Thu, Jun 27, 2019 at 4:48 AM Rong, Jialei
>>>> wrote:
>>>>
>>>>> Thank you for your quick reply!
>>>>>
>>>>> Is there any plan to improve this?
>>>>>
>>>>> I asked this question due to some investigation
gt;>
>>>> I asked this question due to some investigation on comparing those
>>>> state of art streaming systems, among which Flink and DataFlow allow
>>>> changing parallelism number, and by my knowledge of Spark Streaming, it
>>>> seems it is also able to do that: if s
knowledge of Spark Streaming, it seems it is
>>> also able to do that: if some “key interval” concept is used, then state
>>> can somehow decoupled from partition number by consistent hashing.
>>>
>>>
>>>
>>>
>>>
>>> Regards
>&g
hashing.
>>
>>
>>
>>
>>
>> Regards
>>
>> Jialei
>>
>>
>>
>> *From: *Jacek Laskowski
>> *Date: *Wednesday, June 26, 2019 at 11:00 AM
>> *To: *"Rong, Jialei"
>> *Cc: *"user @spark"
>> *Su
, 2019 at 11:00 AM
> *To: *"Rong, Jialei"
> *Cc: *"user @spark"
> *Subject: *Re: Change parallelism number in Spark Streaming
>
>
>
> Hi,
>
>
>
> It's not allowed to change the numer of partitions after your streaming
> query is star
Fantastic, thanks!
From: Jungtaek Lim
Date: Wednesday, June 26, 2019 at 2:59 PM
To: "Rong, Jialei"
Cc: Jacek Laskowski , "user @spark"
Subject: Re: Change parallelism number in Spark Streaming
Hi,
you could consider state operator's partition numbers as "max
9 at 11:00 AM
> *To: *"Rong, Jialei"
> *Cc: *"user @spark"
> *Subject: *Re: Change parallelism number in Spark Streaming
>
>
>
> Hi,
>
>
>
> It's not allowed to change the numer of partitions after your streaming
> query is started.
&
to do
that: if some “key interval” concept is used, then state can somehow decoupled
from partition number by consistent hashing.
Regards
Jialei
From: Jacek Laskowski
Date: Wednesday, June 26, 2019 at 11:00 AM
To: "Rong, Jialei"
Cc: "user @spark"
Subject: Re: Change p
Hi,
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
operators).
I think you'll even get a warning or an exception whe
