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From Jacek Laskowski <>
Subject Re: Change parallelism number in Spark Streaming
Date Wed, 26 Jun 2019 17:59:08 GMT

It's not allowed to change the numer of partitions after your streaming
query is started.

The reason is exactly the number of state stores which is exactly the
number of partitions (perhaps multiplied by the number of stateful

I think you'll even get a warning or an exception when you change it after
restarting the query.

The number of partitions is stored in a checkpoint location.


On Wed, 26 Jun 2019, 19:30 Rong, Jialei, <> wrote:

> Hi Dear Spark Expert
> I’m curious about a question regarding Spark Streaming/Structured
> Streaming: whether it allows to change parallelism number(the default one
> or the one specified in particular operator) in a stream having stateful
> transform/operator? Whether this will cause my checkpointed state get
> messed up?
> Regards
> Jialei

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