[jira] [Commented] (SPARK-21192) Preserve State Store provider class configuration across StreamingQuery restarts

["Apache Spark (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-21192?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16060699#comment-16060699 ] 

Apache Spark commented on SPARK-21192:
--------------------------------------

User 'tdas' has created a pull request for this issue:
https://github.com/apache/spark/pull/18402

> Preserve State Store provider class configuration across StreamingQuery restarts
> --------------------------------------------------------------------------------
>
>                 Key: SPARK-21192
>                 URL: https://issues.apache.org/jira/browse/SPARK-21192
>             Project: Spark
>          Issue Type: Improvement
>          Components: Structured Streaming
>    Affects Versions: 2.3.0
>            Reporter: Tathagata Das
>            Assignee: Tathagata Das
>
> If the SQL conf for StateStore provider class is changed between restarts (i.e. query started with providerClass1 and attempted to restart using providerClass2), then the query will fail in a unpredictable way as files saved by one provider class cannot be used by the newer one. 
> Ideally, the provider class used to start the query should be used to restart the query, and the configuration in the session where it is being restarted should be ignored. 



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