vinaysbadami commented on pull request #2795: URL: https://github.com/apache/hadoop/pull/2795#issuecomment-842000750
@anoopsjohn ==> wrt your comment on "will this hamper spark jobs". 1. This is a speculative read ahead. So whenever this is wrong, it is waste io and iops. 2. With parquet etc, the reads tend to be random. Hence a smaller read ahead depth is prefereable 3. Based on debugging various customer perf isues, we rarely saw benefit of > 2 4. This config is per inputstream and not global across streams. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: [email protected] --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
