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From "Lefty Leverenz (JIRA)" <>
Subject [jira] [Commented] (HIVE-7685) Parquet memory manager
Date Tue, 06 Jan 2015 05:59:35 GMT


Lefty Leverenz commented on HIVE-7685:

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

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

> Parquet memory manager
> ----------------------
>                 Key: HIVE-7685
>                 URL:
>             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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