Github user mxm commented on the issue:
    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>`. 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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