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Re: effect on data after topology change - Hadoop - [mail # user]
...Hi Ravi,  You'll probably need to up the replication level of the affected files and then drop it back down to the desired level. Current versions of HDFS do not automatically repair ra...
   Author: Todd Lipcon, 2012-01-17, 18:41
Re: hadoop filesystem cache - Hadoop - [mail # user]
...There is some work being done in this area by some folks over at UC Berkeley's AMP Lab in coordination with Facebook. I don't believe it has been published quite yet, but the title of the pr...
   Author: Todd Lipcon, 2012-01-16, 00:33
Re: NameNode - didn't persist the edit log - Hadoop - [mail # user]
...Hi Guy,  Eli has been looking into these issues and it looks like you found a nasty bug. You can follow these JIRAs to track resolution: HDFS-2701, HDFS-2702, HDFS-2703. I think in part...
   Author: Todd Lipcon, 2011-12-18, 01:18
Precommit builds broken? - Hadoop - [mail # dev]
...Seeing this in the precommit builds:  At revision 1215244. HDFS-2553 patch is being downloaded at Fri Dec 16 18:50:40 UTC 2011 from http://issues.apache.org/jira/secure/attachment/12506...
   Author: Todd Lipcon, 2011-12-17, 00:18
Re: HDFS Backup nodes - Hadoop - [mail # user]
...On Wed, Dec 14, 2011 at 10:00 AM, Scott Carey  wro te: e' ...> r  Currently our requirement is that we can have two client machines "mount" the storage, though only one needs to...
   Author: Todd Lipcon, 2011-12-14, 21:57
Re: MAX_FETCH_RETRIES_PER_MAP (TaskTracker dying?) - Hadoop - [mail # user]
...Hi Chris,  I'd suggest updating to a newer version of your hadoop distro - you're hitting some bugs that were fixed last summer. In particular, you're missing the "amendment" patch from...
   Author: Todd Lipcon, 2011-12-05, 21:05
Re: Compressor setInput input permanence - Hadoop - [mail # dev]
...Hi Tim,  My guess is that this contract isn't explicitly documented anywhere. But the good news is that the set of implementors and users of this API is fairly well contained.  I'd...
   Author: Todd Lipcon, 2011-12-05, 06:51
Re: Hadoop - non disk based sorting? - Hadoop - [mail # dev]
...I've seen this issue in jobs with many many map tasks and small reducer heaps. There is some heap space needed for the actual map completion events, etc, and that isn't accounted for in dete...
   Author: Todd Lipcon, 2011-12-01, 18:31
Re: Blocks are getting corrupted under very high load - Hadoop - [mail # dev]
...On Wed, Nov 23, 2011 at 1:23 AM, Uma Maheswara Rao G  wrote:  if it is not getting any CPU cycles ¬†for 480secs, it will reboot himself .  So sounds like the following happened...
   Author: Todd Lipcon, 2011-11-23, 23:37
Dropping CHANGES.txt? - Hadoop - [mail # dev]
...I was thinking... our use of CHANGES.txt is a bit silly - we basically maintain all of our changes in three places (a) JIRA fixVersion field, (b) CHANGES.txt, and (c) the SVN changelog. It s...
   Author: Todd Lipcon, 2011-11-21, 19:01
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