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[SPARK-11335][STREAMING] update kafka direct python docs on how to get the offset ranges for a KafkaRDD #9289

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[SPARK-11335][STREAMING] update kafka direct python docs on how to get the offset ranges for a KafkaRDD #9289

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update kafka direct python docs on how to get the offset ranges for a…
ontarionick Oct 27, 2015
85e4b25
use global variable instead of emptying then extending list
ontarionick Oct 27, 2015
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15 changes: 14 additions & 1 deletion docs/streaming-kafka-integration.md
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Expand Up @@ -181,7 +181,20 @@ Next, we discuss how to use this approach in your streaming application.
);
</div>
<div data-lang="python" markdown="1">
Not supported yet
offsetRanges = []

def storeOffsetRanges(rdd):
del offsetRanges[:]
offsetRanges.extend(rdd.offsetRanges())
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@tdas tdas Oct 27, 2015

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cant we simply use offsetRanges = rdd.offsetRanges()?

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@ontarionick ontarionick Oct 27, 2015

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I tried that and couldn't get it working - seems to be related to a new object being created instead of updating the old one.

However, if I add global offsetRanges before, that seems to work fine. I'll push that change out.

return rdd

def printOffsetRanges(rdd):
for o in offsetRanges:
print "%s %s %s %s" % (o.topic, o.partition, o.fromOffset, o.untilOffset)

directKafkaStream\
.transform(storeOffsetRanges)\
.foreachRDD(printOffsetRanges)
</div>
</div>

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