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HDFs file-create performance - MapReduce - [mail # user]
...Are there any rough numbers one can give me regarding the latency of creating, writing, and closing a small HDFS-based file?  Does replication have a big impact?  I am trying to de...
   Author: John Lilley, 2013-09-19, 12:40
RE: Scheduler question - MapReduce - [mail # user]
...Thanks!  That makes perfect sense. john  From: Sandy Ryza [mailto:[EMAIL PROTECTED]] Sent: Monday, September 09, 2013 4:17 AM To: [EMAIL PROTECTED] Subject: Re: Scheduler question ...
   Author: John Lilley, 2013-09-13, 12:22
[expand - 3 more] - RE: yarn-site.xml and aux-services - MapReduce - [mail # user]
...Harsh,  Thanks as usual for your sage advice.  I was hoping to avoid actually installing anything on individual Hadoop nodes and finessing the service by spawning it from a task us...
   Author: John Lilley, 2013-09-05, 18:11
HDFS blockIDs vs paths - MapReduce - [mail # user]
...In HDFS, who tracks the filesystem path on the datanode of each block?  The namenode or the datanode?  If datanode, where is that table stored? John  ...
   Author: John Lilley, 2013-07-18, 23:52
Accessing HDFS - MapReduce - [mail # user]
...I've seen mentioned that you can access HDFS via ClientProtocol, as in: ClientProtocol namenode = DFSClient.createNamenode(conf); LocatedBlocks lbs = namenode.getBlockLocations(path, start, ...
   Author: John Lilley, 2013-07-05, 18:10
RE: How to update a file which is in HDFS - MapReduce - [mail # user]
...Manickam,  HDFS supports append; it is the command-line client that does not. You can write a Java application that opens an HDFS-based file for append, and use that instead of the hado...
   Author: John Lilley, 2013-07-04, 21:35
RE: HDFS file section rewrite - MapReduce - [mail # user]
...I found this: https://issues.apache.org/jira/browse/HADOOP-5215 Doesn't seem to have attracted much interest. John   From: Suresh Srinivas [mailto:[EMAIL PROTECTED]] Sent: Tuesday, July...
   Author: John Lilley, 2013-07-02, 19:31
[expand - 2 more] - RE: YARN tasks and child processes - MapReduce - [mail # user]
...Thanks, that answers my question.  I am trying to explore alternatives to a YARN auxiliary service, but apparently this isn’t an option. John   From: Ravi Prakash [mailto:[EMAIL PR...
   Author: John Lilley, 2013-07-02, 19:06
RE: Business Analysts in Hadoop World - MapReduce - [mail # user]
...Hadoop is not yet an easy learning curve, so I'd recommend that you start with Amazon Elastic MapReduce as an experimental platform to start learning. John   From: Vijaya Narayana Reddy...
   Author: John Lilley, 2013-07-02, 18:53
RE: Exception in createBlockOutputStream - poss firewall issue - MapReduce - [mail # user]
...I don’t know the answer… but if it is possible to make the DNs report a domain-name instead of an IP quad it may help. John   From: Robin East [mailto:[EMAIL PROTECTED]] Sent: Thursday,...
   Author: John Lilley, 2013-07-02, 18:48
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