[GitHub] [hbase] virajjasani commented on a change in pull request #3691: HBASE-26259 Fallback support to pure Java compression

[GitBox <gi...@apache.org>]

virajjasani commented on a change in pull request #3691:
URL: https://github.com/apache/hbase/pull/3691#discussion_r722302574



##########
File path: hbase-compression/hbase-compression-aircompressor/src/main/java/org/apache/hadoop/hbase/io/compress/aircompressor/SnappyCodec.java
##########
@@ -0,0 +1,144 @@
+/*
+ * 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.hadoop.hbase.io.compress.aircompressor;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+
+import io.airlift.compress.snappy.SnappyCompressor;
+import io.airlift.compress.snappy.SnappyDecompressor;
+
+import org.apache.hadoop.conf.Configurable;
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.fs.CommonConfigurationKeys;
+import org.apache.hadoop.io.compress.BlockCompressorStream;
+import org.apache.hadoop.io.compress.BlockDecompressorStream;
+import org.apache.hadoop.io.compress.CompressionCodec;
+import org.apache.hadoop.io.compress.CompressionInputStream;
+import org.apache.hadoop.io.compress.CompressionOutputStream;
+import org.apache.hadoop.io.compress.Compressor;
+import org.apache.hadoop.io.compress.Decompressor;
+import org.apache.yetus.audience.InterfaceAudience;
+
+/**
+ * Hadoop snappy codec implemented with aircompressor.
+ * <p>
+ * This is data format compatible with Hadoop's native snappy codec.
+ */
+@InterfaceAudience.Private
+public class SnappyCodec implements Configurable, CompressionCodec {
+
+  private Configuration conf;
+
+  public SnappyCodec() {
+    conf = new Configuration();
+  }
+
+  @Override
+  public Configuration getConf() {
+    return conf;
+  }
+
+  @Override
+  public void setConf(Configuration conf) {
+    this.conf = conf;
+  }
+
+  @Override
+  public Compressor createCompressor() {
+    return new HadoopSnappyCompressor();
+  }
+
+  @Override
+  public Decompressor createDecompressor() {
+    return new HadoopSnappyDecompressor();
+  }
+
+  @Override
+  public CompressionInputStream createInputStream(InputStream in) throws IOException {
+    return createInputStream(in, createDecompressor());
+  }
+
+  @Override
+  public CompressionInputStream createInputStream(InputStream in, Decompressor d)
+      throws IOException {
+    return new BlockDecompressorStream(in, d, getBufferSize(conf));
+  }
+
+  @Override
+  public CompressionOutputStream createOutputStream(OutputStream out) throws IOException {
+    return createOutputStream(out, createCompressor());
+  }
+
+  @Override
+  public CompressionOutputStream createOutputStream(OutputStream out, Compressor c)
+      throws IOException {
+    int bufferSize = getBufferSize(conf);
+    int compressionOverhead = (bufferSize / 6) + 32;
+    return new BlockCompressorStream(out, c, bufferSize, compressionOverhead);
+  }
+
+  @Override
+  public Class<? extends Compressor> getCompressorType() {
+    return HadoopSnappyCompressor.class;
+  }
+
+  @Override
+  public Class<? extends Decompressor> getDecompressorType() {
+    return HadoopSnappyDecompressor.class;
+  }
+
+  @Override
+  public String getDefaultExtension() {
+    return ".snappy";
+  }
+
+  private static int getBufferSize(Configuration conf) {
+    int size = conf.getInt(
+      CommonConfigurationKeys.IO_COMPRESSION_CODEC_SNAPPY_BUFFERSIZE_KEY,
+      CommonConfigurationKeys.IO_COMPRESSION_CODEC_SNAPPY_BUFFERSIZE_DEFAULT);
+    return size > 0 ? size : 256 * 1024;
+  }
+
+  @InterfaceAudience.Private

Review comment:
       Sounds good.




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