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Bhallamudi Venkata Siva Kamesh commented on MAPREDUCE-3952: ----------------------------------------------------------- I *think*, input file might be an empty file. If so, CombineFileInputFormat#getSplits just returns empty *splits* list. Where as FileInputFormat#getSplits creats a file split of length 0 for each empty file and adds it to *splits* list. So the number of file splits is atleast 1. BTW Why do we need to submit a job having an empty input file(s) to framework? > In MR2, when Total input paths to process == 1, > CombinefileInputFormat.getSplits() returns 0 split. > --------------------------------------------------------------------------------------------------- > > Key: MAPREDUCE-3952 > URL: https://issues.apache.org/jira/browse/MAPREDUCE-3952 > Project: Hadoop Map/Reduce > Issue Type: Bug > Components: mrv2 > Reporter: Zhenxiao Luo > > Hive get unexpected result when using MR2(When using MR1, always get expected > result). > In MR2, when Total input paths to process == 1, > CombinefileInputFormat.getSplits() returns 0 split. > The calling code in Hive, in Hadoop23Shims.java: > InputSplit[] splits = super.getSplits(job, numSplits); > this get splits.length == 0. > In MR1, everything goes fine, the calling code in Hive, in Hadoop20Shims.java: > CombineFileSplit[] splits = (CombineFileSplit[]) super.getSplits(job, > numSplits); > this get splits.length == 1. -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa For more information on JIRA, see: http://www.atlassian.com/software/jira