One reason that I can think of is that there is not a close() method on the iterator interface. If you had resources open, you won't know when to clean them up.
----- Original Message ----- From: "Donald Miner" <[email protected]> To: [email protected] Sent: Tuesday, April 29, 2014 10:20:40 AM Subject: Writing data from iterators Bit of a tangent... This came up earlier in the text indexing thread and below, and is something I've seen come up a couple of other times. What would it take to make it so something tabletserver-side could write to accumulo (in an "acceptable way")? Either be it an iterator/constraint or something new. -d On Tue, Apr 29, 2014 at 9:59 AM, Eric Newton <[email protected]> wrote: > I have taken a quick look at phoenix. It's baked into HBase-specific > features pretty hard. > > It uses coprocessors to do things like create index entries. This is a > common enough idiom in the HBase community, but not something we've > supported in Accumulo. In general, you do not want an accumulo Iterator or > Constraint generating data for other tables. > > However, a more sophisticated Percolator type implementation ( > https://github.com/keith-turner/Accismus) could support index generation > and query transactions. > > We could probably re-use a lot of it, but it's not going to be as simple as > changing the classes that talk to the database back-end. > > -Eric > > > On Tue, Apr 29, 2014 at 9:21 AM, Kepner, Jeremy - 0553 - MITLL < > [email protected]> wrote: > > > Hi James, > > Can you explain how the SQL layer to HBase works? > > Regards. -Jeremy > > > > On Apr 29, 2014, at 1:32 AM, James Taylor <[email protected]> > > wrote: > > > > > Hello, > > > Would there be any interest in developing a SQL-layer on top of > Accumulo? > > > I'm part of the Apache Phoenix project and we've built a similar system > > on > > > top of HBase. I wanted to see if there'd be interest on your end at > > working > > > with us to generalizing our client and provide in a server that would > do > > > Accumulo-specific push down in support of a SQL layer. I suspect > there's > > > enough similarity between HBase and Accumulo that this would be > feasible. > > > Thanks, > > > James > > > > > -- Donald Miner Chief Technology Officer ClearEdge IT Solutions, LLC Cell: 443 799 7807 www.clearedgeit.com
