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From "Mendelson, Assaf" <>
Subject RE: How to use ManualClock with Spark streaming
Date Wed, 05 Apr 2017 18:36:28 GMT
You can try taking a look at this:


From: Hemalatha A []
Sent: Wednesday, April 05, 2017 1:59 PM
To: Saisai Shao;
Subject: Re: How to use ManualClock with Spark streaming

Any updates on how can I use ManualClock other than editing the Spark source code?

On Wed, Mar 1, 2017 at 10:19 AM, Hemalatha A <<>>
It is certainly possible through a hack.
I was referring to below post where TD says it is possible thru a hack. I wanted to know if
there is  any way other than editing the Spark source code.!searchin/spark-users/manualclock%7Csort:relevance/spark-users/ES8X1l_xn5s/6PvGGRDfgnMJ

On Wed, Mar 1, 2017 at 7:09 AM, Saisai Shao <<>>
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 <<>>


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.





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