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From: ppadma <git@git.apache.org>
To: dev@drill.apache.org
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References: <git-pr-611-drill@git.apache.org>
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Subject: [GitHub] drill pull request #611: Drill-4800: Improve parquet reader performance
Content-Type: text/plain
Message-Id: <20161026160125.692BBE0FC4@git1-us-west.apache.org>
Date: Wed, 26 Oct 2016 16:01:25 +0000 (UTC)
archived-at: Wed, 26 Oct 2016 16:01:29 -0000

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

    https://github.com/apache/drill/pull/611#discussion_r85152503
  
    --- Diff: exec/java-exec/src/main/java/org/apache/drill/exec/util/filereader/BufferedDirectBufInputStream.java ---
    @@ -0,0 +1,467 @@
    +/**
    + * 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
    + * <p/>
    + * http://www.apache.org/licenses/LICENSE-2.0
    + * <p/>
    + * 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.drill.exec.util.filereader;
    +
    +import com.google.common.base.Preconditions;
    +import io.netty.buffer.DrillBuf;
    +import org.apache.drill.common.config.DrillConfig;
    +import org.apache.drill.exec.memory.BufferAllocator;
    +import org.apache.drill.exec.memory.RootAllocatorFactory;
    +import org.apache.hadoop.conf.Configuration;
    +import org.apache.hadoop.fs.FSDataInputStream;
    +import org.apache.hadoop.fs.FileSystem;
    +import org.apache.hadoop.fs.Path;
    +import org.apache.parquet.hadoop.Footer;
    +import org.apache.parquet.hadoop.ParquetFileReader;
    +import org.apache.parquet.hadoop.metadata.BlockMetaData;
    +import org.apache.parquet.hadoop.metadata.ColumnChunkMetaData;
    +import org.apache.parquet.hadoop.util.CompatibilityUtil;
    +
    +import java.io.Closeable;
    +import java.io.IOException;
    +import java.io.InputStream;
    +import java.nio.ByteBuffer;
    +import java.util.List;
    +
    +/**
    + * <code>BufferedDirectBufInputStream</code>  reads from the
    + * underlying <code>InputStream</code> in blocks of data, into an
    + * internal buffer. The internal buffer is a direct memory backed
    + * buffer. The implementation is similar to the <code>BufferedInputStream</code>
    + * class except that the internal buffer is a Drillbuf and
    + * not a byte array. The mark and reset methods of the underlying
    + * <code>InputStream</code>are not supported.
    + */
    +public class BufferedDirectBufInputStream extends DirectBufInputStream implements Closeable {
    +
    +  private static final org.slf4j.Logger logger =
    +      org.slf4j.LoggerFactory.getLogger(BufferedDirectBufInputStream.class);
    +
    +  private static int defaultBufferSize = 8192 * 1024; // 8 MiB
    +  private static int defaultTempBufferSize = 8192; // 8 KiB
    +  private static int smallBufferSize = 64 * 1024; // 64 KiB
    +
    +  /**
    +   * The internal buffer to keep data read from the underlying inputStream.
    +   * <code>internalBuffer[0]</code>  through <code>internalBuffer[count-1] </code>
    +   * contains data read from the underlying  input stream.
    +   */
    +  protected volatile DrillBuf internalBuffer; // the internal buffer
    +
    +  /**
    +   * The number of valid bytes in <code>internalBuffer</code>.
    +   * <code> count </code> is always in the range <code>[0,internalBuffer.capacity]</code>
    +   * <code>internalBuffer[count-1]</code> is the last valid byte in the buffer.
    +   */
    +  protected int count;
    +
    +  /**
    +   * The current read position in the buffer; the index of the next
    +   * character to be read from the <code>internalBuffer</code> array.
    +   * <p/>
    +   * This value is always in the range <code>[0,count]</code>.
    +   * If <code>curPosInBuffer</code> is equal to <code>count></code> then we have read
    +   * all the buffered data and the next read (or skip) will require more data to be read
    +   * from the underlying input stream.
    +   */
    +  protected int curPosInBuffer;
    +
    +  protected long curPosInStream; // current offset in the input stream
    +
    +  private int bufSize;
    +
    +  private volatile DrillBuf tempBuffer; // a temp Buffer for use by read(byte[] buf, int off, int len)
    +
    +  private DrillBuf getBuf() throws IOException {
    +    checkInputStreamState();
    +    if (internalBuffer == null) {
    +      throw new IOException("Input stream is closed.");
    +    }
    +    return this.internalBuffer;
    +  }
    +
    +  /**
    +   * Creates a <code>BufferedDirectBufInputStream</code>
    +   * with the default (8 MiB) buffer size.
    +   */
    +  public BufferedDirectBufInputStream(InputStream in, BufferAllocator allocator, String id,
    +      long startOffset, long totalByteSize, boolean enableHints) {
    +    this(in, allocator, id, startOffset, totalByteSize, defaultBufferSize, enableHints);
    +  }
    +
    +  /**
    +   * Creates a <code>BufferedDirectBufInputStream</code>
    +   * with the specified buffer size.
    +   */
    +  public BufferedDirectBufInputStream(InputStream in, BufferAllocator allocator, String id,
    +      long startOffset, long totalByteSize, int bufSize, boolean enableHints) {
    +    super(in, allocator, id, startOffset, totalByteSize, enableHints);
    +    Preconditions.checkArgument(bufSize >= 0);
    +    // We make the buffer size the smaller of the buffer Size parameter or the total Byte Size
    +    // rounded to next highest pwoer of two
    --- End diff --
    
    typo: power


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