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From GitBox <...@apache.org>
Subject [GitHub] [flink] JingsongLi commented on a change in pull request #7941: [FLINK-11858][table-runtime-blink] Introduce block compression to batch table runtime
Date Fri, 08 Mar 2019 07:31:44 GMT
JingsongLi commented on a change in pull request #7941: [FLINK-11858][table-runtime-blink]
Introduce block compression to batch table runtime
URL: https://github.com/apache/flink/pull/7941#discussion_r263675547
 
 

 ##########
 File path: flink-table/flink-table-runtime-blink/src/main/java/org/apache/flink/table/runtime/compression/Lz4BlockCompressor.java
 ##########
 @@ -0,0 +1,104 @@
+/*
+ * 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.flink.table.runtime.compression;
+
+import net.jpountz.lz4.LZ4Compressor;
+import net.jpountz.lz4.LZ4Exception;
+import net.jpountz.lz4.LZ4Factory;
+
+import java.nio.BufferOverflowException;
+import java.nio.ByteBuffer;
+
+/**
+ * Encode data into LZ4 format (not compatible with the LZ4 Frame format).
+ * It reads from and writes to byte arrays provided from the outside, thus reducing copy
time.
+ * <p>
+ * This class is copied and modified from {@link net.jpountz.lz4.LZ4BlockOutputStream}.
+ */
+public class Lz4BlockCompressor implements BlockCompressor {
+
+	private final LZ4Compressor compressor;
+
+	public Lz4BlockCompressor() {
+		this.compressor = LZ4Factory.fastestInstance().fastCompressor();
+	}
+
+	@Override
+	public int getMaxCompressedSize(int srcSize) {
+		return Lz4BlockCompressionFactory.HEADER_LENGTH + compressor.maxCompressedLength(srcSize);
 
 Review comment:
   import Lz4BlockCompressionFactory.HEADER_LENGTH?

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