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Re: small files and number of mappers - Hadoop - [mail # user]
...On Tue, Nov 30, 2010 at 3:21 AM, Harsh J  wrote:  MultiFile and ConbinedInputFormats help. JVM Re-use helps.  The larger problem is that an average NameNode with 4GB ram will ...
   Author: Edward Capriolo, 2010-11-30, 18:27
Re: Caution using Hadoop 0.21 - Hadoop - [mail # user]
...On Sat, Nov 13, 2010 at 4:33 PM, Shi Yu  wrote:  At times we have been frustrated by rapidly changing API's  # 23 August, 2010: release 0.21.0 available # 26 February, 2010: r...
   Author: Edward Capriolo, 2010-11-14, 04:53
Re: 0.21 found interface but class was expected - Hadoop - [mail # user]
...On Sat, Nov 13, 2010 at 9:50 PM, Todd Lipcon  wrote: ons en f on, wer at e s an s  Cloudera and Yahoo have back ported the interesting security components and some enhancements int...
   Author: Edward Capriolo, 2010-11-14, 03:19
Re: Why hadoop is written in java? - Hadoop - [mail # user]
...On Tue, Oct 12, 2010 at 12:20 AM, Chris Dyer  wrote: te: c. hout read d. ther en k 148p1684291.html  Hate to say it this way... but yet another "java is slow compared to the equiva...
   Author: Edward Capriolo, 2010-10-13, 01:19
[expand - 1 more] - Re: hd fs -head? - Hadoop - [mail # user]
...On Mon, Sep 27, 2010 at 11:13 AM, Keith Wiley  wrote ou ent ven _______ ng       --  Homer Simpson _______  'hadoop dfs -cat' will output the file as it is read. head -5 will kill ...
   Author: Edward Capriolo, 2010-09-27, 20:46
[expand - 1 more] - Re: A new way to merge up those small files! - Hadoop - [mail # user]
...Ted,  Good point. Patches are welcome :) I will add it onto my to-do list.  Edward  On Sat, Sep 25, 2010 at 12:05 PM, Ted Yu  wrote:...
   Author: Edward Capriolo, 2010-09-27, 14:04
Re: Cannot run program "bash": java.io.IOException - Hadoop - [mail # user]
...This happens because child processes try to allocate the same memory as the parent. One way to solve this is setting memory overcommit to your linux system.  On Sat, Sep 18, 2010 at 4:4...
   Author: Edward Capriolo, 2010-09-18, 14:21
Re: How to disable secondary node - Hadoop - [mail # user]
...It is a bad idea to permanently disable 2nn. The edits file grows very very large and will not be processed until the name node restart. We had a 12GB edit file that took 40 minutes of downt...
   Author: Edward Capriolo, 2010-09-09, 14:59
Re: SequenceFile Header - Hadoop - [mail # user]
...On Wed, Sep 8, 2010 at 1:06 PM, Matthew John  wrote:  Are you trying to write sequence files by yourself? That is not the suggested way.  You should write your sequence files ...
   Author: Edward Capriolo, 2010-09-08, 17:26
Re: Re: namenode consume quite a lot of memory with only serveral hundredsof files in it - Hadoop - [mail # user]
...The fact that the memory is high is not necessarily a bad thing. Faster garbage collection implies more CPU usage.  I had some success following the tuning advice here, to make my memor...
   Author: Edward Capriolo, 2010-09-08, 01:34
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