liying created HDFS-14635:
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Summary: Support to refresh the rack awareness dynamically
Key: HDFS-14635
URL: https://issues.apache.org/jira/browse/HDFS-14635
Project: Hadoop HDFS
Issue Type: Improvement
Components: hdfs
Affects Versions: 2.7.2
Reporter: liying
At present , there are two ways to load the rack script in the hadoop codes.
The class ScriptBasedMapping is the cache way, and the class
ScriptBasedMapping#RawScriptBasedMapping is the way that
it will load script every time（every request）。 The cache is the good way to
implement this feature， because it consumes cpu performance if loading the
script for every quest。But here's another question that is we cann't refresh
the cache, so it is import to support to refresh the rack awareness dynamically.
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