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Strange behavior when using MapReduce to process HBase. - HBase - [mail # user]
...Hi,I write a copyTable mapreduce program. My hbase version is 0.94.16. Severalrows in the source table contain multiple data versions. The Map functionlooks like follows:public void map(Immu...
   Author: yonghu, 2014-11-25, 10:12
Is it possible to get the table name at the Map phase? - HBase - [mail # user]
...Hello all,I want to implement difference operator by using MapReduce. I read twotables by using MultiTableInputFormat. In the Map phase, I need to tag thename of table into each row, but how...
   Author: yonghu, 2014-11-21, 12:56
It is possible to indicate a specific key range into a specific node? - HBase - [mail # user]
...Dear All,Suppose that I have a key range from 1 to 100 and want to store 1-50 in thefirst node and 51-100 in the second node. How can I do this in Hbase?regards!Yong ...
   Author: yonghu, 2014-11-02, 19:34
A use case for ttl deletion? - HBase - [mail # user]
...Hello,Can anyone give me a concrete use case for ttl deletions? I mean in whichsituation we should set ttl property?regards!Yong ...
   Author: yonghu, 2014-09-26, 15:20
Re: hbase memstore size - HBase - [mail # user]
...I did not quite understand your problem. You store your data in HBase, andI guess later you also will read data from it. Generally, HBase will firstcheck if the data exist in memstore, if no...
   Author: yonghu, 2014-08-06, 14:54
Re: HBase appends - HBase - [mail # user]
...Hi,If a author does not have hundreds of publications, you can directly writein one column. Hence, your column will contain multiple data versions. Thedefault data version is 3 but you can s...
   Author: yonghu, 2014-07-22, 18:11
Re: Moving older data versions to archive - HBase - [mail # user]
...I think you can define coprocessors to do this. For example, for every putcommand, you can keep the desired versions that you want, and later put theolder version into the other table or HDF...
   Author: yonghu, 2014-04-03, 19:35
Re: single node's performance and cluster's performance - HBase - [mail # user]
...I think the right understanding of this is it will slow down the data queryprocessing. You can think the RS who hit a heady I/O as a hotspot node. Itwill not slow down the whole cluster, it ...
   Author: yonghu, 2014-04-03, 19:29
Re: LSM tree, SSTable and fractal tree - HBase - [mail # user]
...Hbase uses LSM tree and SStable, not sure for fractal treeOn Fri, Feb 28, 2014 at 2:57 PM, Shahab Yunus wrote: ...
   Author: yonghu, 2014-02-28, 14:37
Re: When should we trigger a major compaction? - HBase - [mail # user]
...Before you want to trigger major compaction, let's first explain why do weneed major compaction. The major compaction will cause1. delete the data which is masked by tombstone;2. delete the ...
   Author: yonghu, 2014-02-21, 10:38
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NEW: Monitor These Apps!
elasticsearch, apache solr, apache hbase, hadoop, redis, casssandra, amazon cloudwatch, mysql, memcached, apache kafka, apache zookeeper, apache storm, ubuntu, centOS, red hat, debian, puppet labs, java, senseiDB