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Posted to common-issues@hadoop.apache.org by "Todd Lipcon (JIRA)" <ji...@apache.org> on 2013/01/07 19:24:13 UTC
[jira] [Commented] (HADOOP-9182) the buffer used in hdfsRead seems
leaks when the thread exits
[ https://issues.apache.org/jira/browse/HADOOP-9182?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13546119#comment-13546119 ]
Todd Lipcon commented on HADOOP-9182:
-------------------------------------
We don't do anything thread-local that could cause this. My guess is you're forgetting to close your files. If you can show a simple standalone reproducing program, we can take a look. Otherwise I'm inclined to mark "cannot reproduce"
> the buffer used in hdfsRead seems leaks when the thread exits
> -------------------------------------------------------------
>
> Key: HADOOP-9182
> URL: https://issues.apache.org/jira/browse/HADOOP-9182
> Project: Hadoop Common
> Issue Type: Bug
> Components: filecache
> Environment: Linux RHEP x64
> Reporter: dingyichuan
>
> I use multi-threads in my c++ program to download 3000 files in HDFS use libhdfs. Every thread is created by "pthread_create" to download a file and exit. We monitor the memory status when the program is running. It seems every thread will create a buffer which size is specified by the buffersize parameter in "hdfsOpenFile" function. But when the thread finish the task and exit, it doesn't free the buffer. So our program will eventually abort by Java's "out of memory" exception. I just don't know how to free the buffer or I use these functions in wrong way. Thanks!
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