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https://issues.apache.org/jira/browse/HADOOP-4635?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12649710#action_12649710
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Marc-Olivier Fleury commented on HADOOP-4635:
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I tried to get back to version 0.18.3, and it corrected the leak. I don't have
time to evaluate more precisely what caused the leak, but I can still provide
these details:
I am now using fuse_dfs without permissions (-Dlibhdfs.noperms=1). It was
actually needed to compile with 0.18.3.
So, the leak I was experiencing may come from the getGroups stuff. However,
considering that you also use the latest version of fuse-dfs, and do not
experience any leak, the problem ,might also very well come from libhdfs, and
not from fuse-dfs.
I hope that my feedback may be of some use someday...
Thanks for your help.
> Memory leak ?
> -------------
>
> Key: HADOOP-4635
> URL: https://issues.apache.org/jira/browse/HADOOP-4635
> Project: Hadoop Core
> Issue Type: Bug
> Components: contrib/fuse-dfs
> Affects Versions: 0.19.0, 0.20.0
> Reporter: Marc-Olivier Fleury
>
> I am running a process that needs to crawl a tree structure containing ~10K
> images, copy the images to the local disk, process these images, and copy
> them back to HDFS.
> My problem is the following : after about 10h of processing, the processes
> crash, complaining about a std::bad_alloc exception (I use hadoop pipes to
> run existing software). When running fuse_dfs in debug mode, I get an
> outOfMemoryError, telling that there is no more room in the heap.
> While the process is running, using top or ps, I notice that fuse is using up
> an increasing amount of memory, until some limit is reached. At that point ,
> the memory used is oscillating. I suppose that this is due to the use of the
> virtual memory.
> This leads me to the conclusion that there is some memory leak in fuse_dfs,
> since the only other programs running are Hadoop and the existing software,
> both thoroughly tested in the past.
> My problem is that my knowledge concerning memory leak tracking is rather
> limited, so I will need some instructions to get more insight concerning this
> issue.
> Thank you
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