Thanks mbigelow, following your suggestions I solved the massive error logging issue. I've processed in a Json validator the specific log file referenced in the Java stack trace: /user/spark/applicationHistory/application_1494352758818_0117_1 But the format was correct, according to the validator. So I just moved it away in a temporary directory. As soon as I did it, the error messages stopped clogging the system logs. So it was probably corrupted in a very subtle way... But it was definitely corrupted That Json file has been indeed generated by the Spark Action that is giving me problems, but it was an OLD file. New instances of that Spark Action are generating new Json logs, but they are not giving any troubles to the History Server (stopped having tons of exceptions logged as I just said) Unfortunately, the Spark job itself is still failing and it's needing further investigation on my side, so apparently this is not related to that specific error message. But I've solved an annoying problem, and at the same time I have cleared out the possibility of the Spark Action issue being related to that java exception Thanks!
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