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"JVM reuse": if I use this option, do setup(), cleanup() get called only once? - Hadoop - [mail # user]
...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...
   Author: edward choi, 2012-11-13, 08:17
Is it okay to upgrade from CDH3U2 to hadoop 1.0.2 and hbase 0.92.1? - Hadoop - [mail # user]
...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...
   Author: edward choi, 2012-05-22, 02:44
[expand - 1 more] - Re: Is it possible to set how many map slots to use on each job submission? - Hadoop - [mail # user]
...Thanks for the tip Harsh, Arun. What I was exactly looking for!!  Regards, Ed  2012/1/18 Arun C Murthy  ...
   Author: edward choi, 2012-01-20, 01:54
[expand - 2 more] - Re: How to read LZO compressed files? - Hadoop - [mail # user]
...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!...
   Author: edward choi, 2012-01-02, 08:01
Does Hbase automatically restore data when regionservers fail? - Hadoop - [mail # user]
...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...
   Author: edward choi, 2011-10-12, 09:34
[expand - 1 more] - Re: Adjusting column value size. - Hadoop - [mail # user]
...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...
   Author: edward choi, 2011-10-07, 14:24
Why use "Reverse Timestamp" as the Row Key? - Hadoop - [mail # user]
...Hi, I was studying Hbase with "Hadoop: The Definitive Guide". There was a schema example that had as the row key, "Group Id + Reverse Timestamp." This way the same groups will be located nea...
   Author: edward choi, 2011-07-22, 07:18
TableOutputFormat not efficient than direct HBase API calls? - Hadoop - [mail # user]
...Hi,  I am writing an Hadoop application that uses HBase as both source and sink.  There is no reducer job in my application.  I am using TableOutputFormat as the OutputFormatC...
   Author: edward choi, 2011-06-22, 02:22
[expand - 1 more] - Re: Custom TableInputFormat not working correctly - Hadoop - [mail # user]
...Hello, St.Ack  I found the reason at last on 3:00 am last night. org.apache.hadoop.hbase.mapreduce.TableMapReduceUtil.initTableMapperJob() is hardcoded to select "TableInputFormat.class...
   Author: edward choi, 2011-06-21, 00:10
How to split a specified number of rows per Map - Hadoop - [mail # user]
...Hi,  I am using HBase as a source of my MapReduce jobs.  I recently found out that TableInputFormat automatically splits the input table so that each region of the table will be as...
   Author: edward choi, 2011-06-05, 11:04
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