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"JVM reuse": if I use this option, do setup(), cleanup() get called only once? - Hadoop - [mail # user]
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...Hi, This question might sound stupid, but I couldn't find a definite answer on Google. My job loads a big file at setup() in Map tasks. So I would like to use the loaded file again and...
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Author: edward choi,
2012-11-13, 08:17
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Is it okay to upgrade from CDH3U2 to hadoop 1.0.2 and hbase 0.92.1? - Hadoop - [mail # user]
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...Hi, I have used CDH3U2 for almost a year now. Since it is a quite old distribution, there are certain glitches that keep bothering me. So I was considering upgrading to Hadoop 1.0.3 and Hbas...
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Author: edward choi,
2012-05-22, 02:44
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Re: Is it possible to set how many map slots to use on each job submission? - Hadoop - [mail # user]
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...Thanks for the tip Harsh, Arun. What I was exactly looking for!! Regards, Ed 2012/1/18 Arun C Murthy ...
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Author: edward choi,
2012-01-20, 01:54
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Is it possible to set how many map slots to use on each job submission? - Hadoop - [mail # user]
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...Hi, I often run into situations like this: I am running a very heavy job(let's say job 1) on a hadoop cluster(which takes many hours). Then something comes up that needs to be done ver...
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Author: edward choi,
2012-01-18, 06:57
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Re: How to read LZO compressed files? - Hadoop - [mail # user]
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...Harsh, your comment just saved me from several wasteful hours of aimless labor. I added LzoCodec in core-site.xml. But I forgot to add LzopCodec. Now it works all good. Thanks for the reply!...
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Author: edward choi,
2012-01-02, 08:01
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Re: How to read LZO compressed files? - Hadoop - [mail # user]
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...Hi, The first solution is my final plan. There are so many lzo files, that manual decompression would take quite a while As you suggested, I have used LzoTextInputFormat but I ge...
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Author: edward choi,
2012-01-02, 07:22
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How to read LZO compressed files? - Hadoop - [mail # user]
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...Hi, I'm having trouble trying to handle lzo compressed files. The input files are compressed by LzopCodec provided by hadoop-lzo package. And I am using Cloudera 3 update 2 version Had...
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Author: edward choi,
2012-01-02, 05:34
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Does Hbase automatically restore data when regionservers fail? - Hadoop - [mail # user]
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...Hi, I am using CDH3U0 Hadoop and Hbase. I know that HDFS automatically replicates data to multiple data nodes so that when a couple of data nodes fail, the user won't lose any da...
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Author: edward choi,
2011-10-12, 09:34
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Re: Adjusting column value size. - Hadoop - [mail # user]
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...Yes, I need all of those ints at the same time. And no, there is no streaming. I have decided to pack 1024 ints into one cell so that each cell would be of size 4kb. I am already using...
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Author: edward choi,
2011-10-07, 14:24
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Adjusting column value size. - Hadoop - [mail # user]
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...Hi, I have a question regarding the performance and column value size. I need to store per row several million integers. ("Several million" is important here) I was wondering which met...
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Author: edward choi,
2011-10-04, 05:58
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