Github user mridulm commented on the issue: https://github.com/apache/spark/pull/15422 @srowen The tuples already returned would have been valid, it is the subsequent block decompression which has failed. For example, in a 1gb file, the last few bytes missing (or corrupt) will cause the last block to be decompressed incorrectly - but all previous tuples already returned would be fine and valid. The 'current' key/value resulted in exception. Note that the returned value from the method is not used when finished = true (what is returned is ignored).
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