[jira] [Commented] (STORM-351) multilang python process fall into endless loop

["ASF GitHub Bot (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/STORM-351?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14952630#comment-14952630 ] 

ASF GitHub Bot commented on STORM-351:
--------------------------------------

Github user mazhechao commented on the pull request:

    https://github.com/apache/storm/pull/140#issuecomment-147291501
  
    Can this leads to memory leak?


> multilang python process fall into endless loop
> -----------------------------------------------
>
>                 Key: STORM-351
>                 URL: https://issues.apache.org/jira/browse/STORM-351
>             Project: Apache Storm
>          Issue Type: Bug
>          Components: storm-multilang
>    Affects Versions: 0.9.3
>         Environment: storm 0.9.3-incubating
>            Reporter: DashengJu
>            Assignee: DashengJu
>            Priority: Blocker
>             Fix For: 0.9.3
>
>
> 1. steps to reproduce
>     1)  write a topology with a python bolt, run the topology on storm; then there will be two process for the bolt: the worker(java process for ShellBolt), python process.
>     2）kill -9  the worker(java process for ShellBolt);
> 2. expected behavior
>     the worker exit and the python process exist
> 3. actual, incorrect behavior
>     the worker exit, but the python process never exist and fall into endless loop
> 4. analyse
>     in storm.py，read tuple from stdin with follow function:
> def readMsg():
>     msg = ""
>     while True:
>         line = sys.stdin.readline()[0:-1]
>         if line == "end":
>             break
>         msg = msg + line + "\n"
>     return json_decode(msg[0:-1])
>     when sys.stdin is closed, EOF is encountered, readline() return None, so readMsg fall into endless loop.



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