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From mxm <...@git.apache.org>
Subject [GitHub] flink issue #2499: [FLINK-4485] close and remove user class loader after job...
Date Fri, 16 Sep 2016 10:00:09 GMT
Github user mxm commented on the issue:

    https://github.com/apache/flink/pull/2499
  
    Thanks! Just a few words to @nielsbasjes who reported the issue. I've tested the fix using
the test instructions you provided. Even before this fix, I could get rid of the temp files
by forcing a manual garbage collection on the JVM, using `jcmd <pid> GC.run`. However,
that only worked once the job meta data had been removed from the archive, i.e. it doesn't
show up in the web interface anymore. With this fix, the class loader is cleared upon job
completion and the files are immediately removed. `lsof | fgrep blob_` didn't show any of
these files anymore.
    
    Note, that we don't perform any cleanup on the TaskManager side. There we also wind up
with some left over files but they don't seem to pile up. It must be that the garbage collector
can figure out when to clean much earlier. Plus, we don't keep a reference to old Task instances
like we do for the web interface on the JobManager side.
    
    @StephanEwen I'm thinking about adding a similar fix for the TaskManager side. What do
you think?


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