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Re: bulk deletes - HBase - [mail # user]
...Hi Anoop:  In my use case, I use extensively the version delete marker because I need to delete a specific version of a cell (row key, CF, qualifier, timestamp). I have a mapreduce job ...
   Author: Jerry Lam, 2012-10-12, 21:41
Re: HBase Key Design : Doubt - HBase - [mail # user]
...correct me if I'm wrong. The version applies to the individual cell (ie. row key, column family and column qualifier) not (row key, column family).   On Wed, Oct 10, 2012 at 3:13 PM, Na...
   Author: Jerry Lam, 2012-10-10, 19:24
Re: key design - HBase - [mail # user]
...That's true.Then there would be max. 86,400 records per day per userid. That is about 100MB per day. I don't see much difference in both approaches from the storage perspective.  On Wed...
   Author: Jerry Lam, 2012-10-10, 19:08
[HBASE-6757] Very inefficient behaviour of scan using FilterList - HBase - [issue]
...The behaviour of scan is very inefficient when using with FilterList.The FilterList rewrites the return code from NEXT_ROW to SKIP from a filter if Operator.MUST_PASS_ALL is used. This happe...
http://issues.apache.org/jira/browse/HBASE-6757    Author: Jerry Lam, 2012-10-05, 01:37
Re: HBase aggregate query - HBase - [mail # user]
...Hi Prabhjot:  Can you implement this using a counter? That is whenever you insert a row with the month(eventdate) and scene combination, increment the associated counter by one. Note th...
   Author: Jerry Lam, 2012-09-11, 18:48
Re: Reading in parallel from table's regions in MapReduce - HBase - [mail # user]
...Hi Loakim:  Here a list of links I would suggest you to read (I know it is a lot to read): HBase Related: - http://hbase.apache.org/apidocs/org/apache/hadoop/hbase/mapreduce/TableMapRed...
   Author: Jerry Lam, 2012-09-04, 17:05
Re: setTimeRange and setMaxVersions seem to be inefficient - HBase - [mail # user]
...Hi Ted:  Sure, will do. I also implement the reset method to set previousIncludedQualifier to null for the next row to come.  Best Regards,  Jerry  On Wed, Aug 29, 2012 a...
   Author: Jerry Lam, 2012-08-29, 18:36
Re: Column Value Reference Timestamp Filter - HBase - [mail # user]
...Hi Alex:  We decided to use setTimeRange and setMaxVersions, and remove the column with a reference timestamp (i.e. we don't put this column into hbase anymore). This behavior is what w...
   Author: Jerry Lam, 2012-08-27, 21:46
Re: Disk space usage of HFilev1 vs HFilev2 - HBase - [mail # user]
...Hi Anil:  Maybe you can try to compare the two HFile implementation directly? Let say write 1000 rows into HFile v1 format and then into HFile v2 format. You can then compare the size o...
   Author: Jerry Lam, 2012-08-14, 20:28
Re: multitable query - HBase - [mail # user]
...Hi Wei:  There is a jira Hbase-3996, does this sound something you are looking for?  Regards,  Jerry  On Friday, August 10, 2012, Bryan Beaudreault wrote:  ...
   Author: Jerry Lam, 2012-08-10, 14:20
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