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HTTP file server, map output, and other files - MapReduce - [mail # user]
...Thanks to previous kind answers and more reading in the elephant book, I now understand that mapper tasks place partitioned results into local files that are served up to reducers via HTTP: ...
   Author: John Lilley, 2013-05-23, 21:44
SequenceFile sync marker uniqueness - MapReduce - [mail # user]
...How does SequenceFile guarantee that the sync marker does not appear in the data? John  ...
   Author: John Lilley, 2013-05-23, 18:04
[expand - 1 more] - RE: HDFS data and non-aligned splits - MapReduce - [mail # user]
...Related to this, I see in the elephant book under "Which compression format should I use": "Use a container file format such as Sequence File..." Does Sequence File attempt to align compress...
   Author: John Lilley, 2013-05-23, 17:59
splittable vs seekable compressed formats - MapReduce - [mail # user]
...I've read about splittable compressed formats in Hadoop.  Are any of these formats also "seekable" (in other words, be able to seek to an absolute location in the uncompressed data). Jo...
   Author: John Lilley, 2013-05-23, 17:31
RE: YARN in 2.0 and 0.23 - MapReduce - [mail # user]
...We don't necessarily have the freedom to choose; we are an application provider and we desire compatibility for as many versions as possible so as to fit into existing Hadoop installations. ...
   Author: John Lilley, 2013-05-23, 00:51
RE: Shuffle phase - MapReduce - [mail # user]
...I was reading the elephant book trying to understand which process actually serves up the HTTP transfer on the mapper side.  Is it the each map task?  Or is there some persistent t...
   Author: John Lilley, 2013-05-22, 14:58
[expand - 2 more] - RE: Shuffle phase replication factor - MapReduce - [mail # user]
...Ummmm, is that also the limit for the number of simultaneous connections?  In general, one does not need a 1:1 map between threads and connections. If this is the connection limit, does...
   Author: John Lilley, 2013-05-22, 14:57
[expand - 1 more] - RE: MapReduce shuffle algorithm - MapReduce - [mail # user]
...Thanks!  I will read the elephant book more thoroughly. john  From: Bertrand Dechoux [mailto:[EMAIL PROTECTED]] Sent: Tuesday, May 21, 2013 1:22 PM To: [EMAIL PROTECTED] Subject: R...
   Author: John Lilley, 2013-05-22, 14:34
HDFS append overhead - MapReduce - [mail # user]
...I am trying to determine if it is feasible for multiple nodes to alternate appends to a shared file in HDFS. Can someone tell me, what is the overhead of an open/append/close cycle? If multi...
   Author: John Lilley, 2013-05-21, 18:52
RE: which hadoop version to use - MapReduce - [mail # user]
...Have you looked at HDP for Windows? http://hortonworks.com/download/ It is a 1.1-based distro and is designed for easier Windows install.  I haven't used it myself. john  From: Che...
   Author: John Lilley, 2013-05-17, 23:49
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