wenweijian created HADOOP-18788:
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Summary: Support LZ4 compressionLevel
Key: HADOOP-18788
URL: https://issues.apache.org/jira/browse/HADOOP-18788
Project: Hadoop Common
Issue Type: New Feature
Components: common
Reporter: wenweijian
The Hadoop's LZ4 compression codec now depends on lz4-java. There two type of
compressor in lz4, `fastCompressor` and `highCompressor`. The default lz4
compressor in hadoop is fastCompressor, we also can use highCompressor by using
config `IO_COMPRESSION_CODEC_LZ4_USELZ4HC_DEFAULT`
When we want to use highCompressor in hadoop, we only can use the default
compression level, which is level 9. while highCompressor in lz4-java supports
compression level from 1 to 17.
I think we can set a configuration to let users to choose different
compresssionLevel for lz4 highCompressor.
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