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Re: keeping an active hdfs cluster balanced - HDFS - [mail # user]
...On Mar 17, 2011, at 12:13 PM, Stuart Smith wrote:  here. My basic problem is: does put a bit of pressure on the system (when balanced, every DN is  more than half full).   Usu...
   Author: Allen Wittenauer, 2011-03-17, 21:20
Re: Changing a Namenode server - HDFS - [mail # user]
...On Mar 16, 2011, at 7:17 AM, Lior Schachter wrote:  the system     It is pretty much the same procedure as if you had perm. lost  the NN hardware, more or less:  1) ...
   Author: Allen Wittenauer, 2011-03-16, 14:30
Re: how does hdfs determine what node to use? - HDFS - [mail # user]
...On Mar 10, 2011, at 10:34 AM, Jeffrey Buell wrote:  per rack do you have? having greater replication in the shuffle or reduce phases?  That is, is  hadoop smart enough that wh...
   Author: Allen Wittenauer, 2011-03-14, 16:28
Re: Will blocks of an unclosed file get lost when HDFS client (or the HDFS cluster) crashes? - HDFS - [mail # user]
...No.   If a close hasn't been committed to the file, the associated  blocks/files disappear in both client crash and namenode crash  scenarios.     On Mar 13, 2011, a...
   Author: Allen Wittenauer, 2011-03-14, 16:21
[expand - 2 more] - Re: HDFS drive, partition best practice - HDFS - [mail # user]
...On Feb 8, 2011, at 12:22 PM, Patrick Angeles wrote:  s   I keep ignoring their requests to come interview, so that might have somet hing to do with it. Hmm....
   Author: Allen Wittenauer, 2011-02-08, 20:43
Re: Altering logical rack configuration - HDFS - [mail # user]
...On Feb 4, 2011, at 5:00 PM, Jonathan Disher wrote:  no longer here) did not specify logical racks in the HDFS configuration, in stead leaving everything in "default-rack".  Now I h...
   Author: Allen Wittenauer, 2011-02-08, 18:47
[expand - 1 more] - Re: changing the block size - HDFS - [mail # user]
...On Feb 6, 2011, at 2:24 PM, Rita wrote: ead   Right.   As previously mentioned, changing the block size does not change the block s of the previously written files.  In other...
   Author: Allen Wittenauer, 2011-02-08, 00:16
Re: help:2 problems in using hadoop sequencefile - HDFS - [mail # dev]
...On Jan 18, 2011, at 6:15 PM, 张春玮 wrote:   There is no working append code in any released version of Apache Hadoop 0.20.2.  So you'll need to read all the files with an identity ma...
   Author: Allen Wittenauer, 2011-02-04, 02:20
Re: Use VIP for DataNodes - HDFS - [mail # dev]
...FWIW, Y! and LI (and I'm sure others) have been using failover A records f or years.  The only known problem/limitation is exactly what Dhruba states.  On Jan 29, 2011, at 11:19 PM...
   Author: Allen Wittenauer, 2011-01-31, 20:22
[expand - 1 more] - Re: TestDFSIO on Lustre vs HDFS - HDFS - [mail # user]
...On Jan 28, 2011, at 10:39 AM, Nathan Rutman wrote: ntity, the reliability, scalabilty, heterogenicity (sic), data access patte rn, applications you're using, performance requirements, and sy...
   Author: Allen Wittenauer, 2011-01-29, 06:35
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