Github user li-zhihui commented on the pull request:
https://github.com/apache/spark/pull/1616#issuecomment-54408600
@JoshRosen @andrewor14
I test the patch in yarn mode, and the <code>localDir</code> is a
per-application temporary directory in this mode. Now I know it is a problem in
standalone(and mesos) mode.
<code>targetDir</code>(from <code>SparkFiles.getRootDirectory</code>) is
per-executor temporary directory(in my case ,it is
<code>/home/frank/hdfs/yarn/nm-local-dir/usercache/frank/appcache/application_1409795343243_0002/container_1409795343243_0002_01_000126/./</code>),
I think we can use <code>targetDir + "../"</code> as per-application directory
to save the cache file.
BTW: The <code>timestamp</code> follow this code's logic:
https://github.com/apache/spark/blob/master/core/src/main/scala/org/apache/spark/executor/Executor.scala#L323
Although I don't understand why the timestamp could be changed in an
application's life time.
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