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Date: Tue, 18 Nov 2008 14:23:44 -0800 (PST)
From: "Marc-Olivier Fleury (JIRA)" <jira@apache.org>
To: core-dev@hadoop.apache.org
Subject: [jira] Commented: (HADOOP-4635) Memory leak ?
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    [ https://issues.apache.org/jira/browse/HADOOP-4635?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12648783#action_12648783 ] 

Marc-Olivier Fleury commented on HADOOP-4635:
---------------------------------------------

I am using the latest patch provided in issue HADOOP-4616, which is supposed to fix the leaks, and I have bad news: there are still leaks.

while searching through the code, I noticed taht some of the functions used as fuse_operations are not static. Can it be a problem?

At least, fixing this does not remove the leak. I am running a version using static functions, the leak is still there.

I am running out of clues, so any help would be appreciated.

Thanks!

> 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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