[YARN-9246] NPE when executing a command yarn node -status or -states without additional arguments

• Type: Bug
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: 3.3.0, 3.2.3
• Component/s: client
• Labels: pull-request-available
• Assignee: Masahiro Tanaka
• Reporter: Masahiro Tanaka
• Created: 28/Jan/19 22:36
• Updated: 16/Jun/21 08:35
• Resolved: 05/Feb/19 18:22

Description

yarn node command should not print NPE even if there are some missing arguments.

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$

Issue Links

• duplicates: YARN-10817 Avoid java.lang.NullPointerException when use yarn shell
• links to: GitHub Pull Request #3094