Arnaud-Nauwynck opened a new pull request, #6378: URL: https://github.com/apache/hadoop/pull/6378
see [https://issues.apache.org/jira/browse/MAPREDUCE-7465](https://issues.apache.org/jira/browse/MAPREDUCE-7465) when commiting a big hadoop job (for example via Spark) having many partitions, the class FileOutputCommiter process thousands of dirs/files to rename with a single Thread. This is performance issue, caused by lot of waits on FileStystem storage operations. I propose that above a configurable threshold (default=3, configurable via property 'mapreduce.fileoutputcommitter.parallel.threshold'), the class FileOutputCommiter process the list of files to rename using parallel threads, using the default jvm ExecutorService (ForkJoinPool.commonPool()) -- 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. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected] --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
