Likkey opened a new pull request, #4848:
URL: https://github.com/apache/hadoop/pull/4848
…ndition check suite.
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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.
[[HDFS-16653](https://issues.apache.org/jira/browse/HDFS-16653)](https://issues.apache.org/jira/browse/HDFS-16653)
### How was this patch tested?
This patch adds maxEvictableMmapedSize that is "dfs.client.mmap.cache.size"
related Precondition check suite error message, 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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