You are viewing a plain text version of this content. The canonical link for it is here.
Posted to dev@crunch.apache.org by "Josh Wills (JIRA)" <ji...@apache.org> on 2013/08/07 05:52:47 UTC
[jira] [Resolved] (CRUNCH-247) Planner should take advantage of
to-be-materialized outputs during planning
[ https://issues.apache.org/jira/browse/CRUNCH-247?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Josh Wills resolved CRUNCH-247.
-------------------------------
Resolution: Fixed
Pushed to master.
> Planner should take advantage of to-be-materialized outputs during planning
> ---------------------------------------------------------------------------
>
> Key: CRUNCH-247
> URL: https://issues.apache.org/jira/browse/CRUNCH-247
> Project: Crunch
> Issue Type: Bug
> Components: Core
> Reporter: Josh Wills
> Assignee: Josh Wills
> Fix For: 0.8.0
>
> Attachments: CRUNCH-247.patch
>
>
> In the following pipeline, the Crunch planner will rerun the "op1" step in two independent map-only jobs, instead of running a single job that executes the op1 step followed by a subsequent job that consumes that output and runs the op2 step:
> PCollection<String> in = p.read(From.textFile(inputPath));
> PTable<String, String> op = in.parallelDo("op1", new DoFn<String, Pair<String, String>>() {
> @Override
> public void process(String input, Emitter<Pair<String, String>> emitter) {
> if (input.length() > 5) {
> emitter.emit(Pair.of(input.substring(0, 3), input));
> }
> }
> }, tableOf(strings(), strings()));
>
> SourceTarget src = (SourceTarget)((MaterializableIterable<Pair<String, String>>) op.materialize()).getSource();
>
> op = op.parallelDo("op2", IdentityFn.<Pair<String,String>>getInstance(), tableOf(strings(), strings()),
> ParallelDoOptions.builder().sourceTargets(src).build());
>
> PCollection<String> output = op.values();
> output.write(To.textFile(out));
> The planner should be able to take advantage of the materialized output from op1 to not re-run that step in the op2 job.
--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators
For more information on JIRA, see: http://www.atlassian.com/software/jira