richardstartin commented on a change in pull request #7655: URL: https://github.com/apache/pinot/pull/7655#discussion_r738697112
########## File path: pinot-segment-local/src/main/java/org/apache/pinot/segment/local/io/compression/LZ4WithLengthDecompressor.java ########## @@ -0,0 +1,52 @@ +/** + * 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.pinot.segment.local.io.compression; + +import java.io.IOException; +import java.nio.ByteBuffer; +import net.jpountz.lz4.LZ4DecompressorWithLength; +import net.jpountz.lz4.LZ4Factory; +import org.apache.pinot.segment.spi.compression.ChunkDecompressor; + + +/** + * Identical to {@code LZ4Decompressor} but can determine the length of + * the decompressed output + */ +public class LZ4WithLengthDecompressor implements ChunkDecompressor { + + private final LZ4DecompressorWithLength _decompressor; + + LZ4WithLengthDecompressor() { + _decompressor = new LZ4DecompressorWithLength(LZ4Factory.fastestInstance().fastDecompressor()); Review comment: The difference is `LZ4FastDecompressor` needs to know the length of the uncompressed input, so is only really safe to use this way (this will make using LZ4 faster in theory), whereas `LZ4SafeDecompressor` works the way we were using it (there's some stuff in the Javadoc but there is a distracting mistake in `LZ4SafeDecompressor` where it mixes up compressed and uncompressed, but `LZ4FastDecompressor`'s javadoc is unambiguous). -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected] --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
