[EMAIL PROTECTED] wrote : sync or async repl ? Can you describe this a bit
more in detail ?
I will do my best...
My application, for testing purposes, consists of a single client, an
application instance, and a cache loader instance. The client talks to the
application instance that fronts the cache, and the cache loader instance
contains just the cache configured to utilize a cache loader. Replication
between the cache instances happens asynchronously. The reason that the
application instance and cache loader instance are seperate is the use of a
cache loader on the application instance had a large impact to performance.
The application uses two top-level nodes in the cache, one /hash node and one
/root node. The /hash node's map contains a hash of all of the other
locations contained as decendents of the /root node. I think that part of my
problem is that as the /root tree grows, the map of the /hash node grows as
well (and can get quite large).
When using the Sleepycat cache loader, the CPU utilization of the cache loader
instance is extremely high (90+%), and persistence of cache data (viewed by
watching ReplicationInterceptor TRACE) lags way behind. If I use the
File-based cache loader, the lag is greatly diminished and the CPU utilization
is less, but the issue still remains.
My question is related to how might I improve on this lag. Could I create a
customized File-based cache loader so that it only writes the /hash node's
changes periodically? Could I try to change my objects to externalizeable from
serializeable? Cache-to-cache transient state transmission seems rather fast.
Could I perdiodically use that method for persistence instead of the single
changes captured by the cache loader? Any other thoughts or impressions?
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