slfan1989 opened a new pull request, #4250:
URL: https://github.com/apache/hadoop/pull/4250
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### Description of PR
YARN-11121 - Conditional judgment Add in getClusterMetrics
https://issues.apache.org/jira/browse/YARN-11121
Currently getClusterMetrics need to check request is null
### How was this patch tested?
### For code changes:
add conditional judgment to fIx if request is null
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