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Re: Hadoop Rack awareness on virtual system - MapReduce - [mail # user]
...An example topology file and script is available on the Wiki at http://wiki.apache.org/hadoop/topology_rack_awareness_scripts   On Thu, May 23, 2013 at 8:38 PM, Jitendra Yadav wrote: &n...
   Author: Harsh J, 2013-05-23, 15:30
Re: dncp_block_verification log - MapReduce - [mail # user]
...Hi,  What is your HDFS version? I vaguely remember this to be a problem in the 2.0.0 version or so where there was also a block scanner excessive work bug, but I'm not sure what fixed i...
   Author: Harsh J, 2013-05-23, 12:24
Re: How to handle multiline record for inputsplit? - MapReduce - [mail # dev]
...If your record is variably multi-line, then quite logically the newline character cannot be its "record delimiter". Use the right character or byte(s)/info that defines the real "record deli...
   Author: Harsh J, 2013-05-21, 06:28
Re: Pluggable Block placement policy - MapReduce - [mail # user]
...Hi Mohammad,  I believe we've already answered this earlier to an almost exact question: http://search-hadoop.com/m/b8FAa2eI6kj1. Does that not suffice? Is there something more specific...
   Author: Harsh J, 2013-05-20, 07:09
[expand - 1 more] - Re: recursive list in java without block - MapReduce - [mail # user]
...Hi Kun,  So I think I was incorrect as I only checked the 0.20/1.0 APIs.  We do have optimal recursive listing support in 2.0 for both FileContext and FileSystem APIs: http://hadoo...
   Author: Harsh J, 2013-05-17, 09:52
Re: Hadoop running the incorrect class - MapReduce - [mail # user]
...Check your "hadoop classpath" output - check on the output if your jar was placed on it directly.  Alternatively, use a tool such as https://github.com/mreid-moz/JarFinder, etc. to help...
   Author: Harsh J, 2013-05-16, 22:56
Re: Question about writing HDFS files - MapReduce - [mail # user]
...That is not true. HDFS writes are not staged to a local disk first before being written onto the DataNodes. The old architecture docs seem to suggest that the writes get staged to a local di...
   Author: Harsh J, 2013-05-16, 22:53
Re: Question on HDFS_BYTES_READ and HDFS_BYTES_WRITTEN - MapReduce - [mail # user]
...Hi Jim,  The counters you're looking at are counted at the FileSystem interface level, not at the more specific Task level (which have "map input bytes" and such).  This means that...
   Author: Harsh J, 2013-05-16, 07:56
[expand - 1 more] - Re: Map Tasks do not obey data locality principle........ - MapReduce - [mail # user]
...Hi Nikhil,  For (1) - Its hard to specifically tell what you may be doing wrong or differently than expected cause I don't have the source to look it up, but do you at least see the JT ...
   Author: Harsh J, 2013-05-16, 06:52
[expand - 1 more] - Re: Question about Name Spaces… - MapReduce - [mail # user]
...Do you see viewfs mounts coming useful there (i.e. in place of hardlinks across NSes)?  On Thu, May 16, 2013 at 3:49 AM, Michael Segel  wrote:    Harsh J...
   Author: Harsh J, 2013-05-16, 05:14
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