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Re: Mutiple dfs.data.dir vs RAID0 - HDFS - [mail # user]
...On Mon, Feb 11, 2013 at 10:54 AM, Jean-Marc Spaggiari  wrote:   "Hadoop Operations" by E. Sammer: http://shop.oreilly.com/product/0636920025085.do  ...
   Author: Michael Katzenellenbogen, 2013-02-11, 16:02
Re: Mutiple dfs.data.dir vs RAID0 - HDFS - [mail # user]
...One thought comes to mind: disk failure. In the event a disk goes bad, then with RAID0, you just lost your entire array. With JBOD, you lost one disk.  -Michael  On Feb 10, 2013, a...
   Author: Michael Katzenellenbogen, 2013-02-11, 02:12
Re: Confused about splitting - HDFS - [mail # user]
...Have your record reader seek (and discard data) until it finds the beginning of your frame, and always keep reading until the end/length of the current frame/record. This will assure you tha...
   Author: Michael Katzenellenbogen, 2013-02-10, 15:58
Re: Hadoop throughput question - HDFS - [mail # user]
...What is the value of the io.file.buffer.size property? Try tuning it up to 64k or 128k and see if this improves performance when reading SequenceFiles.  -Michael  On Jan 3, 2013, a...
   Author: Michael Katzenellenbogen, 2013-01-04, 00:27
Re: Hadoop throughput question - HDFS - [mail # user]
...Loaded question indeed.  How are you measuring that 30mb/s? Is that per machine / NIC? HDFS throughout? Some other metric?  -Michael  On Jan 3, 2013, at 5:01 PM, Artem Ervits ...
   Author: Michael Katzenellenbogen, 2013-01-03, 22:08
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