+ another 2cents myself I think one innovative way to use the visibility tag is for version controls in development. I can set, say, "alpha", "beta", "released" visibility tags to each cell and set different users in testing and production. Looks like this will simplify testing a lot.
i.e. - production user: "production" - beta testing user: "beta" && "production" - alpha testing user: "alpha" && "beta" && "production" BTW, will they be counted as same record with different version? Or different records? Does that make sense? Jianshi On Wed, Jun 25, 2014 at 3:51 PM, Jianshi Huang <[email protected]> wrote: > (Think I only replied to David, so forward it here...Having both asc/desc > ordered CQ or RowKey is one way to solve it, and compression might reduce > the disk being used, but I guess it still need to use double the amount of > memory in cache.) > > One cool feature in HBase 0.98 that Accumulo doesn't have currently is > reverse scan. > > https://issues.apache.org/jira/browse/HBASE-4811 > > I already found a use case in my prototype! > > Jianshi > > > On Wed, Jun 25, 2014 at 2:04 AM, Jianshi Huang <[email protected]> > wrote: > >> Thank you David! Will do. >> >> >> On Wed, Jun 25, 2014 at 2:02 AM, David Medinets <[email protected] >> > wrote: >> >>> Each row is stored on one tablet server. If you have billions of >>> entries with the same row then you can overload the tablet server's >>> memory. Please read "Using Shards To Split a Row" at >>> >>> https://github.com/medined/D4M_Schema/blob/master/docs/data_distribution.md >>> >>> On Tue, Jun 24, 2014 at 1:59 PM, Jianshi Huang <[email protected]> >>> wrote: >>> > >>> > On Wed, Jun 25, 2014 at 1:47 AM, David Medinets < >>> [email protected]> >>> > wrote: >>> >> >>> >> You're sharding the row value I hope? >>> > >>> > >>> > Er... sorry, what do you mean? Some sort of reverted indexing? >>> > >>> > I might need to do it, right, then CF size will be quite large :), but >>> I can >>> > use an independent table, right? >>> > >>> > -- >>> > Jianshi Huang >>> > >>> > LinkedIn: jianshi >>> > Twitter: @jshuang >>> > Github & Blog: http://huangjs.github.com/ >>> >> >> >> >> -- >> Jianshi Huang >> >> LinkedIn: jianshi >> Twitter: @jshuang >> Github & Blog: http://huangjs.github.com/ >> > > > > -- > Jianshi Huang > > LinkedIn: jianshi > Twitter: @jshuang > Github & Blog: http://huangjs.github.com/ > > > > -- > Jianshi Huang > > LinkedIn: jianshi > Twitter: @jshuang > Github & Blog: http://huangjs.github.com/ > -- Jianshi Huang LinkedIn: jianshi Twitter: @jshuang Github & Blog: http://huangjs.github.com/
