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RE: Performance Tunning - Hadoop - [mail # user]
... Matthew,  I understood that Juan was talking about a 2 socket quad core box.  We run  boxes with the e5500 (xeon quad core ) chips. Linux sees these as 16 cores.   ...
   Author: Michael Segel, 2011-06-28, 18:30
RE: Any reason Hadoop logs cant be directed to a separate filesystem? - Hadoop - [mail # user]
...Yes, and its called using cron and writing a simple ksh script to clear o ut any files that are older than 15 days.  There may be another way, but that's really the easiest.   stem...
   Author: Michael Segel, 2011-06-25, 10:58
[expand - 3 more] - RE: Why inter-rack communication in mapreduce slow? - Hadoop - [mail # user]
...We've looked at the network problem for the past two years.  10GBe is now a reality. Even a year ago prices were still at a premium.  Because you now have 10GBe and you have 2TB dr...
   Author: Michael Segel, 2011-06-07, 11:23
RE: Hadoop Cluster Multi-datacenter - Hadoop - [mail # user]
...PWC now getting in to Hadoop? Interesting....  Sanjeev, the simple short answer is that you don't create a cloud that sp ans a data center. Bad design. You build two clusters one per da...
   Author: Michael Segel, 2011-06-07, 11:11
[expand - 1 more] - RE: Cluster hard drive ratios - Hadoop - [mail # user]
...Hey!  Sorry my math is off. I keep thinking in terms of TB per core and not drive s. :-)  To be honest I don't know if I would recommend 6 core cpus.   We're running on what i...
   Author: Michael Segel, 2011-05-04, 19:19
[expand - 1 more] - RE: Anyone using layer 2 vlans in their cluster? - Hadoop - [mail # user]
... yes please.  I'm curious as to the impact on overall performance.   I would imagine that layer 2 traffic would take precedence over layer 3 tra ffic.  Thx  -Mike &n...
   Author: Michael Segel, 2011-05-02, 14:18
Would being able to track the time a task was active? - Hadoop - [mail # general]
...Ok,   Maybe I'm missing something, but when I look at my jobs running, I see  the job start time and then the end time of the specific task running.   Wouldn't it make sense t...
   Author: Michael Segel, 2011-04-19, 16:07
RE: Dynamic Data Sets - Hadoop - [mail # user]
...James,   If I understand you get a set of immutable attributes, then a state which  can change.   If you wanted to use HBase...  I'd say create a unique identifier for yo...
   Author: Michael Segel, 2011-04-14, 17:06
RE: does counters go the performance down seriously? - Hadoop - [mail # user]
...Looking at the blog: " Counters  Counters represent global counters, defined either by the Map/Reduce  framework or applications. Applications can define arbitrary Counters  a...
   Author: Michael Segel, 2011-03-29, 15:30
RE: live/dead node problem - Hadoop - [mail # user]
...Rita,  When the NameNode doesn't see a heartbeat for 10 minutes, it then recogni zes that the node is down.   Per the Hadoop online documentation: "Each DataNode sends a Heartbeat ...
   Author: Michael Segel, 2011-03-29, 15:24
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