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[expand - 1 more] - Re: HBase aggregate query - HBase - [mail # user]
...No, there's no sorted dimension. This would be a full table scan over  40M rows. This assumes the following: 1) your regions are evenly distributed across a four node cluster 2) unique ...
   Author: James Taylor, 2012-09-13, 19:13
[HBASE-6137] RegionServer-level context and start/stop life-cycle methods for observer coprocessor - HBase - [issue]
...Coprocessors are a great way for an application to affect server-side processing. We're using observer coprocessors via the postScannerOpen to enable a scan to do aggregation. There's curren...
http://issues.apache.org/jira/browse/HBASE-6137    Author: James Taylor, 2012-08-06, 18:19
Re: aggregation performance - HBase - [mail # user]
...We're seen reasonable performance, with the caveat that you need to  parallelize the scan doing the aggregation. In our benchmarking, we have  the client scan each region in parall...
   Author: James Taylor, 2012-05-03, 17:02
[HBASE-5710] NPE in MiniCluster during metadata scan for a pre-split table with multiple column families - HBase - [issue]
...In the MiniCluster test environment, an NPE occurs while scanning regionsof a pre-split table with multiple column families. Without this workingin the test environment, you cannot write uni...
http://issues.apache.org/jira/browse/HBASE-5710    Author: James Taylor, 2012-04-05, 20:37
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