hive-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Brock Noland (JIRA)" <>
Subject [jira] [Commented] (HIVE-7685) Parquet memory manager
Date Tue, 06 Jan 2015 19:46:35 GMT


Brock Noland commented on HIVE-7685:

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

Yes, this was implemented specifically for Hive users who cannot easily control the number
of partitions being written so I think it makes sense to doc in the hive-parquet docs...

> 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.

This message was sent by Atlassian JIRA

View raw message