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https://issues.apache.org/jira/browse/PIG-627?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12665657#action_12665657
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Olga Natkovich commented on PIG-627:
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The proposal is as follows:
(1) No changes in interactive mode. Each store or dump starts a job.
Interactive mode is not about efficiency but about ease of use
(2) In batch mode, a connected set of stores/dumps is executed together.
Processing continues on Failures: after the run you can get response that some
of the queries in the batch succeeded and some failed. (We need to figure out
how to communicate this information to the users. Done files is one of the
options.)
The nice feature of this approach is that it requires no changes on the part of
the user. After the change is implemented, some queries will just run faster.
> PERFORMANCE: multi-query optimization
> -------------------------------------
>
> Key: PIG-627
> URL: https://issues.apache.org/jira/browse/PIG-627
> Project: Pig
> Issue Type: Improvement
> Affects Versions: types_branch
> Reporter: Olga Natkovich
> Fix For: types_branch
>
>
> Currently, if your Pig script contains multiple stores and some shared
> computation, Pig will execute several independent queries. For instance:
> A = load 'data' as (a, b, c);
> B = filter A by a > 5;
> store B into 'output1';
> C = group B by b;
> store C into 'output2';
> This script will result in map-only job that generated output1 followed by a
> map-reduce job that generated output2. As the resuld data is read, parsed and
> filetered twice which is unnecessary and costly.
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