James Xu created STORM-105:
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Summary: 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 (Incubating)
Issue Type: Improvement
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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