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Re: ~ Replacement for MapReduceBase ~ - Hadoop - [mail # user]
...Naga,  That's right. In the old API, Mapper and Reducer were just interfaces and didn't provide default implementations of their code. Thus MapReduceBase. Now Mapper and Reducer are cla...
   Author: Aaron Kimball, 2009-08-10, 17:53
Re: Maps running - how to increase? - Hadoop - [mail # user]
...I don't know that your load-in speed is going to dramatically increase. There's a number of parameters that adjust aspects of MapReduce, but HDFS more or less works out of the box. You shoul...
   Author: Aaron Kimball, 2009-08-06, 20:45
Re: Help in running hadoop from eclipse - Hadoop - [mail # user]
...May I ask why you're trying to run the NameNode in Eclipse? This is likely going to cause you lots of classpath headaches. I think your current problem is that it can't find its config files...
   Author: Aaron Kimball, 2009-08-06, 18:09
Re: namenode -upgrade problem - Hadoop - [mail # user]
...The only time you would need to upgrade is if you've increased the Hadoop version but are retaining the same HDFS :) So, that's the normal case.  What does "netstat --listening --numeri...
   Author: Aaron Kimball, 2009-08-05, 19:21
Re: how to dump data from a mysql cluster to hdfs? - Hadoop - [mail # user]
...mysqldump to local files on all 50 nodes, scp them to datanodes, and then bin/hadoop fs -put? - Aaron  On Mon, Aug 3, 2009 at 8:15 PM, Min Zhou  wrote:  ...
   Author: Aaron Kimball, 2009-08-05, 17:27
Re: questions about HDFS file access synchronization - Hadoop - [mail # user]
...On Wed, Aug 5, 2009 at 6:09 AM, Zhang Bingjun (Eddy) wrote:    There is no sync() call in HDFS. A will read whatever portion of B's data has already been committed to disk by the d...
   Author: Aaron Kimball, 2009-08-05, 17:22
Re: how to get out of Safe Mode? - Hadoop - [mail # user]
...For future reference, $ bin/hadoop dfsadmin safemode -leave will also just cause HDFS to exit safemode forcibly.  - Aaron  On Wed, Aug 5, 2009 at 1:04 AM, Amandeep Khurana  wr...
   Author: Aaron Kimball, 2009-08-05, 17:18
Re: A few questions about Hadoop and hard-drive failure handling. - Hadoop - [mail # user]
...On Fri, Jul 24, 2009 at 6:48 AM, Steve Loughran  wrote:   +1!  ...
   Author: Aaron Kimball, 2009-07-24, 18:02
Re: DiskChecker$DiskErrorException in TT logs - Hadoop - [mail # user]
...Amandeep,  Does the job fail after that happens? Are there any WARN or ERROR lines in the log nearby, or any exceptions?  Three possibilities I can think of:  You may have con...
   Author: Aaron Kimball, 2009-07-24, 18:00
Re: hdfs question when replacing dead node... - Hadoop - [mail # user]
...How fast did you re-run fsck after re-joining the node? fsck returns data based on the latest block reports from datanodes -- these are scheduled to run (I think) every 15 minutes, so the Na...
   Author: Aaron Kimball, 2009-07-24, 02:21
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