Comments on: Partitions, Backing Maps, and Services…Oh My!

By: Phani Kumar Pilli

Phani Kumar Pilli — Sat, 20 Jul 2013 01:54:41 +0000

simple, clear and very straight to the point. Thanks for your post. Keep post these kind of concepts.

By: justi myatt

justi myatt — Fri, 26 Aug 2011 20:33:03 +0000

Hi,

Loved the article, especially the diagrams, a picture 1000 words…

I’m trying to track down a copy of the PPT please for your talk “Introduction to Coherence for Developers and Architects”.
I’m working on a large Canadian OFM project and believe that Coherence would be a great fit, so I’m looking more to guide.

can you help please ?

By: Anil

Anil — Tue, 14 Dec 2010 23:28:09 +0000

Hi Patrick,
Yes I can get access to backing map but it will be only to backing map on a node where the entry processor is running. If my cache is running on multiple nodes how can i get access of all the backing maps?

I am implementing a concurrency for cache operation. I dont want to use cache.lock as it seems to be expensive performancewise. I will explain the problem. My cache is running on Node1 and Node2. The entryprocessor for cache key key1 runs on node1. This entryprocessor needs to access/update key2 of same cache. I cant access the key2 using cache.get inside entryprocessor as it will throw pollingexception.
So The only way to handle this problem is accessing backing map. But there is no guarentee that key2 will be on node1 , it can be on node2. So how can i access backing map of node2 inside entryprocessor running on node1? Or can you suggest any other way to handle this situdation?

By: Patrick Peralta

Patrick Peralta — Mon, 13 Dec 2010 18:05:50 +0000

Hi Anil,

I don’t recall a public API to get all backing maps for a service. The easiest way to get hold of one for a cache is from an entry processor. If you cast InvocableMap.Entry to BinaryEntry, you can invoke getBackingMap().

By: Anil

Anil — Fri, 10 Dec 2010 22:44:49 +0000

Hi Patrick, Can i get all the backing maps associated to cache service? If yes how ?

By: mikhail

mikhail — Thu, 25 Nov 2010 09:33:47 +0000

Thank you for your posts. I am very interested in topic about multiple partitioned cache services too. Please, find time to post it

By: Patrick Peralta

Patrick Peralta — Tue, 20 Jul 2010 17:54:26 +0000

@Phil – Thanks for the feedback! I think describing some of these concepts with diagrams goes a long way. It’s the next best thing to a live whiteboard session.

@Andy – Thanks for your feedback as well; I will try to write something up soon on configuring multiple services (and why you would/wouldn’t do it.)

By: Andy

Andy — Tue, 20 Jul 2010 12:50:55 +0000

You mentioned having multiple partitioned cache services, and said it would be covered in a future post. I am very interested in this topic, any help (via a post) would be appreciated!
Thanks.

By: phil wheeler

phil wheeler — Tue, 13 Jul 2010 16:43:02 +0000

Superb patrick, diagrams like this are incredibly helpful. Ideally Coherence would have a ‘concepts’ manual like Oracle DB. Diagrams like yours would be there to give readers a mental model of what is happening.