Github user rxin commented on the pull request:
https://github.com/apache/spark/pull/1242#issuecomment-68296918
The size of the data is 100GB in its uncompressed binary representation.
You are probably compressing the data when you saved it as sequence file. When
you save it as text file, the text representation is much larger (i.e. a single
byte is shown as multiple byte in text).
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