https://community.cloudera.com/t5/Archives-of-Support-Questions/Hadoop-MapReduce-sorting-order/m-p/127224#M39189 <P>For equal rowkey, random, otherwise, sorted by rowkey as a String. Same behavior in Hadoop 1.X and 2.X.</P> Thu, 29 Dec 2016 05:18:04 GMT cstanca 2016-12-29T05:18:04Z https://community.cloudera.com/t5/Archives-of-Support-Questions/Hadoop-MapReduce-sorting-order/m-p/127223#M39188 <P>I have developed MapReduce job which has - - One input split and thus one map task - map i/p key is Path and value is BytesWritable (one min log file) - map o/p key is Text and value is also Text (Record from min file) - I have configured no of reducers to 1</P> <P>I know map outputs will get sorted based on natural order of key, but what will be the order for the records having same key? Will it be based on First-In-First-Out? Lets say for same key map emits output id FIFO basis, will that same order get preserved when it comes to reducer ? Also, if you can let me know if this behavior is same in hadoop 1.X and 2.X? </P> <P>Note: I have not implemented Secondary sort.</P> Wed, 31 Aug 2016 01:25:10 GMT https://community.cloudera.com/t5/Archives-of-Support-Questions/Hadoop-MapReduce-sorting-order/m-p/127223#M39188 kk778j 2016-08-31T01:25:10Z https://community.cloudera.com/t5/Archives-of-Support-Questions/Hadoop-MapReduce-sorting-order/m-p/127224#M39189 <P>For equal rowkey, random, otherwise, sorted by rowkey as a String. Same behavior in Hadoop 1.X and 2.X.</P> Thu, 29 Dec 2016 05:18:04 GMT https://community.cloudera.com/t5/Archives-of-Support-Questions/Hadoop-MapReduce-sorting-order/m-p/127224#M39189 cstanca 2016-12-29T05:18:04Z