coherence can be compared most directly to Terracotta. however Terracotta only provides 2-way clustering, and the second node must be a standby. coherence provides a single-image shared memory for multiple java applications across a grid; and all grid nodes are fully active (can read/write to the shared memory) and replicated. so losing a node is not fatal (all data on a node is replicated on AT LEAST one other node).
adding new nodes means some backups get copied to that new node to distribute the load more effectively. losing nodes means the data on that node is shifted to the backup node, while backups on that node are re-copied to one of the surviving nodes. with a 1000-node cluster, coherence can do ~25M aggregations per second (that's 25M puts into the shared store). of course reads are much, much faster, and a general workload would have an app reading stuff from the store, crunching on it for a long-ish time, and then doing a put back into the store once done. On 6/17/07, Cocoy Dayao <[EMAIL PROTECTED]> wrote: > > On 06 17, 07, at 3:10 PM, Orlando Andico wrote: > > > > And, adding or removing nodes from the cluster "re-arranges" it > > automatically to load-balance with the new nodes. > > > > very nice. sorry my brain is still turned off... sundays can have > that effect. anyway this point is very interesting. > > ------------ > Cocoy Dayao > [EMAIL PROTECTED] > big mango - http://arkangel1a.blogspot.com > "People who are really serious about software should make their own > hardware." --Alan Kay > > > > _________________________________________________ > Philippine Linux Users' Group (PLUG) Mailing List > [email protected] (#PLUG @ irc.free.net.ph) > Read the Guidelines: http://linux.org.ph/lists > Searchable Archives: http://archives.free.net.ph > -- Orlando Andico Sales Consulting - Emerging Technologies ASEAN Oracle (Philippines) Corporation The statements and opinions expressed here are my own and do not necessarily represent those of Oracle Corporation. _________________________________________________ Philippine Linux Users' Group (PLUG) Mailing List [email protected] (#PLUG @ irc.free.net.ph) Read the Guidelines: http://linux.org.ph/lists Searchable Archives: http://archives.free.net.ph
