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Re: Map Reduce Local Task - Hive - [mail # user]
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...That setting will make Hive more aggressive about trying to convert a join to a local task, where it bypasses the job tracker. When you're experimenting with queries on a small data set, it ...
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Author: Dean Wampler,
2013-01-08, 15:59
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Re: Does Hue (Hadoop User Experience) works with Apache HIVE/HADOOP - Hive - [mail # user]
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...If you're willing to consider a commercial option, Karmasphere is already supported on EMR. http://aws.amazon.com/elasticmapreduce/karmasphere/ On Sat, Dec 29, 2012 at 1:29 AM, C...
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Author: Dean Wampler,
2012-12-29, 15:18
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Re: hive regular expression - Hive - [mail # user]
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...Hive uses Java's regex API. This tutorial provides an excellent introduction. http://docs.oracle.com/javase/tutorial/essential/regex/ dean On Wed, Dec 26, 2012 at 12:46 PM,...
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Author: Dean Wampler,
2012-12-26, 18:50
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Re: Reflect MySQL updates into Hive - Hive - [mail # user]
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...Looks good, but a few suggestions. If you can eliminate duplicates, etc. as you ingest the data into HDFS, that would eliminate a cleansing step. Note that if the target directory in HDFS IS...
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Author: Dean Wampler,
2012-12-24, 18:12
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Re: Reflect MySQL updates into Hive - Hive - [mail # user]
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...This is not as hard as it sounds. The hardest part is setting up the incremental query against your MySQL database. Then you can write the results to new files in the HDFS directory for the ...
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Author: Dean Wampler,
2012-12-24, 14:51
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Re: Creating external table poiting to s3 folder with files not loading data - Hive - [mail # user]
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...You raise an important point; "metadata" commands like create table and alter table only affect metadata, not the actual data itself. So, you have to write the files into the partition direc...
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Author: Dean Wampler,
2012-12-17, 15:07
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Re: Creating external table poiting to s3 folder with files not loading data - Hive - [mail # user]
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...A couple of clarifying questions and suggestions. First, keep in mind that Hive doesn't care if you have a typo of some kind in your external location ;) Use DESCRIBE FORMATTED to verify the...
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Author: Dean Wampler,
2012-12-14, 15:22
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Re: Running commands at hive cli or hive thirft startup - Hive - [mail # user]
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...What about using "hive -i ~/.hiverc -f script"? I haven't tried it, but I assume it reads the specified "rc" file in the batch mode case. True? On Fri, Dec 14, 2012 at 3:41 AM, Mark Gr...
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Author: Dean Wampler,
2012-12-14, 14:31
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Re: Storing data in TSV with changing headers - Hive - [mail # user]
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...You'll have to define separate tables for the different schemas. You can "unify" them in a query with the union feature. You should also remove the header lines in the files, if you still ha...
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Author: Dean Wampler,
2012-11-30, 13:40
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Re: Starting with Hive - writing custom SerDe - Hive - [mail # user]
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...Similarly, Pig is pretty nice for this type of data cleansing and it's a little more flexible However, for completeness, I'll mention an alternative to writing a UDF; use the Hive stre...
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Author: Dean Wampler,
2012-11-29, 15:09
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