Um, this is weird. It simply isn't modifying the order of the returned rows at all. I get the same result with no 'order by' clause as with one. Adding a limit or specifying 'asc' has no effect. Using 'sort by' also has no effect. The column used for ordering is type INT. In the example below, I was hoping to "sort" or "order" the results according to the third column. Like I said, I also tried adding 'limit 10' and/or 'asc' to the end of the query; they had no effect. The jobtracker shows a single mapper and a single reducer being used for the job incidentally, so it can't be some sort of multi-reducer sort discrepancy.
hive> describe stringmap; OK objecttypecode int attributename string attributevalue int langid int value string displayorder int Time taken: 0.074 seconds hive> hive> select * from stringmap where attributename='foo' order by 'attributevalue'; Total MapReduce jobs = 1 Launching Job 1 out of 1 Number of reduce tasks determined at compile time: 1 In order to change the average load for a reducer (in bytes): set hive.exec.reducers.bytes.per.reducer=<number> In order to limit the maximum number of reducers: set hive.exec.reducers.max=<number> In order to set a constant number of reducers: set mapred.reduce.tasks=<number> Starting Job = job_201202221500_0114, Tracking URL = http://localhost:50030/jobdetails.jsp?jobid=job_201202221500_0114 Kill Command = /media/sdb1/kwiley/hadoop/hadoop-0.20.2-cdh3u3/bin/hadoop job -Dmapred.job.tracker=localhost:9001 -kill job_201202221500_0114 2012-03-13 14:45:28,418 Stage-1 map = 0%, reduce = 0% 2012-03-13 14:45:31,428 Stage-1 map = 100%, reduce = 0% 2012-03-13 14:45:39,459 Stage-1 map = 100%, reduce = 33% 2012-03-13 14:45:40,463 Stage-1 map = 100%, reduce = 100% Ended Job = job_201202221500_0114 OK 3 foo 6 1033 6 - aaa 6 3 foo 3 1033 3 - bbb 3 3 foo 4 1033 4 - ccc 4 4 foo 1 1033 Default Value 1 3 foo 2 1033 2 - ddd 2 3 foo 1 1033 1 - eee 1 3 foo 5 1033 5 - fff 5 Time taken: 17.954 seconds hive> ________________________________________________________________________________ Keith Wiley kwi...@keithwiley.com keithwiley.com music.keithwiley.com "Luminous beings are we, not this crude matter." -- Yoda ________________________________________________________________________________
