[
https://issues.apache.org/jira/browse/HIVE-5834?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Gopal V updated HIVE-5834:
--------------------------
Fix Version/s: tez-branch
Labels: perfomance split (was: )
Affects Version/s: (was: 0.13.0)
tez-branch
Release Note: Avoid reading ORC footers for files where data and
footer are in the same HDFS block
Status: Patch Available (was: Open)
> Avoid reading ORC footers for files which will not be split in
> OrcInputFormat::getSplits()
> ------------------------------------------------------------------------------------------
>
> Key: HIVE-5834
> URL: https://issues.apache.org/jira/browse/HIVE-5834
> Project: Hive
> Issue Type: Improvement
> Components: Tez
> Affects Versions: tez-branch
> Reporter: Gopal V
> Assignee: Gopal V
> Labels: perfomance, split
> Fix For: tez-branch
>
> Attachments: HIVE-5834.00-tez.patch
>
>
> OrcInputFormat::getSplits() fires off a SplitGenerator task for every file in
> the task.
> The footer & data are on the same node for all files with only 1 hdfs block.
> On top of that, it will never need a further split as long as its total size
> is < context.maxSize.
> Reading that footer locally is faster than reading it in the split gen and
> sending it from the AM.
--
This message was sent by Atlassian JIRA
(v6.1#6144)
