all Works with -list to list all nodes.
> -help Displays help for all commands.
> -list List all running nodes. Supports optional use of
> -states to filter nodes based on node state, all -all
> to list all nodes, -showDetails to display more
> details about each node.
> -showDetails Works with -list to show more details about each node.
> -states <States> Works with -list to filter nodes based on input
> comma-separated list of node states. The valid node
> state can be one of the following:
> NEW,RUNNING,UNHEALTHY,DECOMMISSIONED,LOST,REBOOTED,DEC
> OMMISSIONING,SHUTDOWN.
> -status <NodeId> Prints the status report of the node.
> Exception in thread "main" java.lang.NullPointerException
> at org.apache.hadoop.yarn.client.cli.YarnCLI.stop(YarnCLI.java:75)
> at org.apache.hadoop.yarn.client.cli.NodeCLI.main(NodeCLI.java:63)
> ubuntu@ip-172-31-0-78:~/hadoop-3.3.0-SNAPSHOT$ ./bin/yarn node -status
> Missing argument for options
> usage: node
> -all Works with -list to list all nodes.
> -help Displays help for all commands.
> -list List all running nodes. Supports optional use of
> -states to filter nodes based on node state, all -all
> to list all nodes, -showDetails to display more
> details about each node.
> -showDetails Works with -list to show more details about each node.
> -states <States> Works with -list to filter nodes based on input
> comma-separated list of node states. The valid node
> state can be one of the following:
> NEW,RUNNING,UNHEALTHY,DECOMMISSIONED,LOST,REBOOTED,DEC
> OMMISSIONING,SHUTDOWN.
> -status <NodeId> Prints the status report of the node.
> Exception in thread "main" java.lang.NullPointerException
> at org.apache.hadoop.yarn.client.cli.YarnCLI.stop(YarnCLI.java:75)
> at org.apache.hadoop.yarn.client.cli.NodeCLI.main(NodeCLI.java:63)
> ubuntu@ip-172-31-0-78:~/hadoop-3.3.0-SNAPSHOT$
> {code}
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