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RE: Cluster hard drive ratios - Hadoop - [mail # user]
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...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...
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Author: Michael Segel,
2011-05-04, 19:19
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RE: Cluster hard drive ratios - Hadoop - [mail # user]
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... Hi Matt. I think you attended Ravi's presentation.... One of the reasons we used 4 drives per node is that our nodes are in 1U bo xes and you can only fit 4 3.5" SATA drive...
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Author: Michael Segel,
2011-05-04, 18:26
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RE: Anyone using layer 2 vlans in their cluster? - Hadoop - [mail # user]
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... 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...
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Author: Michael Segel,
2011-05-02, 14:18
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Anyone using layer 2 vlans in their cluster? - Hadoop - [mail # user]
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...Hi, This may be a bit esoteric but I was thinking about clusters and cluster gr owth within a machine room. It may not be possible to get contiguous rack space for a very large c...
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Author: Michael Segel,
2011-05-02, 14:03
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Would being able to track the time a task was active? - Hadoop - [mail # general]
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...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...
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Author: Michael Segel,
2011-04-19, 16:07
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RE: Dynamic Data Sets - Hadoop - [mail # user]
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...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...
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Author: Michael Segel,
2011-04-14, 17:06
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RE: does counters go the performance down seriously? - Hadoop - [mail # user]
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...Looking at the blog: " Counters Counters represent global counters, defined either by the Map/Reduce framework or applications. Applications can define arbitrary Counters a...
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Author: Michael Segel,
2011-03-29, 15:30
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RE: live/dead node problem - Hadoop - [mail # user]
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...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 ...
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Author: Michael Segel,
2011-03-29, 15:24
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RE: changing node's rack - Hadoop - [mail # user]
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...This may be weird, but I could have sworn that the script is called repea tedly. One simple test would be to change the rack aware script and print a messag e out when the script is called. ...
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Author: Michael Segel,
2011-03-28, 20:15
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RE: CDH and Hadoop - Hadoop - [mail # user]
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...Rita, It sounds like you're only using Hadoop and have no intentions to really ge t into the internals. I'm like most admins/developers/IT guys and I'm pretty lazy. I find it eas...
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Author: Michael Segel,
2011-03-23, 15:32
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