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From "Dave Marion" <dlmar...@comcast.net>
Subject RE: Accumulo 1.6 and beyond feature summit
Date Tue, 29 Jan 2013 00:50:30 GMT
Ok. That one that I know of doesn't spin up a batch scanner, it makes a call
to another program.

-----Original Message-----
From: William Slacum [mailto:wilhelm.von.cloud@accumulo.net] 
Sent: Monday, January 28, 2013 7:33 PM
To: dev@accumulo.apache.org
Subject: Re: Accumulo 1.6 and beyond feature summit

Currently it's not recommended to launch a batch scanner from an iterator
and retrieve new information, due to the possibility of a dead lock. Other
services may alleviate that concern, but due to lifecycle management issues
(related to the "add a clean up method to iterators"), it's not fool proof
to clean up connections from it.

On Mon, Jan 28, 2013 at 7:21 PM, Dave Marion <dlmarion@comcast.net> wrote:

> "- Allowing iterators to launch connections to other services 
> (caching, other tservers) to retrieve or write data"
>
>   What does allow mean in this context? I don't think its disallowed 
> (I know of an iterator that does this).
>
> -----Original Message-----
> From: William Slacum [mailto:wilhelm.von.cloud@accumulo.net]
> Sent: Monday, January 28, 2013 7:13 PM
> To: dev@accumulo.apache.org
> Subject: Re: Accumulo 1.6 and beyond feature summit
>
> I'd like to see:
>
> - Data triggers on insertion
> - REST interface for looking up ranges of keys
> - A DSL or some other interpreted language for crafting iterators
>   - there's the clojure iterator, but something like python (via 
> jython) or javascript (via rhino) would be more adoptable
> - Adding a clean up hook to iterators
> - Allowing iterators to launch connections to other services (caching, 
> other
> tservers) to retrieve or write data
> - Merging of the batch scanner and scanner implementations
>   - a batch scanner with 1 thread have the same behavior as a scanner
>   - scanners have a close() method on them
> - Adding some builder interface for creating and introspecting 
> iterator stacks
> - Clients being able to scan to specific keys using the scan command
>
>


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