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Re: Lost tasktracker errors - Hadoop - [mail # general]
...Hi,  I think this issue looks like the jobtracker is running out of RAM, too. "Lost task tracker" is indicative of what I call the "million mapper march". Lots of tasks running per user...
   Author: Jeff Bean, 2013-01-07, 21:03
Re: Fixing Mis-replicated blocks - Hadoop - [mail # user]
...Do setrep -w on the increase to force the new replica before decreasing again.  Of course, the little script only works if the replication factor is 3 on all the files. If it's a variab...
   Author: Jeff Bean, 2011-10-21, 00:26
Re: [VOTE] Powered by Logo - Hadoop - [mail # general]
...5,6,2,4,3,1  On Thu, Jun 16, 2011 at 1:27 PM, Eric Baldeschwieler wrote:  ...
   Author: Jeff Bean, 2011-06-16, 21:12
Re: When does Reduce job start - Hadoop - [mail # user]
...It's part of the design that reduce() does not get called until the map phase is complete. You're seeing reduce report as started when map is at 90% complete because hadoop is shuffling data...
   Author: Jeff Bean, 2011-01-04, 23:14
Re: MapFiles error "Could not obtain block" - Hadoop - [mail # user]
...Hi Kim,  I saw this problem once, turned out the block was getting deleted before it was read. Check namenode for blk_-7027776556206952935_61338. What's the story there?  Jeff &nbs...
   Author: Jeff Bean, 2010-11-19, 00:14
Re: Hadoop and XML - Hadoop - [mail # general]
...data.length is the length of the byte array.  Text.getLength() most likely returns a different value than getBytes.length.  Hadoop reuses box class objects like Text, so what it's ...
   Author: Jeff Bean, 2010-07-20, 16:23
Re: string conversion problems - Hadoop - [mail # user]
...Whitespace characters are funny. You showed me this code in the mapper:  String [] tokens = line.split("    ");  Which doesn't actually match for tab, which would be line...
   Author: Jeff Bean, 2010-07-16, 20:33
Re: calling C programs from Hadoop - Hadoop - [mail # user]
...Hi Michael,  Why did you determine that Hadoop streaming was insufficient for you?  Jeff  On Mon, May 31, 2010 at 9:17 AM, Michael Robinson wrote:  ...
   Author: Jeff Bean, 2010-05-31, 16:24
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