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Recovering the namenode from failure - Hadoop - [mail # user]
...I'm on CDH4, and trying to recover both the namenode and cloudera manager VMs from HDFS after losing the namenode.     All of our backup VMs are on HDFS, so for the moment I just w...
   Author: David Parks, 2013-05-21, 07:30
RE: About configuring cluster setup - Hadoop - [mail # user]
...We have a box that's a bit overpowered for just running our namenode and jobtracker on a 10-node cluster and we also wanted to make use of the storage and processor resources of that node, l...
   Author: David Parks, 2013-05-15, 07:50
Using FairScheduler to limit # of tasks - Hadoop - [mail # user]
...Can I use the FairScheduler to limit the number of map/reduce tasks directly from the job configuration? E.g. I have 1 job that I know should run a more limited # of map/reduce tasks than is...
   Author: David Parks, 2013-05-13, 11:21
[HADOOP-9295] AbstractMapWritable throws exception when calling readFields() multiple times when the maps contain different class types - Hadoop - [issue]
...Verified the trunk looks the same as 1.0.3 for this issue.When mappers output MapWritables with different class types, then they are read in on the Reducer via an iterator (multiple calls to...
http://issues.apache.org/jira/browse/HADOOP-9295    Author: David Parks, 2013-04-15, 19:07
RE: Which hadoop installation should I use on ubuntu server? - Hadoop - [mail # user]
...I’ve never used the Cloudera distributions, but you can’t not hear about them. Is it really much easier to manage the whole platform using clouderas manager?   50 nodes free is generous...
   Author: David Parks, 2013-03-29, 08:54
RE: For a new installation: use the BackupNode or the CheckPointNode? - Hadoop - [mail # user]
...Thanks for the update, I understand now that I'll be installing a "secondary name node" which performs checkpoints on the primary name node and keeps a working backup copy of the fsimage fil...
   Author: David Parks, 2013-03-27, 03:28
[expand - 1 more] - Re: Unexpected Hadoop behavior: map task re-running after reducer has been running - Hadoop - [mail # user]
...I should have included the obvious log files here.   Task attempt_201303080219_0002_r_005846_0 failed to report status for 7201 seconds. Killing! Task attempt_201303080219_0002_r_005857...
   Author: David Parks, 2013-03-11, 08:30
File does not exist on part-r-00000 file after reducer runs - Hadoop - [mail # user]
...Are there any rules against writing results to Reducer.Context while in the cleanup() method?     I’ve got a reducer that is downloading a few 10’s of millions of images from a set...
   Author: David Parks, 2013-02-11, 06:02
RE: Question related to Decompressor interface - Hadoop - [mail # user]
...I can't answer your question about the Decompressor interface, but I have a query for you.     Why not just create an EncryptedWritable object? Encrypt/decrypt the bytes on the rea...
   Author: David Parks, 2013-02-10, 02:36
[HADOOP-9262] Allow jobs to override the input Key/Value read from a sequence file's headers - Hadoop - [issue]
...There's no clean way to upgrade a sequence file when the model objects in an existing sequence file change in the development process.If we could override the Key/Value class types read from...
http://issues.apache.org/jira/browse/HADOOP-9262    Author: David Parks, 2013-01-30, 02:28
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