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ASF GitHub Bot commented on PARQUET-2196: ----------------------------------------- wgtmac commented on code in PR #1000: URL: https://github.com/apache/parquet-mr/pull/1000#discussion_r992914232 ########## parquet-hadoop/src/main/java/org/apache/parquet/hadoop/codec/Lz4RawDecompressor.java: ########## @@ -0,0 +1,46 @@ +/* + * 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.parquet.hadoop.codec; + +import io.airlift.compress.lz4.Lz4Decompressor; + +import java.io.IOException; +import java.nio.ByteBuffer; + +public class Lz4RawDecompressor extends NonBlockedDecompressor { + + private Lz4Decompressor decompressor = new Lz4Decompressor(); + + @Override + protected int uncompress(ByteBuffer compressed, ByteBuffer uncompressed) throws IOException { + decompressor.decompress(compressed, uncompressed); + int uncompressedSize = uncompressed.position(); + uncompressed.limit(uncompressedSize); + uncompressed.rewind(); + return uncompressedSize; + } + + @Override + protected int uncompressedLength(ByteBuffer compressed, int maxUncompressedLength) throws IOException { Review Comment: Renamed to maxUncompressedLength > Support LZ4_RAW codec > --------------------- > > Key: PARQUET-2196 > URL: https://issues.apache.org/jira/browse/PARQUET-2196 > Project: Parquet > Issue Type: Improvement > Components: parquet-mr > Reporter: Gang Wu > Priority: Major > > There is a long history about the LZ4 interoperability of parquet files > between parquet-mr and parquet-cpp (which is now in the Apache Arrow). > Attached links are the evidence. In short, a new LZ4_RAW codec type has been > introduced since parquet format v2.9.0. However, only parquet-cpp supports > LZ4_RAW. The parquet-mr library still uses the old Hadoop-provided LZ4 codec > and cannot read parquet files with LZ4_RAW. -- This message was sent by Atlassian Jira (v8.20.10#820010)