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[expand - 2 more] - High iowait in idle hbase cluster - Hadoop - [mail # user]
...What is your disk configuration? JBOD? If RAID, possibly a dysfunctionalRAID controller, or a constantly-rebuilding array.Do you have any idea at which files are linked the read blocks?On 4 ...
   Author: Adrien Mogenet , 2015-09-04, 10:08
How to find bottlenecks of the cluster ? - Hadoop - [mail # user]
...This is a non-sense ; you have to tell us under which conditions you wantto find a bottleneck.Regardless the workload, we mostly use OpenTSDB to check cpu times (iowait/ user / sys / idle), ...
   Author: Adrien Mogenet , 2015-03-02, 11:02
Interview Questions asked - Hadoop - [mail # user]
...I'm often asking candidates to explain :- how to compute the average values of a set?- then, why adding/not adding a combiner?- how to extract set of distinct values?And, if the candidate is...
   Author: Adrien Mogenet , 2015-02-15, 10:55
Poor HDFS performances: "Slow BlockReceiver write packet to mirror" - Hadoop - [mail # user]
...Hi there,I'd like to submit a strange behavior while instanciating another newHadoop cluster, on a new hardware stack.Once everything got installed, as soon as we try to perform any I/Oopera...
   Author: Adrien Mogenet , 2015-01-16, 08:10
testing co-processors - Hadoop - [mail # user]
...Hi,You can load your CP through the HBaseTesting utility and test it that way!-- Adrien MogenetFrom my mobile phoneOn 29 Jan 2014 07:25, "Sujee Maniyam"  wrote:> Hi all,>> I am...
   Author: Adrien Mogenet , 2014-01-29, 06:37