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From "Shixiong Zhu (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (SPARK-22187) Update unsaferow format for saved state such that we can set timeouts when state is null
Date Fri, 08 Dec 2017 06:05:00 GMT

     [ https://issues.apache.org/jira/browse/SPARK-22187?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Shixiong Zhu updated SPARK-22187:
---------------------------------
    Target Version/s:   (was: 2.3.0)

> Update unsaferow format for saved state such that we can set timeouts when state is null
> ----------------------------------------------------------------------------------------
>
>                 Key: SPARK-22187
>                 URL: https://issues.apache.org/jira/browse/SPARK-22187
>             Project: Spark
>          Issue Type: Sub-task
>          Components: Structured Streaming
>    Affects Versions: 2.2.0
>            Reporter: Tathagata Das
>            Assignee: Tathagata Das
>              Labels: release-notes, releasenotes
>
> Currently the group state of user-defined-type is encoded as top-level columns in the
unsaferows stores in state store. The timeout timestamp is also saved as (when needed) as
the last top-level column. Since, the groupState is serialized to top level columns, you cannot
save "null" as a value of state (setting null in all the top-level columns is not equivalent).
So we dont let the user to set the timeout without initializing the state for a key. Based
on user experience, his leads to confusion. 
> This JIRA is to change the row format such that the state is saved as nested columns.
This would allow the state to be set to null, and avoid these confusing corner cases.



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