Masahiro Tanaka created YARN-9273:
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Summary: Flexing a component of YARN service does not work as
documented when using relative number
Key: YARN-9273
URL: https://issues.apache.org/jira/browse/YARN-9273
Project: Hadoop YARN
Issue Type: Bug
Reporter: Masahiro Tanaka
Assignee: Masahiro Tanaka
[The
documents|https://hadoop.apache.org/docs/r3.2.0/hadoop-yarn/hadoop-yarn-site/yarn-service/QuickStart.html]
says,
"Relative changes are also supported for the ${NUMBER_OF_CONTAINERS} in the
flex command, such as +2 or -2." when you want to flex a component of a YARN
service.
I expected that {{yarn app -flex sleeper-service -component sleeper +1}}
increments the number of container, but actually it sets the number of
container to just one.
I guess ApiServiceClient#actionFlex treats flexing when executing the {{yarn
app -flex}}, and it just uses {{Long.parseLong}} to convert the argument like
{{+1}}, which doesn't care relative numbers.
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