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Re: how to find top N values using map-reduce ? - Hadoop - [mail # user]
...Hi,  Can you tell more about:  * How big is N  * How big is the input dataset  * How many mappers you have  * Do input splits correlate with the sorting criterion fo...
   Author: Eugene Kirpichov, 2013-02-02, 06:23
Re: Analysis of Log Files - Hadoop - [mail # user]
...Well, then you can simply do it like this: Map: emit key=product_id value=date Reduce for a particular product_id: manually count (in a hashtable) dates and their counts, return the date wit...
[+ more]    Author: Eugene Kirpichov, 2012-07-03, 23:18
Re: execute millions of "grep" - Hadoop - [mail # user]
...Hi,  Hm - I was not assuming that you'll have >20mln queries. However, you can partition the query space into as many parts as needed to fit each part in memory, and accordingly incr...
[+ more]    Author: Eugene Kirpichov, 2011-11-03, 12:16
Re: data locality - Hadoop - [mail # user]
...Thanks!  2011/10/26 Steve Loughran :    Eugene Kirpichov Principal Engineer, Mirantis Inc. http://www.mirantis.com/ Editor, http://fprog.ru/...
[+ more]    Author: Eugene Kirpichov, 2011-10-26, 09:22
Re: Hbase + mapreduce -- operational design question - Hadoop - [mail # user]
...I believe HBase has some kind of TTL (timeout-based expiry) for records and it can clean them up on its own.  On Sat, Sep 10, 2011 at 1:54 AM, Dhodapkar, Chinmay  wrote: . Also, pe...
   Author: Eugene Kirpichov, 2011-09-10, 09:23
Re: HBase and HDFS sync support in the main branch - Hadoop - [mail # user]
...Hello Arun,  Thanks for the clarification. Do you mean 0.20.205 will be a "default" (main, trunk, you name it) release and have durable edits?  On Fri, Sep 9, 2011 at 2:22 PM, Arun...
[+ more]    Author: Eugene Kirpichov, 2011-09-09, 18:42
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