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Re: Metastore question - Hive - [mail # user]
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...Yes, the property name is misleading. The DATA is stored under that directory (for managed tables, as opposed to external tables where you explicit tell Hive the location). The METADATA is s...
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Author: Dean Wampler,
2013-04-04, 00:30
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Re: Bucketing external tables - Hive - [mail # user]
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...The table can be external. You should be able to use this data with other tools, because all bucketing does is ensure that all occurrences for records with a given key are written into the s...
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Author: Dean Wampler,
2013-03-31, 00:00
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Re: Bucketing external tables - Hive - [mail # user]
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...I don't know of any way to avoid creating new tables and moving the data. In fact, that's the official way to do it, from a temp table to the final table, so Hive can ensure the bucketing is...
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Author: Dean Wampler,
2013-03-29, 22:57
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Re: Noob question on creating tables - Hive - [mail # user]
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...That's a drawback of external tables, but it's actually not as difficult as it sounds. It's easy to write a nightly "cron" job that creates the partition for the next day (or a job per month...
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Author: Dean Wampler,
2013-03-29, 18:37
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Re: Noob question on creating tables - Hive - [mail # user]
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...On Fri, Mar 29, 2013 at 12:19 PM, Mark wrote: create external table foo (...) partitioned by (year int, month int, day int); ... - How can we tell Hive to partition ...
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Author: Dean Wampler,
2013-03-29, 17:32
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Re: Using TABLESAMPLE on inner queries - Hive - [mail # user]
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...Mark, Aside from what might be wrong here, isn't it true that sampling with the bucket clause still works on non-bucketed tables; it's just inefficient because it still scans the whole...
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Author: Dean Wampler,
2013-03-20, 19:20
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Re: Hive 0.10.0 metastore thrift server installation error - Hive - [mail # user]
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...You have to upgrade the existing metastore, although I'm not sure this is the cause. Did you do that? See the README in the Hive installation directory and scripts to do the upgrade in...
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Author: Dean Wampler,
2013-03-14, 12:42
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Re: UDFs and Thread Safety? - Hive - [mail # user]
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...Hadoop tasks use a single thread, so there won't be multiple threads accessing the UDF. However, there's a flip side of thread safety if your UDF maintains state; is it receiving all t...
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Author: Dean Wampler,
2013-03-11, 03:54
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Re: Error while table creation - Hive - [mail # user]
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...If you upgrade Hive, you have to do a upgrade/migration on the metastore database. There are scripts that come with hive distributions for this. If you're starting from scratch, you could ju...
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Author: Dean Wampler,
2013-03-10, 15:17
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Re: Hive query started map task being killed during execution - Hive - [mail # user]
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...Do you have more than one hive process running? It looks like you're using Derby, which only supports one process at a time. Also, you have to start Hive from the same directory every time, ...
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Author: Dean Wampler,
2013-03-08, 22:16
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