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https://issues.apache.org/jira/browse/STORM-105?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Rick Kellogg updated STORM-105:
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Component/s: storm-multilang
> storm.py should turn off sysout to avoid python code interfering with data
> exchange
> -----------------------------------------------------------------------------------
>
> Key: STORM-105
> URL: https://issues.apache.org/jira/browse/STORM-105
> Project: Apache Storm
> Issue Type: Improvement
> Components: storm-multilang
> Reporter: James Xu
> Priority: Minor
>
> https://github.com/nathanmarz/storm/issues/351
> I ran across this issue because I was trying to wrap an existing python
> script as a bolt and it had prints in it. This will mess up the tuple emits
> from the python bolt. I recommend that you add some code like this to the
> storm.py script to avoid the problem...
> #turn off stdout to avoid messing with JSON payload sent back to JAVA
> layer
> original_stdout = sys.stdout # keep a reference to STDOUT
> sys.stdout = NullDevice()
> try:
> //callout to bolt process method
> finally:
> sys.stdout = original_stdout; # turn back on to allow emit to work
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