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Re: Error: Too Many Fetch Failures - Hadoop - [mail # user]
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... You are probably having a very low somaxconn parameter ( default cent os has it at 128 , if I remember correctly). You can check the value under /proc/sys/net/core/somaxconn &nbs...
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Author: Raj Vishwanathan,
2012-06-20, 00:42
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Re: Map works well, but Redue failed - Hadoop - [mail # user]
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...Most probably you have a network problem. Check your hostname and IP addres s mapping ng rsday, June 14, 2012 10:15 AM ror like below. ng task outputServer /192.168....
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Author: Raj Vishwanathan,
2012-06-16, 01:42
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Re: Map/Reduce Tasks Fails - Hadoop - [mail # user]
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...Sandeep How many network interfaces? Are the network shared between iS CSI and M/R communications? Is this the top when the system is idle or when you are getting errors? ...
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Author: Raj Vishwanathan,
2012-05-22, 17:49
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Re: Map/Reduce Tasks Fails - Hadoop - [mail # user]
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...What kind of storage is attached to the data nodes ? This kind of error can happen when the CPU is really busy with I/O or interrupts. Can you ru n top or dstat on some of the da...
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Author: Raj Vishwanathan,
2012-05-22, 14:53
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Re: Map/Reduce Tasks Fails - Hadoop - [mail # user]
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... loudera.com> , 2012 7:13 AM notice any machine patterns when observing the failed tasks (i.e. are ey clumped on any one or a few particular TTs repeatedly)? ay 22, 201...
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Author: Raj Vishwanathan,
2012-05-22, 14:50
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Re: High load on datanode startup - Hadoop - [mail # user]
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...Darrell Are the new dn,nn and mapred directories on the same physical disk? Nothing on NFS , correct? Could you be having some hardware issu e? Any clue in /var/log/message...
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Author: Raj Vishwanathan,
2012-05-10, 16:58
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Re: High load on datanode startup - Hadoop - [mail # user]
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...The picture either too small or too pixelated for my eyes :-) Can you login to the box and send the output of top? If the system is unresponsive, it has to be something mor...
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Author: Raj Vishwanathan,
2012-05-09, 21:52
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Re: High load on datanode startup - Hadoop - [mail # user]
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...When you say 'load', what do you mean? CPU load or something else? Raj [EMAIL PROTECTED]> sday, May 9, 2012 9:52 AM having? en pouring data ing along the way in...
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Author: Raj Vishwanathan,
2012-05-09, 21:23
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Re: Reduce Hangs at 66% - Hadoop - [mail # user]
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...Keith What is the the output for ulimit -n? Your value for number of o pen files is probably too low. Raj ____________ [EMAIL PROTECTED] t: Re: Reduce Hangs a...
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Author: Raj Vishwanathan,
2012-05-04, 00:03
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Re: hadoop streaming and a directory containing large number of .tgz files - Hadoop - [mail # user]
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...Sunil You could use identity mappers, a single identity reducer and by not having output compression., Raj ___________ f .tgz files t actually got mbersh...
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Author: Raj Vishwanathan,
2012-04-24, 14:29
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