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From "Lefty Leverenz (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-7685) Parquet memory manager
Date Wed, 07 Jan 2015 09:07:35 GMT

     [ https://issues.apache.org/jira/browse/HIVE-7685?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Lefty Leverenz updated HIVE-7685:
---------------------------------
    Labels: TODOC15  (was: )

> 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
>              Labels: TODOC15
>             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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