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string to int conversion (with leading zeros) - Hive - [mail # user]
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...Hi all, I need to convert a string attribute that contains ints with occasional leading zeroes. Unfortunately, I can't simply cast() as Hive will try to parse those numbers as octals. ...
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Author: Igor Tatarinov,
2013-04-11, 18:23
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Re: Huge join performance issue - Hive - [mail # user]
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...Did you verify that all your available mappers are running (and reducers too)? If you have a small number of partitions with huge files, you might me underutilizing mappers (check that the f...
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Author: Igor Tatarinov,
2013-04-08, 18:39
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Re: Need rank() - Hive - [mail # user]
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...You are getting the error because you are ORDERing BY rank but rank is not in the top SELECT Also, DISTRIBUTE BY/SORT BY are done after SELECT so you have to use a subquery: SELECT ......
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Author: Igor Tatarinov,
2013-04-02, 17:56
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Re: question about machine learning on Hive - Hive - [mail # user]
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...Here is how Twitter does it with Pig: http://www.umiacs.umd.edu/~jimmylin/publications/Lin_Kolcz_SIGMOD2012.pdf We use a similar approach and I think that Pig, being somewhat lower-lev...
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Author: Igor Tatarinov,
2013-01-17, 21:29
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Re: Rolling MAU computation - Hive - [mail # user]
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...You just need to put the join condition in the WHERE clause. That way Hive will do a cartesian product followed by a filter. On Fri, Oct 12, 2012 at 1:02 PM, Tom Hubina wrote: &n...
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Author: Igor Tatarinov,
2012-10-12, 20:08
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Re: Rolling MAU computation - Hive - [mail # user]
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...If you have a lot of data, you might have to write a custom reducer (in python) to keep track of the moving date window. If you don't have that much data, you might want to use a temp ...
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Author: Igor Tatarinov,
2012-10-11, 06:05
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Re: Long running Join Query - Reduce task fails due to failing to report status - Hive - [mail # user]
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...Why don't you try splitting the big query into smaller ones? On Fri, Aug 24, 2012 at 10:20 AM, Tim Havens wrote: te: e s 000 rows: used memory = 408582240 000 rows: used m...
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Author: Igor Tatarinov,
2012-08-24, 17:44
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Re: Changing table types from managed to external - Hive - [mail # user]
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...Try ALTER TABLE SET TBLPROPERTIES('EXTERNAL'='TRUE'); It worked for me. igor decide.com On Mon, Aug 6, 2012 at 11:08 PM, Babe Ruth wrote: ...
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Author: Igor Tatarinov,
2012-08-07, 06:26
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Re: schema of hive database - Hive - [mail # user]
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...Try describe formatted igor decide.com On Thu, Aug 2, 2012 at 12:04 PM, Anson Abraham wrote: ...
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Author: Igor Tatarinov,
2012-08-02, 19:13
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Nested SELECT DISTINCT runs out of memory - Hive - [mail # user]
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...I have this query that consistently fails with out-of-memory errors. I know it can be re-written without a nested subquery (using count distinct) and then it runs fine. Why does this q...
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Author: Igor Tatarinov,
2012-07-26, 18:40
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