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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (APEXMALHAR-1701) Deduper : create a deduper backed by Managed State
Date Wed, 13 Jul 2016 08:56:20 GMT

    [ https://issues.apache.org/jira/browse/APEXMALHAR-1701?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15374625#comment-15374625
] 

ASF GitHub Bot commented on APEXMALHAR-1701:
--------------------------------------------

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

    https://github.com/apache/apex-malhar/pull/335#discussion_r70587702
  
    --- Diff: library/src/main/java/org/apache/apex/malhar/lib/dedup/AbstractDeduper.java
---
    @@ -0,0 +1,463 @@
    +/**
    + * 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.dedup;
    +
    +import java.util.Iterator;
    +import java.util.Map;
    +import java.util.Map.Entry;
    +import java.util.concurrent.ExecutionException;
    +import java.util.concurrent.Future;
    +
    +import javax.validation.constraints.NotNull;
    +
    +import org.slf4j.Logger;
    +import org.slf4j.LoggerFactory;
    +
    +import org.apache.apex.malhar.lib.state.BucketedState;
    +import org.apache.apex.malhar.lib.state.managed.ManagedTimeUnifiedStateImpl;
    +import org.apache.apex.malhar.lib.state.managed.TimeBucketAssigner;
    +import org.apache.hadoop.classification.InterfaceStability.Evolving;
    +
    +import com.google.common.base.Preconditions;
    +import com.google.common.collect.Maps;
    +import com.google.common.util.concurrent.Futures;
    +
    +import com.datatorrent.api.AutoMetric;
    +import com.datatorrent.api.Context;
    +import com.datatorrent.api.Context.OperatorContext;
    +import com.datatorrent.api.DAG;
    +import com.datatorrent.api.DefaultInputPort;
    +import com.datatorrent.api.DefaultOutputPort;
    +import com.datatorrent.api.Operator;
    +import com.datatorrent.api.Operator.ActivationListener;
    +import com.datatorrent.api.annotation.OperatorAnnotation;
    +import com.datatorrent.api.annotation.OutputPortFieldAnnotation;
    +import com.datatorrent.lib.fileaccess.FileAccessFSImpl;
    +import com.datatorrent.lib.fileaccess.TFileImpl;
    +import com.datatorrent.netlet.util.Slice;
    +
    +/**
    + * Abstract class which allows de-duplicating incoming tuples based on a configured key.
    + * Also supports expiry mechanism based on a configurable expiry period configured using
{@link TimeBucketAssigner}
    + * in {@link ManagedTimeUnifiedStateImpl}
    + *
    + * @param <T> type of events
    + */
    +@Evolving
    +@OperatorAnnotation(checkpointableWithinAppWindow = false)
    +public abstract class AbstractDeduper<T>
    +    implements Operator, Operator.IdleTimeHandler, ActivationListener<Context>,
Operator.CheckpointNotificationListener
    +{
    +  /**
    +   * The input port on which events are received.
    +   */
    +  public final transient DefaultInputPort<T> input = new DefaultInputPort<T>()
    +  {
    +    @Override
    +    public final void process(T tuple)
    +    {
    +      processTuple(tuple);
    +    }
    +  };
    +
    +  /**
    +   * The output port on which deduped events are emitted.
    +   */
    +  public final transient DefaultOutputPort<T> output = new DefaultOutputPort<T>();
    +
    +  /**
    +   * The output port on which duplicate events are emitted.
    +   */
    +  @OutputPortFieldAnnotation(optional = true)
    +  public final transient DefaultOutputPort<T> duplicates = new DefaultOutputPort<T>();
    +
    +  /**
    +   * The output port on which expired events are emitted.
    +   */
    +  @OutputPortFieldAnnotation(optional = true)
    +  public final transient DefaultOutputPort<T> expired = new DefaultOutputPort<T>();
    +
    +  /**
    +   * Whether or not the order of tuples be maintained
    +   */
    +  protected boolean orderedOutput = false;
    +
    +  @NotNull
    +  protected final ManagedTimeUnifiedStateImpl managedState = new ManagedTimeUnifiedStateImpl();
    +
    +  /**
    +   * Map to hold the result of a tuple processing (unique, duplicate, expired or error)
until previous
    +   * tuples get processed. This is used only when {@link #orderedOutput} is true.
    +   */
    +  protected transient Map<T, Decision> decisions;
    +  private transient long sleepMillis;
    +  private transient Map<T, Future<Slice>> waitingEvents = Maps.newLinkedHashMap();
    +  private transient Map<Slice, Long> asyncEvents = Maps.newLinkedHashMap();
    +
    +  // Metrics
    +  @AutoMetric
    +  protected transient long uniqueEvents;
    --- End diff --
    
    uniqueEvents, duplicateEvents, expiredEvents doesn't seem to be used in subclass.. Can
you make them private? Also please check if there are any other such variables which do not
need access outside of this java file.


> Deduper : create a deduper backed by Managed State
> --------------------------------------------------
>
>                 Key: APEXMALHAR-1701
>                 URL: https://issues.apache.org/jira/browse/APEXMALHAR-1701
>             Project: Apache Apex Malhar
>          Issue Type: Task
>          Components: algorithms
>            Reporter: Chandni Singh
>            Assignee: Chandni Singh
>
> Need a de-deduplicator operator that is based on Managed State.



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