[
https://issues.apache.org/jira/browse/PIG-1270?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Daniel Dai updated PIG-1270:
----------------------------
Attachment: PIG-1270-2.patch
PIG-1270-2.patch fix all unit tests. However, I didn't see noticeable
performance improvement. The script I test is:
a = load 'studenttab20m' as (name, age, gpa);
b = limit a 10;
dump b;
Both in local mode and mapreduce mode.
Need further investigation to find out why performance not improve.
> Push limit into loader
> ----------------------
>
> Key: PIG-1270
> URL: https://issues.apache.org/jira/browse/PIG-1270
> Project: Pig
> Issue Type: Bug
> Components: impl
> Affects Versions: 0.7.0
> Reporter: Daniel Dai
> Assignee: Daniel Dai
> Attachments: PIG-1270-1.patch, PIG-1270-2.patch
>
>
> We can optimize limit operation by stopping early in PigRecordReader. In
> general, we need a way to communicate between PigRecordReader and execution
> pipeline. POLimit could instruct PigRecordReader that we have already had
> enough records and stop feeding more data.
--
This message is automatically generated by JIRA.
For more information on JIRA, see: http://www.atlassian.com/software/jira
