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Re: effect on data after topology change - Hadoop - [mail # user]
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...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...
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Author: Todd Lipcon,
2012-01-17, 18:41
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Re: hadoop filesystem cache - Hadoop - [mail # user]
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...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...
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Author: Todd Lipcon,
2012-01-16, 00:33
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Re: NameNode - didn't persist the edit log - Hadoop - [mail # user]
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...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...
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Author: Todd Lipcon,
2011-12-18, 01:18
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Precommit builds broken? - Hadoop - [mail # dev]
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...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...
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Author: Todd Lipcon,
2011-12-17, 00:18
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Re: NameNode - didn't persist the edit log - Hadoop - [mail # user]
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...Hi Guy, Several questions come to mind here: - What was the exact WARN level message you saw? - Did you have multiple dfs.name.dirs configured as recommended by most setup guides? - Di...
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Author: Todd Lipcon,
2011-12-15, 09:39
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Re: HDFS Backup nodes - Hadoop - [mail # user]
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...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...
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Author: Todd Lipcon,
2011-12-14, 21:57
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Re: HDFS Backup nodes - Hadoop - [mail # user]
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...On Tue, Dec 13, 2011 at 11:00 PM, M. C. Srivas wrote: in It's a good question - but one which has data relatively available. Reading from Flavio Junqueira's slides from the Hadoo...
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Author: Todd Lipcon,
2011-12-14, 07:39
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Re: HDFS Backup nodes - Hadoop - [mail # user]
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...On Tue, Dec 13, 2011 at 10:42 PM, M. C. Srivas wrote: Sure. If I run "dd if=/dev/zero of=foo" my laptop will "spiral to death" also. I think this is what you're referring to -- c...
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Author: Todd Lipcon,
2011-12-14, 07:25
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Re: HDFS Backup nodes - Hadoop - [mail # user]
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...On Sun, Dec 11, 2011 at 10:47 PM, M. C. Srivas wrote: he This is pure FUD. I've never seen a "garbage collection of death" ever in any NN with smaller than a 40GB heap, and...
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Author: Todd Lipcon,
2011-12-14, 02:19
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Re: MAX_FETCH_RETRIES_PER_MAP (TaskTracker dying?) - Hadoop - [mail # user]
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...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...
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Author: Todd Lipcon,
2011-12-05, 21:05
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