Hi Darrel- +1
I am largely still thinking on this one (also from a *Spring* perspective), but I like your initial concept/idea. Will provide more feedback in time. Cheers, John On Fri, Jun 2, 2017 at 4:40 PM, Michael Stolz <mst...@pivotal.io> wrote: > +1 This is the easiest way to make colocation easy > > -- > Mike Stolz > Principal Engineer - Gemfire Product Manager > Mobile: 631-835-4771 > > On Jun 2, 2017 6:55 PM, "Darrel Schneider" <dschnei...@pivotal.io> wrote: > > > Geode partitioned regions usually partition the data based on the key's > > hashcode. > > You can do your own partitioning by implementing the PartitionResolver > > interface and configuring it on the partitioned region. > > > > In some use cases needing to deploy your class that implements > > PartitionResolver can be problematic so we would like to find a way to > > offer partitioning based on a portion of the key (instead of the default > > which uses the entire key) that does not require you to implement your > own > > PartitionResolver and does not require you to deploy your own code to do > > the custom partitioning. > > > > Another group of users that do not want to implement PartitionResolver > are > > non-java clients. So the solution is required to be usable by non-java > > geode clients without needing to reimplement the client to support a new > > feature. > > > > Another constraint on the solution is for it to be both easy to use and > > easy to implement. > > > > The proposed solution is to provide a class named: > > org.apache.geode.cache.StringPrefixPartitionResolver > > This class will implement PartitionResolver and have a default > constructor. > > To use it you need to configure a partitioned region's PartitionResolver > > using the already existing mechanism for this (api, gfsh, or xml). > > The StringPrefixPartitionResolver will require all keys on its region to > be > > of type String. > > It also requires that the string key contains at least one ':' character. > > The substring of the key that precedes the first ':' is the prefix that > > will be returned from "getRoutingObject". > > > > An example of doing this in gfsh is: > > create region --name=r1 --type=PARTITION > > --partition-resolver=org.apache.geode.cache. > StringPrefixPartitionResolver > > > > Note that attempting to use a key that is not a String or does not > contain > > a ':' will throw an exception. This is to help developers realize they > made > > a mistake. > > > > Note that the delimiter is always a ':'. It would be easy to made the > > delimiter configurable when using apis or xml but currently gfsh does not > > provide a way to pass parameters to the --partition-resolver create > region > > option. > > > > The only public api change this proposal makes is the new > > StringPrefixPartitionResolver class. > > > -- -John john.blum10101 (skype)
