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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (APEXMALHAR-2106) Support merging multiple streams with StreamMerger
Date Tue, 21 Jun 2016 10:02:57 GMT

    [ https://issues.apache.org/jira/browse/APEXMALHAR-2106?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15341482#comment-15341482
] 

ASF GitHub Bot commented on APEXMALHAR-2106:
--------------------------------------------

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

    https://github.com/apache/apex-malhar/pull/309#discussion_r67840942
  
    --- Diff: library/src/main/java/com/datatorrent/lib/stream/MultipleStreamMerger.java ---
    @@ -0,0 +1,215 @@
    +/**
    + * 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 com.datatorrent.lib.stream;
    +
    +import java.util.ArrayList;
    +import java.util.Queue;
    +
    +import org.eclipse.jetty.util.ArrayQueue;
    +
    +import org.apache.hadoop.conf.Configuration;
    +
    +import com.datatorrent.api.DAG;
    +import com.datatorrent.api.DefaultInputPort;
    +import com.datatorrent.api.DefaultOutputPort;
    +
    +/**
    + * A helper class  that adds functionality to bypass the platform limitations of combining
more than two
    --- End diff --
    
    Not really the limitation of the platform. May be limitation of the existing StreamMerger?


> Support merging multiple streams with StreamMerger 
> ---------------------------------------------------
>
>                 Key: APEXMALHAR-2106
>                 URL: https://issues.apache.org/jira/browse/APEXMALHAR-2106
>             Project: Apache Apex Malhar
>          Issue Type: New Feature
>            Reporter: Ilya Ganelin
>            Assignee: Ilya Ganelin
>
> To properly implement the Flatten transformation (and other Stream combination operations),
Apex must support merging data from multiple sources. The StreamMerger operator can be improved
to merge multiple streams, rather than just the two streams it can handle in the present implementation.




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