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Re: number of buckets in bucket map join - Hive - [mail # dev]
...Hi Mahsa, Just to elaborate a little further. Bucket joins are quicker than regular joins because they lessen the number of logical multiplications that need to happen between the records fr...
   Author: Mark Grover, 2012-11-01, 14:49
Re: need help on writing hive query - Hive - [mail # user]
...You should look into Hive's cluster by/distribute by functionality.  https://cwiki.apache.org/Hive/languagemanual-sortby.html#LanguageManualSortBy-SyntaxofClusterByandDistributeBy https...
   Author: Mark Grover, 2012-10-31, 21:29
Re: A question about HiveStatement.executeUpdate's exception - Hive - [mail # user]
...Hi Liyifan, This seems like a bug. As a workaround, I would recommend using HiveStatement.executeQuery() instead (since they both call execute() on the Thrift client).  There is a JIRA ...
   Author: Mark Grover, 2012-08-31, 15:50
Re: How to Decide How Many Buckets to Use? - Hive - [mail # user]
...Hi Xun, Here is an answer I had given earlier on the mailing list. See if that helps.  http://mail-archives.apache.org/mod_mbox/hive-user/201204.mbox/%[EMAIL PROTECTED]%3E  Mark &n...
   Author: Mark Grover, 2012-07-11, 13:18
Re: Thrift Server - Hive - [mail # user]
...Hi Ransom, JDBC talks to the Hive driver via the Hive Thrift server. Since the thrift  server is limited to single connection at a time, out of curiosity, how muc h benefit do concurren...
   Author: Mark Grover, 2012-07-06, 03:47
Re: Hive insert into - Hive - [mail # user]
...Abhi, Bejoy is right. To add to the remark, "insert into" doesn't work on buckete d tables as of now. For non-bucketed tables, it should work if you are usin g Hive version 0.8 or higher. &n...
   Author: Mark Grover, 2012-07-06, 03:35
Re: count of distinct FROM multiple columns - Hive - [mail # user]
...A solution that comes to my mind is to use a union. Something like (unteste d):  select    first,    count(distinct second) from    (select     &...
   Author: Mark Grover, 2012-06-22, 17:29
[expand - 1 more] - Re: UDTF fails when used in LATERAL VIEW - Hive - [mail # user]
...Hi Jan, Yeah, you are right, initialize has to use the correct ObjectInspector.  Here is a blog post I am in process of writing on how to write a UDF:  http://mark.thegrovers.ca/1/...
   Author: Mark Grover, 2012-06-22, 13:53
Re: Text file with ctrl chat as delimiter - Hive - [mail # user]
...Sam, If you can please post a row or two of your data along with any errors you are getting, that would be helpful.  Mark From: "Mapred Learn"  To: [EMAIL PROTECTED] Cc: [EMAIL PRO...
   Author: Mark Grover, 2012-06-20, 13:24
[expand - 2 more] - Re: create external table on existing hive partitioned table ? - Hive - [mail # user]
...In hindsight, I have learned to create external tables so if I get into a situation like this, I don't have to look up the appropriate alter table statment (if it exists at all), I can just ...
   Author: Mark Grover, 2012-06-19, 23:00
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NEW: Monitor These Apps!
elasticsearch, apache solr, apache hbase, hadoop, redis, casssandra, amazon cloudwatch, mysql, memcached, apache kafka, apache zookeeper, apache storm, ubuntu, centOS, red hat, debian, puppet labs, java, senseiDB