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Unable to understand error “SparkListenerBus has already stopped! Dropping event …” - Spark - [mail # user]
...Hi there,I'd like to know if anyone has a magic method to avoid such messages inSpark logs:2015-08-30 19:30:44 ERROR LiveListenerBus:75 - SparkListenerBus has alreadystopped! Dropping eventS...
   Author: Adrien Mogenet , 2015-09-02, 12:23
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
How Hbase achieves efficient random access? - HBase - [mail # user]
...btw, another worth reading article about block caches:http://www.n10k.com/blog/blockcache-101/On Mon, Jul 7, 2014 at 8:26 AM, Vladimir Rodionov wrote:Adrien Mogenethttp://www.borntosegfault....
   Author: Adrien Mogenet , 2014-07-07, 16:29
[Discuss] HBase with multiple threads - HBase - [mail # user]
...bq. "but in real it is one message write in whereas the other messagedropped."Have you tried to set logging at DEBUG level (hbase package on clientside)? You'll get helpful messages to analy...
   Author: Adrien Mogenet , 2014-06-07, 18:36
How can we process complex logic on hbase - HBase - [mail # user]
...Could you give us an example of what you call "complex logic"?Perhaps putting this logic on client side could make sense? (probably notyou want, just asking...)On Sat, May 17, 2014 at 7:26 P...
   Author: Adrien Mogenet , 2014-05-18, 08:45
Re: Java Client Write Data blocked - HBase - [mail # user]
...Nope, HTable#put(Put) is a single synchronous call.As JM said, use HTable#put(List) to send several Put operations toHBase.On Sun, May 4, 2014 at 4:19 AM, jingych  wrote:Adrien Mogeneth...
   Author: Adrien Mogenet , 2014-05-04, 10:48
Questions on FuzzyRowFilter - HBase - [mail # user]
...Using 4 random bytes you'll get 2^32 possibilities; thus your data can besplit enough among all the possible regions, but you won't be able toeasily benefit from distributed scans to gather ...
   Author: Adrien Mogenet , 2014-05-03, 08:11
[expand - 1 more] - testing co-processors - HBase - [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