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From "Hyukjin Kwon (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SPARK-26828) Coalesce to reduce partitions before writing to hive is not working
Date Thu, 07 Feb 2019 07:30:00 GMT

    [ https://issues.apache.org/jira/browse/SPARK-26828?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16762436#comment-16762436
] 

Hyukjin Kwon commented on SPARK-26828:
--------------------------------------

Can you make a self-reproducer so that people can deduplicate the efforts to investigate this?
Also, I wonder if {{spark.default.parallelism}} and {{spark.sql.shuffle.partitions}} matter.

> Coalesce to reduce partitions before writing to hive is not working
> -------------------------------------------------------------------
>
>                 Key: SPARK-26828
>                 URL: https://issues.apache.org/jira/browse/SPARK-26828
>             Project: Spark
>          Issue Type: Bug
>          Components: Spark Core
>    Affects Versions: 2.3.0
>            Reporter: Anusha Buchireddygari
>            Priority: Minor
>
> final_store.coalesce(5).write.mode("overwrite").insertInto("database.tablename",overwrite
= True), this statement is not merging partitions. I've set 
> .config("spark.default.parallelism", "2000") \
> .config("spark.sql.shuffle.partitions", "2000") \
> however repartition is working but takes 20-25 minutes to insert.



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