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Re: Dell Hardware - HDFS - [mail # user]
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...We have tested both machines in our labs at MapR and both work well. Both run pretty hot so you need to keep a good eye on that. The R720 will have higher wattage per unit of sto...
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Author: Ted Dunning,
2013-01-31, 19:28
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Re: Estimating disk space requirements - HDFS - [mail # user]
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...It is usually better to not subdivide nodes into virtual nodes. You will generally get better performance form the original node because you only pay for the OS once and because your d...
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Author: Ted Dunning,
2013-01-18, 22:59
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Re: Hadoop Scalability - HDFS - [mail # user]
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...Also, you may have to adjust your algorithms. For instance, the conventional standard algorithm for SVD is a Lanczos iterative algorithm. Iteration in Hadoop is death because of ...
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Author: Ted Dunning,
2013-01-18, 15:45
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Re: What is the preferred way to pass a small number of configuration parameters to a mapper or reducer - HDFS - [mail # user]
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...Answer B sounds pathologically bad to me. A or C are the only viable options. Neither B nor D work. B fails because it would be extremely hard to get the right records to t...
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Author: Ted Dunning,
2012-12-28, 21:10
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Re: hadoop -put command - HDFS - [mail # user]
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...The colon is a reserved character in a URI according to RFC 3986[1]. You should be able to percent encode those colons as %3A. [1] http://tools.ietf.org/html/rfc3986 On We...
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Author: Ted Dunning,
2012-12-26, 21:35
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Re: What should I do with a 48-node cluster - HDFS - [mail # user]
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...The infiniband connection to the disk unit might help with the I/O issue. The memory is a bit tight, but should be possible to make it work. On Sat, Dec 22, 2012 at 5:11 PM, Edw...
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Author: Ted Dunning,
2012-12-23, 02:48
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Re: Alerting - HDFS - [mail # user]
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...Also, I think that Oozie allows for timeouts in job submission. That might answer your need. On Sat, Dec 22, 2012 at 2:08 PM, Ted Dunning wrote: ...
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Author: Ted Dunning,
2012-12-22, 22:12
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Re: Alerting - HDFS - [mail # user]
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...You can write a script to parse the Hadoop job list and send an alert. The trick of putting a retry into your workflow system is a nice one. If your program won't allow multiple ...
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Author: Ted Dunning,
2012-12-22, 22:08
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Re: Merging files - HDFS - [mail # user]
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...A pig script should work quite well. I also note that the file paths have maprfs in them. This implies that you are using MapR and could simply use the normal linux command cat t...
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Author: Ted Dunning,
2012-12-22, 22:05
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Re: Merging files - HDFS - [mail # user]
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...The technical term for this is "copying". You may have heard of it. It is a subject of such long technical standing that many do not consider it worthy of detailed documentation....
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Author: Ted Dunning,
2012-12-22, 19:24
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