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Posted to issues@flink.apache.org by "jackylau (Jira)" <ji...@apache.org> on 2019/09/30 03:57:00 UTC
[jira] [Comment Edited] (FLINK-14243) flink hiveudf needs 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=16940639#comment-16940639 ]
jackylau edited comment on FLINK-14243 at 9/30/19 3:56 AM:
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[~ykt836] This problem I consulted spark community before in wechat spark group. And it is the same problem in spark because you don't konw whether the UDF use a not thread-safe function. Someone said that they solved this by checking code but it would be complicated.
was (Author: jackylau):
This problem I consulted spark community before in wechat spark group. And it is the same problem in spark because you don't konw whether the UDF use a not thread-safe function. Someone said that they solved this by checking code but it would be complicated.
> flink hiveudf needs 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 brings 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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