Nicholas Chammas created SPARK-5685:
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Summary: Show warning when users open text files compressed with
non-splittable algorithms like gzip
Key: SPARK-5685
URL: https://issues.apache.org/jira/browse/SPARK-5685
Project: Spark
Issue Type: Improvement
Components: Spark Core
Reporter: Nicholas Chammas
Priority: Minor
This is a usability or user-friendliness issue.
It's extremely common for people to load a text file compressed with gzip,
process it, and then wonder why only 1 core in their cluster is doing any work.
Some examples:
* http://stackoverflow.com/q/28127119/877069
* http://stackoverflow.com/q/27531816/877069
I'm not sure how this problem can be generalized, but at the very least it
would be helpful if Spark displayed some kind of warning in the common case
when someone opens a gzipped file with {{sc.textFile}}.
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