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Re: Low latency data access Vs High throughput of data - MapReduce - [mail # user]
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...I'll take a swing at this one. Low latency data access: I hit the enter key (or submit button) and I expect results within seconds at most. My database query time should be...
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Author: Chris Embree,
2013-05-20, 17:51
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Re: About configuring cluster setup - MapReduce - [mail # user]
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...It's not a good idea for anything more than Proof of Concept or Sandbox clusters. On Tue, May 14, 2013 at 3:10 AM, Leonid Fedotov wrote: ...
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Author: Chris Embree,
2013-05-14, 12:36
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Re: Rack Aware Hadoop cluster - MapReduce - [mail # user]
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...Here is a sample I stole from the web and modified slightly... I think. HADOOP_CONF=/etc/hadoop/conf while [ $# -gt 0 ] ; do nodeArg=$1 exec wrote: ...
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Author: Chris Embree,
2013-05-08, 20:49
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Re: Rack Aware Hadoop cluster - MapReduce - [mail # user]
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...Your script has an error in it. Please test your script using both IP Addresses and Names, outside of hadoop. On Wed, May 8, 2013 at 10:01 AM, Mohammad Mustaqeem wrote: ...
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Author: Chris Embree,
2013-05-08, 14:11
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Re: Rack Aware Hadoop cluster - MapReduce - [mail # user]
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...Finally, one I can answer. :) That should be in core-site.xml (unless it's moved from ver 1.x). It needs to be in the configuration for NameNode(s) and JobTracker (Yarn). I...
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Author: Chris Embree,
2013-05-08, 13:52
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Re: Run multiple HDFS instances - MapReduce - [mail # user]
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...Glad you got this working... can you explain your use case a little? I'm trying to understand why you might want to do that. On Thu, Apr 18, 2013 at 11:29 AM, Lixiang Ao ...
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Author: Chris Embree,
2013-04-18, 15:52
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Re: Cluster lost IP addresses - MapReduce - [mail # user]
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...Hey John, Make sure your /etc/hosts ( or DNS) is up to date and any topology scripts are updated. Unfortunately, NN is pretty dumb about IP's vs. Hostnames. BTW, NN d...
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Author: Chris Embree,
2013-03-23, 05:22
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Topology script frequency - MapReduce - [mail # user]
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...I've checked all of the documentation, books and google searches I can think of.... I have a working topology script. I have dynamic IP's. I have an automated process to up...
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Author: Chris Embree,
2013-02-20, 20:17
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Re: How to add users in supergroup? - MapReduce - [mail # user]
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...Check your HDFS config file for the groupname you used as HDFS supergroup. We used hdfs as the group name in our case. Then just groupadd hdfs (see man groupadd for additio...
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Author: Chris Embree,
2013-02-14, 16:55
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Re: Mutiple dfs.data.dir vs RAID0 - MapReduce - [mail # user]
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...Interesting question. You'd probably need to benchmark to prove it out. I'm not the exact details of how HDFS stripes data, but it should compare pretty well to hardware RAID. &n...
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Author: Chris Embree,
2013-02-11, 02:22
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