[jira] [Resolved] (SPARK-21370) Avoid doing anything on HDFSBackedStateStore.abort() when there are no updates to commit

["Tathagata Das (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-21370?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Tathagata Das resolved SPARK-21370.
-----------------------------------
       Resolution: Fixed
    Fix Version/s: 2.3.0

Issue resolved by pull request 18603
[https://github.com/apache/spark/pull/18603]

> Avoid doing anything on HDFSBackedStateStore.abort() when there are no updates to commit
> ----------------------------------------------------------------------------------------
>
>                 Key: SPARK-21370
>                 URL: https://issues.apache.org/jira/browse/SPARK-21370
>             Project: Spark
>          Issue Type: Test
>          Components: Structured Streaming
>    Affects Versions: 2.1.1
>            Reporter: Burak Yavuz
>            Assignee: Burak Yavuz
>            Priority: Minor
>             Fix For: 2.3.0
>
>
> During Streaming Aggregation, we have two StateStores per task, one used as read-only in StateStoreRestoreExec, and one read-write used in `StateStoreSaveExec`. `StateStore.abort` will be called for these StateStores if they haven't committed their results. We need to make sure that abort in read-only store after a commit in the read-write store doesn't
> accidentally lead to the deletion of state.
> This JIRA proposes a test for this case. StateStore implementations should successfully handle this use case.



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