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Re: MapReduce on Local FileSystem - MapReduce - [mail # user]
...Then why not simply run with Write Replication Factor set to 1?  On Fri, May 31, 2013 at 12:54 PM, Agarwal, Nikhil  wrote:    Harsh J...
   Author: Harsh J, 2013-05-31, 07:25
Re: Reduce side question on MR - MapReduce - [mail # user]
...I don't see a direct question asked, but here's a condition in the source code you want to take a look at (*): https://github.com/apache/hadoop-common/blob/branch-1/src/mapred/org/apache/had...
   Author: Harsh J, 2013-05-30, 11:31
Re: NM/AM interaction - MapReduce - [mail # user]
...All AuxiliaryServices are configured in yarn-site.xml with a service ID and a class is associated to the defined service ID. For MR2, one generally adds the two below properties, first defin...
   Author: Harsh J, 2013-05-29, 02:24
Re: Mapreduce queues - MapReduce - [mail # user]
...Can you rephrase your question to include definitions of what you mean by 'queues' and what you mean by 'clusters'?  On Wed, May 22, 2013 at 7:22 PM, Pedro Sá da Costa  wrote: &nbs...
   Author: Harsh J, 2013-05-27, 07:36
Re: HTTP file server, map output, and other files - MapReduce - [mail # user]
...YARN has a ShuffleHandler plugin used for MR purposes, but the APIs used here aren't "general"/public so you'd have to build your own utilities to do that. Its not too difficult to achieve b...
   Author: Harsh J, 2013-05-24, 06:43
Re: Hadoop 2.0.4: Unable to load native-hadoop library for your platform - MapReduce - [mail # user]
...The native libraries packed in a binary tarball of 2.0.4 may not apply to all OSes and architectures. You will need to build your own native libraries to make sure they are appropriate for y...
   Author: Harsh J, 2013-05-24, 06:24
Re: pauses during startup (maybe network related?) - MapReduce - [mail # user]
...You are spot on about the DNS lookup slowing things down. I've faced the same issue (before I had a local network DNS set up for the WiFi network I use).   There's a few configs you nee...
   Author: Harsh J, 2013-05-24, 05:29
Re: Task attempt failed after TaskAttemptListenerImpl ping - MapReduce - [mail # user]
...Assuming you mean "failed" there instead of "filed".  In MR, a ping message is sent over the TaskUmbilicalProtocol from the Task container to the MR AM. A ping is only sent as an altern...
   Author: Harsh J, 2013-05-24, 05:24
Re: SequenceFile sync marker uniqueness - MapReduce - [mail # user]
...SequenceFiles use a 16 digit MD5 (computed based on a UID and writer ~init time, so pretty random). For the rest of my answer, I'll prefer not to repeat what Martin's already said very well ...
   Author: Harsh J, 2013-05-23, 19:53
Re: HDFS data and non-aligned splits - MapReduce - [mail # user]
...on block boundaries?  Answer depends on the file format used here. With any of the formats we ship, nothing happens.  boundaries, resulting in an extra HDFS connection just to get ...
   Author: Harsh J, 2013-05-23, 19:09
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