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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (APEXMALHAR-2085) Implement Windowed Operators
Date Fri, 24 Jun 2016 19:31:51 GMT

    [ https://issues.apache.org/jira/browse/APEXMALHAR-2085?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15348582#comment-15348582
] 

ASF GitHub Bot commented on APEXMALHAR-2085:
--------------------------------------------

Github user davidyan74 commented on a diff in the pull request:

    https://github.com/apache/apex-malhar/pull/319#discussion_r68450198
  
    --- Diff: library/src/main/java/org/apache/apex/malhar/lib/window/impl/KeyedWindowedOperatorImpl.java
---
    @@ -0,0 +1,159 @@
    +/**
    + * 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.apex.malhar.lib.window.impl;
    +
    +import java.util.Collection;
    +import java.util.List;
    +import java.util.Map;
    +
    +import org.apache.apex.malhar.lib.window.Accumulation;
    +import org.apache.apex.malhar.lib.window.SessionWindowedStorage;
    +import org.apache.apex.malhar.lib.window.TriggerOption;
    +import org.apache.apex.malhar.lib.window.Tuple;
    +import org.apache.apex.malhar.lib.window.Window;
    +import org.apache.apex.malhar.lib.window.WindowOption;
    +import org.apache.apex.malhar.lib.window.WindowState;
    +import org.apache.apex.malhar.lib.window.WindowedKeyedStorage;
    +
    +import com.datatorrent.lib.util.KeyValPair;
    +
    +/**
    + * This is an implementation of WindowedOperator that takes in key value pairs as input
and gives out key value pairs
    + * as output. If your operation is not key based, please use {@link WindowedOperatorImpl}.
    + */
    +public class KeyedWindowedOperatorImpl<KeyT, InputValT, AccumT, OutputValT>
    --- End diff --
    
    done


> Implement Windowed Operators
> ----------------------------
>
>                 Key: APEXMALHAR-2085
>                 URL: https://issues.apache.org/jira/browse/APEXMALHAR-2085
>             Project: Apache Apex Malhar
>          Issue Type: New Feature
>            Reporter: Siyuan Hua
>            Assignee: David Yan
>
> As per our recent several discussions in the community. A group of Windowed Operators
that delivers the window semantic follows the google Data Flow model(https://cloud.google.com/dataflow/)
is very important. 
> The operators should be designed and implemented in a way for 
> High-level API
> Beam translation
> Easy to use with other popular operator
> {panel:title=Operator Hierarchy}
> Hierarchy of the operators,
> The windowed operators should cover all possible transformations that require window,
and batch processing is also considered as special window called global window
> {code}
>                    +-------------------+
>        +---------> |  WindowedOperator | <--------+
>        |           +--------+----------+          |
>        |                    ^      ^--------------------------------+
>        |                    |                     |                 |
>        |                    |                     |                 |
> +------+--------+    +------+------+      +-------+-----+    +------+-----+
> |CombineOperator|    |GroupOperator|      |KeyedOperator|    |JoinOperator|
> +---------------+    +-------------+      +------+------+    +-----+------+
>                                    +---------^   ^                 ^
>                                    |             |                 |
>                           +--------+---+   +-----+----+       +----+----+
>                           |KeyedCombine|   |KeyedGroup|       | CoGroup |
>                           +------------+   +----------+       +---------+
> {code}
> Combine operation includes all operations that combine all tuples in one window into
one or small number of tuples, Group operation group all tuples in one window, Join and CoGroup
are used to join and group tuples from different inputs.
> {panel}
> {panel:title=Components}
> * Window Component
> It includes configuration, window state that should be checkpointed, etc. It should support
NonMergibleWindow(fixed or slide) MergibleWindow(Session)
> * Trigger
> It should support early trigger, late trigger with customizable trigger behaviour 
> * Other related components:
> ** Watermark generator, can be plugged into input source to generate watermark
> ** Tuple schema support:
> It should handle either predefined tuple type or give a declarative API to describe the
user defined tuple class
> {panel}
> Most component API should be reused in High-Level API
> This is the umbrella ticket, separate tickets would be created for different components
and operators respectively 



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