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Re: Creating external table poiting to s3 folder with files not loading data - Hive - [mail # user]
...Fernando, It is more likely related to your SerDe and the underlying data not matching up to it and than being related to the table being external on S3.  Mark  On Tue, Dec 11, 201...
   Author: Mark Grover, 2012-12-14, 09:05
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
[expand - 1 more] - 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
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