http://deprecated-apache-flink-mailing-list-archive.368.s1.nabble.com/jira-Closed-FLINK-729-HashReduce-based-on-java-util-hash-map-tp464.html
I think in my understanding this pull request needs some reworking before being in a merge-able state.
> HashReduce based on java-util-hash-map
> --------------------------------------
>
> Key: FLINK-729
> URL:
https://issues.apache.org/jira/browse/FLINK-729> Project: Flink
> Issue Type: Bug
> Reporter: GitHub Import
> Labels: github-import
> Fix For: pre-apache
>
> Attachments: pull-request-729-5872621547979291368.patch
>
>
> This is a first step for the hash-aggregator, corresponding issue:
https://github.com/stratosphere/stratosphere/issues/82> This implementation is a ReduceOperator based on a hash-table, instead of sorting the elements.
> It is just a prototype because it is still using the java-util-hash-map, and furthermore the CostEstimation is just 0 for now.
> This PR is based on the PR for dividing the reduce and group reduce operators(
https://github.com/stratosphere/stratosphere/pull/726), only commit bb5640a is the HashReduce code. I just opened the PR to get feedback on the current code and how I should proceed with a stratosphere-hash-map implementation and adjusting the CostEstimation.
> ---------------- Imported from GitHub ----------------
> Url:
https://github.com/stratosphere/stratosphere/pull/729> Created by: [filiphaase|
https://github.com/filiphaase]
> Labels:
> Created at: Mon Apr 28 12:23:25 CEST 2014
> State: open