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Re: Fair Scheduler of Hadoop - MapReduce - [mail # user]
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...Hi Joep, Excellent answer! I think you have answered my confusions. And one remaining issue after reading this document again, even it is old. :-) It is mentioned, "which will al...
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Author: Lin Ma,
2013-01-21, 17:30
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Fair Scheduler of Hadoop - MapReduce - [mail # user]
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...Hi guys, I have a quick question regarding to fire scheduler of Hadoop, I am reading this article => http://blog.cloudera.com/blog/2008/11/job-scheduling-in-hadoop/, my question is ...
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Author: Lin Ma,
2013-01-20, 14:25
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Re: distributed cache - MapReduce - [mail # user]
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...Thanks Harsh, multiple concurrent read is generally faster or? regards, Lin On Wed, Dec 26, 2012 at 6:21 PM, Harsh J wrote: ...
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Author: Lin Ma,
2012-12-26, 10:43
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reducer tasks start time issue - MapReduce - [mail # user]
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...Hi guys, Supposing in a Hadoop job, there are both mappers and reducers. My question is, reducer tasks cannot begin until all mapper tasks complete? If so, why designed in this way? &n...
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Author: Lin Ma,
2012-12-22, 13:25
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Re: distributed cache - MapReduce - [mail # user]
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...Hi Kai, Smart answer! :-) - The assumption you have is one distributed cache replica could only serve one download session for tasktracker node (this is why ...
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Author: Lin Ma,
2012-12-22, 13:24
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Re: distributed cache - MapReduce - [mail # user]
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...Thanks Kai, using higher replication count for the purpose of? regards, Lin On Sat, Dec 22, 2012 at 8:44 PM, Kai Voigt wrote: ...
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Author: Lin Ma,
2012-12-22, 12:46
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distributed cache - MapReduce - [mail # user]
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...Hi guys, I want to confirm when on each task node either mapper or reducer access distributed cache file, it resides on disk, not resides in memory. Just want to make sure distributed ...
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Author: Lin Ma,
2012-12-22, 12:03
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Re: One mapper/reducer runs on a single JVM - MapReduce - [mail # user]
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...Thanks Mike. 1. So I think you mean for Hadoop, since it is batch job latency is not the most key concern, so time spent on swap is acceptable. But for HBase, the normal use case is on...
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Author: Lin Ma,
2012-11-07, 12:32
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Re: One mapper/reducer runs on a single JVM - MapReduce - [mail # user]
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...Thanks Michael, "If you are running just Hadoop, you could have a little swap. Running HBase, fuggit about it." -- could you give a bit more information about what do you mean swap and...
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Author: Lin Ma,
2012-11-06, 05:06
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One mapper/reducer runs on a single JVM - MapReduce - [mail # user]
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...Hello Hadoop experts, I have a question in my mind for a long time. Supposing I am developing M-R program, and it is Java based (Java UDF, implements mapper or reducer interface). My q...
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Author: Lin Ma,
2012-11-06, 01:12
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