yangjiandan opened a new pull request, #7527:
URL: https://github.com/apache/hadoop/pull/7527
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### Description of PR
Currently, the two implementations of
org.apache.hadoop.security.SecurityUtil.HostResolver, StandardHostResolver and
QualifiedHostResolver in Hadoop performs hostname resolution each time it is
called. Each heartbeat between the AM and RM causes the RM to invoke the
HostResolver#getByName method once. In large-scale clusters running numerous
applications, this results in a high frequency of redundant hostname
resolutions.
see HADOOP-19447
### How was this patch tested?
current UT and newly developed UT
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