Likkey opened a new pull request, #4649:
URL: https://github.com/apache/hadoop/pull/4649
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### Description of PR
Add Precondition.checkArgument() for minimumRedundantVolumes to ensure that
the value is greater than the number of NameNode storage volumes to avoid never
being able to turn off safe mode afterwards.
JIRA:[[HDFS-16697](https://issues.apache.org/jira/browse/HDFS-16697)](
### How was this patch tested?
It is found that “dfs.namenode.resource.checked.volumes.minimum” lacks a
condition check and an associated exception handling mechanism, which makes it
impossible to find the root cause of the impact when a misconfiguration occurs.
This patch provides a check of the configuration items，it will throw a
IllegalArgumentException and detailed error message when the value of
"dfs.namenode.resource.checked.volumes.minimum" is set greater than the number
of NameNode storage volumes to avoid the misconfiguration from affecting the
subsequent operation of the program.
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