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Re: Partition by directory - Hive - [mail # user]
...Erik, Did you find out the answer to this? I would be curious to hear what the problem is.  BTW, I would check the hive logs (/var/log/apps/hive or /var/log/hive or similar on EMR). Try...
   Author: Mark Grover, 2012-12-14, 09:01
Re: help on failed MR jobs (big hive files) - Hive - [mail # user]
...Elaine, Nitin raises some good points.  Continuing on the same lines, let's take a closer look at the query: insert overwrite table B select a, b, c from table A where datediff(to_date(...
   Author: Mark Grover, 2012-12-13, 07:46
Re: map side join with group by - Hive - [mail # user]
...Hi Chen, I think we would need some more information.  The query is referring to a table called "d" in the MAPJOIN hint but there is not such table in the query. Moreover, Map joins onl...
   Author: Mark Grover, 2012-12-13, 01:41
Re: Hive double-precision question - Hive - [mail # user]
...Periya: If you want to see what the built in Hive UDFs are doing, the code is here: https://github.com/apache/hive/tree/trunk/ql/src/java/org/apache/hadoop/hive/ql/udf/generic and https://gi...
   Author: Mark Grover, 2012-12-07, 22:02
Re: Determining DateDiff By Minutes in Hive - Hive - [mail # user]
...George, There is a datediff UDF which will tell you the difference between 2 dates. https://cwiki.apache.org/confluence/display/Hive/LanguageManual+UDF#LanguageManualUDF-DateFunctions  ...
   Author: Mark Grover, 2012-12-05, 20:53
Re: handling null argument in custom udf - Hive - [mail # user]
...Soren, Can you give the complete stack trace? Or share the code? Perhaps, the skeletal code. Look at Ceil UDF for example, it has a null check, you should be able to do something similar: ht...
   Author: Mark Grover, 2012-12-05, 03:31
Re: cross join - Hive - [mail # user]
...Periya, I am using Hive-0.8.1 and was able to get joins to work with: 1. No on clause 2. "on (true)" as the on clause to work.  I am not entirely sure why you are getting exceptions wit...
   Author: Mark Grover, 2012-12-04, 07:59
Re: Hive 0.7 use the old mapred API - Hive - [mail # user]
...Yong, In my opinion, #2 wouldn't be that hard to do.  Of course, upgrading to the new API (albeit by updating Hive) would the right thing to do long term.  Mark  On Mon, Dec 3...
   Author: Mark Grover, 2012-12-04, 07:47
Re: Skew join failure - Hive - [mail # user]
...Hey David, Sure thing. Play around with that property's value, see if that makes any difference.  Also, if you could search to see if a file with a name like *hive_skew_join_ **bigkeys*...
   Author: Mark Grover, 2012-12-04, 06:01
Re: Storing data in TSV with changing headers - Hive - [mail # user]
...Hi Marc, While what Dean said is true for different schemas in general, there is a way to do it all in the same table if the schema changes to the TSV file are just additions of new tab-sepa...
   Author: Mark Grover, 2012-11-30, 15:12
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