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From "liying (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-14635) Support to refresh the rack awareness dynamically
Date Mon, 08 Jul 2019 06:24:00 GMT
liying created HDFS-14635:
-----------------------------

             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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