Ajith S created YARN-5826:
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Summary: HelpFormatter ordered with insertion order
Key: YARN-5826
URL: https://issues.apache.org/jira/browse/YARN-5826
Project: Hadoop YARN
Issue Type: Improvement
Reporter: Ajith S
Assignee: Ajith S
Priority: Minor
Here is a sample help
{code}
usage: yarn node [-list [-states <States>|-all] | -status <NodeId>]
-all Works with -list to list all nodes.
-list List all running nodes. Supports optional use of
-states to filter nodes based on node state, all -all
to list all nodes.
-states <States> Works with -list to filter nodes based on input
comma-separated list of node states.
-status <NodeId> Prints the status report of the node.
{code}
instead, it will be better if the options were ordered
{code}
usage: yarn node [-list [-states <States>|-all] | -status <NodeId>]
-list List all running nodes.
-states <States> Works with -list to filter nodes based on input
comma-separated list of node states.
-all Works with -list to list all nodes.
-status <NodeId> Prints the status report of the node.
{code}
Currently the HelpFormatter provided by commons-cli-1.2 orders the options
alphabetically while printing. Even though there is a option to add a custom
comparator, it may be difficult. As of v1.3 we can just do
{code}
HelpFormatter formatter = new HelpFormatter();
formatter.setOptionComparator(null);
{code}
so that sorting is skipped and the insertion order is maintained
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