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From "Jason Dere (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-19138) Results cache: allow queries waiting on pending cache entries to check cache again if pending query fails
Date Mon, 09 Apr 2018 21:55:00 GMT

    [ https://issues.apache.org/jira/browse/HIVE-19138?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16431356#comment-16431356
] 

Jason Dere commented on HIVE-19138:
-----------------------------------

RB at https://reviews.apache.org/r/66516/
[~gopalv] [~djaiswal] can you take a look?

> Results cache: allow queries waiting on pending cache entries to check cache again if
pending query fails
> ---------------------------------------------------------------------------------------------------------
>
>                 Key: HIVE-19138
>                 URL: https://issues.apache.org/jira/browse/HIVE-19138
>             Project: Hive
>          Issue Type: Sub-task
>            Reporter: Jason Dere
>            Assignee: Jason Dere
>            Priority: Major
>         Attachments: HIVE-19138.1.patch
>
>
> HIVE-18846 allows the results cache to refer to currently executing queries so that another
query can wait for these results to become ready in the results cache. If the pending query
fails then Hive will automatically skip the cache and do the full query compilation. Make
a fix here so that if the pending query fails, Hive will still try to check the cache again
in case the cache has another cached/pending result that can be used to answer the query.



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