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From "dingyichuan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-9182) the buffer used in hdfsRead seems leaks when the thread exits
Date Mon, 14 Jan 2013 11:08:13 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-9182?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13552578#comment-13552578

dingyichuan commented on HADOOP-9182:

Hi, Colin Patrick McCabe 
Actually, I have no idea of the version info. Our team began to use the lib several years
ago and have patched to the lib many times. I am new to this group, so... sorry :P
> 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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