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From sameeragarwal <...@git.apache.org>
Subject [GitHub] spark pull request #14174: [SPARK-16524][SQL] Add RowBatch and RowBasedHashM...
Date Tue, 19 Jul 2016 00:06:49 GMT
Github user sameeragarwal commented on a diff in the pull request:

    https://github.com/apache/spark/pull/14174#discussion_r71253434
  
    --- Diff: sql/catalyst/src/main/java/org/apache/spark/sql/catalyst/expressions/RowBasedKeyValueBatch.java
---
    @@ -0,0 +1,322 @@
    +/*
    + * 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.spark.sql.catalyst.expressions;
    +
    +import java.io.IOException;
    +
    +import org.apache.spark.memory.MemoryConsumer;
    +import org.apache.spark.memory.TaskMemoryManager;
    +import org.apache.spark.sql.types.*;
    +import org.apache.spark.unsafe.memory.MemoryBlock;
    +import org.apache.spark.unsafe.Platform;
    +
    +
    +/**
    + * RowBasedKeyValueBatch stores key value pairs in contiguous memory region.
    + *
    + * Each key or value is stored as a single UnsafeRow. The format for each record looks
like this:
    + * [4 bytes total size = (klen + vlen + 4)] [4 bytes key size = klen]
    + * [UnsafeRow for key of length klen] [UnsafeRow for Value of length vlen]
    + * [8 bytes pointer to next]
    + * Thus, record length = 8 + klen + vlen + 8
    + *
    + * RowBasedKeyValueBatch will automatically acquire new pages (MemoryBlock) when the
current page
    + * is used up.
    + *
    + * TODO: making each entry more compact, e.g., combine key and value into a single UnsafeRow
    + */
    +public final class RowBasedKeyValueBatch extends MemoryConsumer{
    +  private static final int DEFAULT_CAPACITY = 1 << 16;
    +  private static final long DEFAULT_PAGE_SIZE = 64 * 1024 * 1024;
    +
    +  private final StructType keySchema;
    +  private final StructType valueSchema;
    +  private final int capacity;
    +  private int numRows = 0;
    +
    +  // Staging row returned from getRow.
    +  final UnsafeRow keyRow;
    +  final UnsafeRow valueRow;
    +
    +  // ids for current key row and value row being retrieved
    +  private int keyRowId = -1;
    +
    +  // full addresses for key rows and value rows
    +  private long[] keyOffsets;
    +
    +  // if all data types in the schema are fixed length
    +  private boolean allFixedLength;
    +  private int klen;
    +  private int vlen;
    +  private int recordLength;
    +
    +  private MemoryBlock currentAndOnlyPage = null;
    +  private Object currentAndOnlyBase = null;
    +  private long recordStartOffset;
    +  private long pageCursor = 0;
    +
    +  public static RowBasedKeyValueBatch allocate(StructType keySchema, StructType valueSchema,
    +                                               TaskMemoryManager manager) {
    +    return new RowBasedKeyValueBatch(keySchema, valueSchema, DEFAULT_CAPACITY, manager);
    +  }
    +
    +  public static RowBasedKeyValueBatch allocate(StructType keySchema, StructType valueSchema,
    +                                               TaskMemoryManager manager, int maxRows)
{
    +    return new RowBasedKeyValueBatch(keySchema, valueSchema, maxRows, manager);
    +  }
    +
    +  public int numRows() { return numRows; }
    +
    +  public void close() {
    +    if (currentAndOnlyPage != null) {
    +      freePage(currentAndOnlyPage);
    +      currentAndOnlyPage = null;
    +    }
    +  }
    +
    +  private boolean acquireNewPage(long required) {
    +    try {
    +      currentAndOnlyPage = allocatePage(required);
    +    } catch (OutOfMemoryError e) {
    +      return false;
    +    }
    +    currentAndOnlyBase = currentAndOnlyPage.getBaseObject();
    +    Platform.putInt(currentAndOnlyBase, currentAndOnlyPage.getBaseOffset(), 0);
    +    pageCursor = 4;
    +    recordStartOffset = pageCursor + currentAndOnlyPage.getBaseOffset();
    +
    +    return true;
    +  }
    +
    +  private long getKeyOffsetForFixedLengthRecords(int rowId) {
    +    return recordStartOffset + rowId * recordLength + 8;
    +  }
    +
    +  public UnsafeRow appendRow(Object kbase, long koff, int klen,
    --- End diff --
    
    Can we add a small comment saying that this returns the value row?


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