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From: jackylk <git@git.apache.org>
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Subject: [GitHub] carbondata pull request #1179: [CARBONDATA-1364] Added the blocklet info to ...
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Message-Id: <20170807164521.C1F10E96C0@git1-us-west.apache.org>
Date: Mon,  7 Aug 2017 16:45:21 +0000 (UTC)
archived-at: Mon, 07 Aug 2017 16:45:23 -0000

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

    https://github.com/apache/carbondata/pull/1179#discussion_r131705354
  
    --- Diff: hadoop/src/main/java/org/apache/carbondata/hadoop/api/DistributableDataMapFormat.java ---
    @@ -0,0 +1,135 @@
    +/*
    + * 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.carbondata.hadoop.api;
    +
    +import java.io.IOException;
    +import java.io.Serializable;
    +import java.util.ArrayList;
    +import java.util.Iterator;
    +import java.util.List;
    +
    +import org.apache.carbondata.core.indexstore.Blocklet;
    +import org.apache.carbondata.core.indexstore.DataMapDistributable;
    +import org.apache.carbondata.core.indexstore.DataMapStoreManager;
    +import org.apache.carbondata.core.indexstore.DataMapType;
    +import org.apache.carbondata.core.indexstore.TableDataMap;
    +import org.apache.carbondata.core.metadata.AbsoluteTableIdentifier;
    +import org.apache.carbondata.core.scan.filter.resolver.FilterResolverIntf;
    +import org.apache.carbondata.hadoop.util.ObjectSerializationUtil;
    +
    +import org.apache.hadoop.conf.Configuration;
    +import org.apache.hadoop.mapreduce.InputSplit;
    +import org.apache.hadoop.mapreduce.JobContext;
    +import org.apache.hadoop.mapreduce.RecordReader;
    +import org.apache.hadoop.mapreduce.TaskAttemptContext;
    +import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;
    +
    +/**
    + * Input format for datamaps, it makes the datamap pruning distributable.
    + */
    +public class DistributableDataMapFormat extends FileInputFormat<Void, Blocklet> implements
    +    Serializable {
    +
    +  private static final String FILTER_EXP = "mapreduce.input.distributed.datamap.filter";
    +
    +  private AbsoluteTableIdentifier identifier;
    +
    +  private String dataMapName;
    +
    +  private DataMapType dataMapType;
    +
    +  private List<String> validSegments;
    +
    +  public DistributableDataMapFormat(AbsoluteTableIdentifier identifier, String dataMapName,
    +      DataMapType dataMapType, List<String> validSegments) {
    +    this.identifier = identifier;
    +    this.dataMapName = dataMapName;
    +    this.dataMapType = dataMapType;
    +    this.validSegments = validSegments;
    +  }
    +
    +  public static void setFilterExp(Configuration configuration, FilterResolverIntf filterExp)
    +      throws IOException {
    +    if (filterExp != null) {
    +      String string = ObjectSerializationUtil.convertObjectToString(filterExp);
    +      configuration.set(FILTER_EXP, string);
    +    }
    +  }
    +
    +  private static FilterResolverIntf getFilterExp(Configuration configuration) throws IOException {
    +    String filterString = configuration.get(FILTER_EXP);
    +    if (filterString != null) {
    +      Object toObject = ObjectSerializationUtil.convertStringToObject(filterString);
    +      return (FilterResolverIntf) toObject;
    +    }
    +    return null;
    +  }
    +
    +  @Override public List<InputSplit> getSplits(JobContext job) throws IOException {
    +    TableDataMap dataMap =
    +        DataMapStoreManager.getInstance().getDataMap(identifier, dataMapName, dataMapType);
    +    List<DataMapDistributable> distributables = dataMap.toDistributable(validSegments);
    --- End diff --
    
    Can we first filter on the segment based on minmax ? If segments are more, even map reduce will take times


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