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hadoop streaming troubles - MapReduce - [mail # user]
...Hello, I am using hadoop-0.20.2-cdh3u1.  First question:     can one ommit sorting in streaming (e.g. when one only sums numbers)?  Second question:     Why do ...
   Author: Pavel Hančar, 2013-12-19, 15:30
slow operation in postPut - HBase - [mail # user]
...Hello, I have a class extending BaseRegionObserver and I use the postPut method to run a slow procedure. I'd like to run more these procedures in more threads. Is it possible to run more HTa...
   Author: Pavel Hančar, 2013-08-01, 12:58
[expand - 3 more] - Re: coprocessorExec got stucked with generic type - HBase - [mail # user]
...oops - I forgot to answer. The NameAndDistance doesn't implement org.apache.hadoop.io.Writable, so thanks Gary, it looks like a good alternative. But I stayed with SerializationUtils, becaus...
   Author: Pavel Hančar, 2013-07-02, 09:55
debugging coprocessors in Netbeans - HBase - [mail # user]
...Hello, please, do you have a tip for debugging of coprocessors in Netbeans? I've got stuck on the line table.coprocessorExec{ and I am not able to trace the coprocessor. I tried to run HBase...
   Author: Pavel Hančar, 2013-05-31, 10:35
[expand - 1 more] - Re: Endpoint vs. Observer Coprocessors - HBase - [mail # user]
...Hello, I'd like to have an object (index of vectors of pictures) in RAM of every regionserver. To have a variable of some Coprocessor class seems to be good way. I need to add a new vector t...
   Author: Pavel Hančar, 2013-05-03, 12:55
[expand - 1 more] - Re: HBase tasks - HBase - [mail # user]
...Hi, thanks for the answer. Yes I meant in-memory column family. But please, does it matter if I have two column families in separate tables or not? Or is it somehow stupid to have a table wi...
   Author: Pavel Hančar, 2013-04-09, 19:21
[expand - 2 more] - Re: more reduce tasks - Hadoop - [mail # user]
... Thank you, and I apologize for my bad undestanding of MapReduce. I forgot, the data for reduce tasks are grouped by keys and therefore they need nothing like second round. My "simple e...
   Author: Pavel Hančar, 2013-01-05, 14:32
[expand - 1 more] - Re: /etc/hosts - MapReduce - [mail # user]
... Really no one knows? Please, can you advise me at least some other mailing list, where I can ask this question?   Thnaks,    Pavel  2012/12/8 Pavel Hančar  ...
   Author: Pavel Hančar, 2012-12-12, 11:18
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