Re: Flink SQL, How can i set parallelism in clause of group by ?

Posted by Benchao Li on
URL: http://deprecated-apache-flink-user-mailing-list-archive.369.s1.nabble.com/Flink-SQL-How-can-i-set-parallelism-in-clause-of-group-by-tp33736p33744.html

Hi forideal,

Currently, there is no way to change an operator's parallelism for SQL. All operators use global parallelism as their parallelism, except for some 'global operator' which can only has parallelism of 1.

BTW, does changing the parallelism of all operators meets your need?

forideal <[hidden email]> 于2020年3月18日周三 上午12:50写道：

Hello everyone

     I'm a Flink SQL user. Now i have a question.How can i set parallelism in clause of group by.

     For example

     SELECT 

            T.user_id,

            D.user_name

     (SELECT 

             user_id,

             MIN(processtime)

     from my_table 

    group by user_id,TUMBLE(processtime, INTERVAL '15' SECOND)) AS T

     LEFT JOIN my_dim_table FOR SYSTEM_TIME AS OF T.proc_time AS D ON T.user_id = D.user_id

     

     If the partition of the topic is 3, then,the parallelism of the job is 3.

     In this example,there are three operator

         0ne is Source operator, parallelism is 3

         Two is GroupWindowAggregate operator,parallelism is 3

         Three is LookupJoin operator,parallelism is 3

      I want to change the parallelism of GroupWindowAggregate,but i can't.

Best wishes

forideal

 

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