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Re: Exception when joining HIVE tables - Hive - [mail # user]
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..."select * from table" does not use map-reduce so it seems your error has to do with hadoop/map-reduce, not hive i would run some test for map-reduce On Wed, Sep 21, 2011 at 4:11 PM, Kr...
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Author: Koert Kuipers,
2011-09-21, 20:49
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remove duplicates based on one (or a few) columns - Hive - [mail # user]
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...what is the easiest way to remove rows which are considered duplicates based upon a few columns in the rows? so "create table deduped as select distinct * from table" won't do......
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Author: Koert Kuipers,
2011-09-14, 21:10
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Re: Hive thrift interface and user permissions / user auditing - Hive - [mail # user]
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...ah sorry the user "thrift" that was a typo by me. it actually says ugi=hive in my logs. i missed that the first time you asked. regarding JDBC, i was mainly interested if JDBC would be...
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Author: Koert Kuipers,
2011-09-07, 17:16
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Re: Hive thrift interface and user permissions / user auditing - Hive - [mail # user]
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...The metastore is running as user "hive", and we are indeed running unsecured mode. Do i understand it correctly that in the thrift interface does provide a way to communicate the identity bu...
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Author: Koert Kuipers,
2011-09-06, 16:09
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Hive thrift interface and user permissions / user auditing - Hive - [mail # user]
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...When i run a query from the hive command line client i can see that it is being run as me (for example, in HDFS log i see INFO org.apache.hadoop.hdfs.server.namenode.FSNamesystem.audit: ugi=...
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Author: Koert Kuipers,
2011-09-06, 15:22
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Re: UDAF and group by - Hive - [mail # user]
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...Thanks for your response. My thinking was that by turning off hive.map.aggr hive would do the following: col3 becomes the key in mapping. All rows with same col3 go to same reducer. In the r...
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Author: Koert Kuipers,
2011-09-05, 16:54
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Re: UDAF and group by - Hive - [mail # user]
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...Hey, my question wasn't very clear. I have a UDAF that I apply per group. The UDAF does not support terminatePartial() and merge(). So to do this i run: set hive.map.aggr=false; select...
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Author: Koert Kuipers,
2011-09-04, 15:08
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UDAF and group by - Hive - [mail # user]
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...If i run my own UDAF with group by, can i be sure that a single UDAF instance initialized once will process all members in a group? Or should i code so as to take into account the situation ...
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Author: Koert Kuipers,
2011-08-30, 13:34
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Re: Re: multiple tables join with only one hug table. - Hive - [mail # user]
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...I am not aware of any optimization that does something like that. Anyone? Also your suggestion means 10 hash tables would have to be in memory. I think that with a normal map-reduce jo...
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Author: Koert Kuipers,
2011-08-14, 00:58
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Re: multiple tables join with only one hug table. - Hive - [mail # user]
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...A mapjoin does what you described: it builds hash tables for the smaller tables. In recent versions of hive (like the one i am using with cloudera cdh3u1) a mapjoin will be done for you auto...
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Author: Koert Kuipers,
2011-08-12, 17:17
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