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From Saisai Shao <>
Subject Re: How to use ManualClock with Spark streaming
Date Wed, 01 Mar 2017 01:39:58 GMT
I don't think using ManualClock is a right way to fix your problem here in
Spark Streaming.

ManualClock in Spark is mainly used for unit test, it should manually
advance the time to make the unit test work. The usage looks different
compared to the scenario you mentioned.


On Tue, Feb 28, 2017 at 10:53 PM, Hemalatha A <> wrote:

> Hi,
> I am running streaming application reading data from kafka and performing
> window operations on it. I have a usecase where  all incoming events have a
> fixed latency of 10s, which means data belonging to minute 10:00:00 will
> arrive 10s late at 10:00:10.
> I want to set the spark clock to "Manualclock" and set the time behind by
> 10s so that the batch calculation triggers at 10:00:10, during which time
> all the events for the previous minute has arrived.
> But, I see that "spark.streaming.clock" is hardcoded to "
> org.apache.spark.util.SystemClock" in the code.
> Is there a way to easily  hack this property to use Manual clock.
> --
> Regards
> Hemalatha

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