Likkey opened a new pull request, #4707:
URL: https://github.com/apache/hadoop/pull/4707
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### Description of PR
When the configuration item “dfs.client.mmap.cache.size” is set to a
negative number, it will cause /hadoop/bin hdfs dfsadmin -safemode provides all
the operation options including enter, leave, get, wait and forceExit are
invalid, the terminal returns security mode is null and no exceptions are
thrown.
### How was this patch tested?
This patch improves the check mechanism related to
“dfs.client.mmap.cache.size”, and give a clear indication when the
configuration is abnormal in order to solve the problem in time and reduce the
impact on the safe mode related operations.
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