[jira] [Commented] (HIVE-7685) Parquet memory manager

["Lefty Leverenz (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HIVE-7685?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14265725#comment-14265725 ] 

Lefty Leverenz commented on HIVE-7685:
--------------------------------------

Doc note:  This adds *parquet.memory.pool.ratio* to HiveConf.java.

bq.  This config parameter is defined in Parquet, so that it does not start with 'hive.'

But should it be documented in Hive's wiki even though it's a Parquet parameter, since it's in HiveConf.java?

> Parquet memory manager
> ----------------------
>
>                 Key: HIVE-7685
>                 URL: https://issues.apache.org/jira/browse/HIVE-7685
>             Project: Hive
>          Issue Type: Improvement
>          Components: Serializers/Deserializers
>            Reporter: Brock Noland
>            Assignee: Dong Chen
>             Fix For: 0.15.0
>
>         Attachments: HIVE-7685.1.patch, HIVE-7685.1.patch.ready, HIVE-7685.patch, HIVE-7685.patch.ready
>
>
> Similar to HIVE-4248, Parquet tries to write large very large "row groups". This causes Hive to run out of memory during dynamic partitions when a reducer may have many Parquet files open at a given time.
> As such, we should implement a memory manager which ensures that we don't run out of memory due to writing too many row groups within a single JVM.



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