Spawning new entry processors from within an existing entry processor

Is it possible / legal to spawn a new entry processor (to operate within a different cache) from within an existing entry processor.
E.g we have a parent and a child cache, We will receive an update of the parent and start an entry processor to do this. Off the back of the parent update we will also need to update some child entries in another cache and need to start a new entry processor for the child entries. Is it legal to do this?

Hi Ghanshyam,
yes, in case of (a), you would be mixing different types in the same cache. There is nothing wrong with that from Coherence's point of view, as long as all code which is supposed to access such objects in their deserialized form is able to handle this situation.
This means that you need to use special extractors for creating indexes, and you need to write your filters, entry processors and aggregators appropriately to take this into account. But that's all it means.
The EntryProcessor on the child could be invoked, so long as there are more service
threads configured. This allows retaining partition affinity. I don't think this is technically
illegal.It is problematic, as invoking an entry-processor from another entry-processor in the same cache service can lead to deadlock/livelock situations. You won't find it out in a simple test as you get an exception or not.
But even if it is technically not guarded against, firing a second entry-processor consumes an additional thread from the thread-pool. Now if you get to a situation when all (or at least more than half of the thread-pool size) of your entry-processors try to fire an additional entry-processor, and there are no more threads in the thread-pool, then some or all would be waiting for a thread to be available, and of course none would be available, because there are not enough single-thread entry-processors to leave to get a thread to everyone.
However, none of them can back off as all are waiting for the fired entry-processor to complete. Poof, no processing is possible on your cache service.
Another problematic situation which can arise if entry processors are fired from entry processors is that your entry-processors may deadlock on entries (entry processors executing on some entries and trying to execute on another entry on which another entry processor executes and also tries to execute on the first entry). In this case the entry-processors would wait on each other to execute.
No code running in the cache server invoked by Coherence is supposed to access a cache service from code running in the threads of the same cache service, except for a couple of specifically named operations which only release resources but not consume additional new ones.
Best regards,
Robert

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Spawning new entry processors from within an existing entry processor

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