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ZStandard supports initialization of compressors and decompressors with a precomputed dictionary, which can dramatically improve and speed up compression of tables with small values. For more details, please see The Case For Small Data Compression https://github.com/facebook/zstd#the-case-for-small-data-compression Signed-off-by: Duo Zhang <zhangduo@apache.org> Conflicts: hbase-compression/hbase-compression-zstd/src/main/java/org/apache/hadoop/hbase/io/compress/zstd/ZstdCodec.java