- pojocache prevent updates during replication

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- pojocache prevent updates during replication

- pojocache prevent updates during replication

2007-07-17 - By dh717

Back
I'm running pojocache 2.0.0 CR3 in a standalone two node active/hot-standby
cluster and I'm running into problems when brining up the second node (the hot
-standby). I'm using the replySync-service.xml configuration from the example
code (using TCP instead of multicast UDP). The active node is updating the
cache frequently (about once per second). When the hot-standby node comes
online, the active node will almost always throw a TimeoutException during the
state transfer because it will continue updating the cache during the state
transfer. The interleaving of the cache update and the state transfer appears
to cause a deadlock, which results in the TimeoutException being thrown. The
replicated state is fairly small (a Map<String, String> with less than 100
entries). I registered a custom @(protected) class that listens for
ViewChanged events and prevents the active node from writing to the pojocache
for the next five seconds and the problem seems to have gone away. Is there!
a better way to do this? Is there any way to hook into the underlying
replication code to prevent cache operations during replication? Are there any
configuration settings that can be used to prevent cache operations during
replication?

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