When is called the nextTuple method of a Spout?

[Denis DEBARBIEUX <dd...@norsys.fr>]

Dear all,

I am using storm via the trident interface. I have few questions about 
the nextTuple method of a Spout

1. When is-it call? How many tuples per call should I emit? Only one? As 
much as possible? According to the doc, when there is no tuple to emit, 
the nextTuple method should call Thread.sleep(). Right?

2. My spout is listenning for some values  that are published in a 
channel (more or less twitter stream as done in twitter4J).  How many 
instances of my spout will be created? If there is more than one 
instance, how to avoid to emit many time the same value.

Thanks for your help.

Denis

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