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Posted to issues@flink.apache.org by "jackylau (Jira)" <ji...@apache.org> on 2019/09/30 03:11:00 UTC

[jira] [Commented] (FLINK-14243) flink hiveudf need some check when it is using cache

    [ https://issues.apache.org/jira/browse/FLINK-14243?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16940619#comment-16940619 ] 

jackylau commented on FLINK-14243:
----------------------------------

[~ykt836]  The original udf function uses cache, which you can see hive system udf like get_json_object.

> flink hiveudf need some check when it is using cache
> ----------------------------------------------------
>
>                 Key: FLINK-14243
>                 URL: https://issues.apache.org/jira/browse/FLINK-14243
>             Project: Flink
>          Issue Type: Bug
>          Components: Connectors / Hive, Table SQL / Planner
>    Affects Versions: 1.9.0
>            Reporter: jackylau
>            Priority: Major
>             Fix For: 1.10.0
>
>
> Flink1.9 bring in hive connector, but it will have some problem when the original hive udf using cache. We konw that hive is  processed level parallel based on jvm, while flink/spark is task level parallel. If flink just calls the hive udf, it wll exists thread-safe problem when using cache.
> So it may need check the hive udf code and if it is not thread-safe, and set the flink parallize=1



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