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HDFS, mail # user - Understanding compression in hdfs

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Understanding compression in hdfs
Yaron Gonen 2012-07-29, 14:40
I've created a SequeceFile.Writer with block-level compression.
I'd like to create a SHA1 hash for each block written. How do I do that? I
didn't see any way to take the compression under my control in order to
know when a block is over.