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Streaming reporter counter vs status - Hadoop - [mail # user]
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...I understand the basic distinction between a counter and a status even though both kinds of messages are sent to the reporter. I'm particularly fond of the status messages ...
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Author: Keith Wiley,
2011-03-23, 18:02
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Streaming mappers frequently time out - Hadoop - [mail # user]
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...My streaming mappers frequently die with this error: Task attempt_201103101623_12864_m_000032_1 failed to report status for 602 seconds. Killing! A repeated attempt of the ...
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Author: Keith Wiley,
2011-03-23, 17:33
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Kill jobs take awhile to clear off job tracker - Hadoop - [mail # user]
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...Why does it take a long time (fractions of an hour or more sometimes) for kill jobs to disappear from the running jobs list of the job tracker? Clicking on such jobs will o...
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Author: Keith Wiley,
2011-03-18, 17:20
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Re: c++ problem - Hadoop - [mail # user]
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...Why don't you write up a typical Hello World in C++, then make that run as a mapper on Hadoop streaming (or pipes). If you send the "Hello World" to cout (as opposed to cer...
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Author: Keith Wiley,
2011-03-16, 15:43
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Frustrating "pending" statuses - Hadoop - [mail # dev]
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...Despite plenty of available mapper slots (as inferred by "Map Task Capacity" minus "Maps" on the jobtracker) our jobs often linger with all or many of the map tasks stuck in a pe...
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Author: Keith Wiley,
2011-03-15, 07:55
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Re: Not able to Run C++ code in Hadoop Cluster - Hadoop - [mail # user]
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...Not to speak against pipes because I don't have much experience with it, but I eventually abandoned my pipes efforts and went with streaming. If you don't get pipes to work...
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Author: Keith Wiley,
2011-03-14, 16:40
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Re: Linear slowdown producing streaming output - Hadoop - [mail # user]
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...I'm still trying to solve this problem. One person mentioned that mappers have to sort the data and that the sort buffer may be relevant but I'm seeing the same linear slow...
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Author: Keith Wiley,
2011-03-10, 09:00
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Re: map/reduce job conf settings ignored? (bug?) - Hadoop - [mail # user]
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...Also note that the property may have been set up as "final" meaning you can't override it (without reconfiguring the cluster). I had a problem like this. On Mar 4, 20...
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Author: Keith Wiley,
2011-03-04, 16:47
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Re: Speculative execution - Hadoop - [mail # user]
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...On Mar 3, 2011, at 3:29 PM, Jacob R Rideout wrote: wrote: should find the route cause, which is often some race condition or hardware fault. If it's the same server ever time, tu...
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Author: Keith Wiley,
2011-03-03, 23:52
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Re: Speculative execution - Hadoop - [mail # user]
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...On Mar 3, 2011, at 2:51 AM, Steve Loughran wrote: should find the route cause, which is often some race condition or hardware fault. If it's the same server ever time, turn it of...
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Author: Keith Wiley,
2011-03-03, 21:04
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