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Posted to common-dev@hadoop.apache.org by "dingyichuan (JIRA)" <ji...@apache.org> on 2013/01/07 16:04:12 UTC

[jira] [Created] (HADOOP-9182) the buffer used in hdfsRead seems leaks when the thread exits

dingyichuan created HADOOP-9182:
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             Summary: 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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