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https://issues.apache.org/jira/browse/PARQUET-2196?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17623712#comment-17623712
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ASF GitHub Bot commented on PARQUET-2196:
-----------------------------------------
pitrou commented on code in PR #1000:
URL: https://github.com/apache/parquet-mr/pull/1000#discussion_r1004251867
##########
parquet-common/src/main/java/org/apache/parquet/hadoop/metadata/CompressionCodecName.java:
##########
@@ -30,7 +30,8 @@ public enum CompressionCodecName {
LZO("com.hadoop.compression.lzo.LzoCodec", CompressionCodec.LZO, ".lzo"),
BROTLI("org.apache.hadoop.io.compress.BrotliCodec", CompressionCodec.BROTLI,
".br"),
LZ4("org.apache.hadoop.io.compress.Lz4Codec", CompressionCodec.LZ4, ".lz4"),
- ZSTD("org.apache.parquet.hadoop.codec.ZstandardCodec",
CompressionCodec.ZSTD, ".zstd");
+ ZSTD("org.apache.parquet.hadoop.codec.ZstandardCodec",
CompressionCodec.ZSTD, ".zstd"),
+ LZ4_RAW("org.apache.parquet.hadoop.codec.Lz4RawCodec",
CompressionCodec.LZ4_RAW, ".lz4raw");
Review Comment:
I think both file extensions for LZ4 and LZ4RAW should be removed.
The reason is that the `lz4` command-line utilities expect the LZ4 frame
format.
In any case, the `.lz4` extension should certainly not be used for the
"Hadoop LZ4" compression codec.
> 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.
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