Github user 10110346 commented on the issue:
https://github.com/apache/spark/pull/22358
It is using reflection to acquire hadoop classes for compression which are
not in the supplied dependencies(hadoop-common-2.6.5.jar,
hadoop-common-2.7.0.jar, hadoop-common-3.1.0.jar).
`BROTLI("org.apache.hadoop.io.compress.BrotliCodec",
CompressionCodec.BROTLI, ".br"),
ZSTD("org.apache.hadoop.io.compress.ZStandardCodec", CompressionCodec.ZSTD,
".zstd");`
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