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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-2237) Add hash-based Aggregation
Date Wed, 10 Feb 2016 15:25:18 GMT

    [ https://issues.apache.org/jira/browse/FLINK-2237?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15140982#comment-15140982
] 

ASF GitHub Bot commented on FLINK-2237:
---------------------------------------

Github user fhueske commented on a diff in the pull request:

    https://github.com/apache/flink/pull/1517#discussion_r52471392
  
    --- Diff: flink-tests/src/test/java/org/apache/flink/test/manual/ReducePerformance.java
---
    @@ -0,0 +1,191 @@
    +/*
    + * Licensed to the Apache Software Foundation (ASF) under one
    + * or more contributor license agreements.  See the NOTICE file
    + * distributed with this work for additional information
    + * regarding copyright ownership.  The ASF licenses this file
    + * to you under the Apache License, Version 2.0 (the
    + * "License"); you may not use this file except in compliance
    + * with the License.  You may obtain a copy of the License at
    + *
    + *     http://www.apache.org/licenses/LICENSE-2.0
    + *
    + * Unless required by applicable law or agreed to in writing, software
    + * distributed under the License is distributed on an "AS IS" BASIS,
    + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    + * See the License for the specific language governing permissions and
    + * limitations under the License.
    + */
    +
    +package org.apache.flink.test.manual;
    +
    +import org.apache.flink.api.common.functions.ReduceFunction;
    +import org.apache.flink.api.common.operators.base.ReduceOperatorBase;
    +import org.apache.flink.api.java.DataSet;
    +import org.apache.flink.api.java.ExecutionEnvironment;
    +import org.apache.flink.api.java.tuple.Tuple2;
    +import org.apache.flink.api.java.typeutils.TupleTypeInfo;
    +import org.apache.flink.util.SplittableIterator;
    +
    +import java.io.Serializable;
    +import java.util.Iterator;
    +import java.util.Random;
    +
    +public class ReducePerformance {
    --- End diff --
    
    How about something like `HashCombinedReduceBenchmark`?


> Add hash-based Aggregation
> --------------------------
>
>                 Key: FLINK-2237
>                 URL: https://issues.apache.org/jira/browse/FLINK-2237
>             Project: Flink
>          Issue Type: New Feature
>            Reporter: Rafiullah Momand
>            Assignee: Gabor Gevay
>            Priority: Minor
>
> Aggregation functions at the moment are implemented in a sort-based way.
> How can we implement hash based Aggregation for Flink?



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