Fix provider update race condition and Fury thread-local instance churn

[Copilot]

Two independent bugs: a race condition causing unavailableProviderException under load when new providers register, and unbounded Fury instance creation causing full GC at high throughput.

AbstractCluster: connection-before-address ordering (#1490)

updateAllProviders and updateProviders were registering addresses in AddressHolder before connections were established in ConnectionHolder. This opened a window where load balancers could select a provider whose transport wasn't ready yet.

Fix: establish connections first, then make addresses visible.

// Before — address visible before connection exists
addressHolder.updateAllProviders(providerGroups);
connectionHolder.updateAllProviders(providerGroups);

// After — connection ready before address is discoverable
connectionHolder.updateAllProviders(providerGroups);
addressHolder.updateAllProviders(providerGroups);

FurySerializer: stop destroying thread-local Fury instances (#1424)

Every encode/decode call ended with fury.clearClassLoader(contextClassLoader) in a finally block, which destroys the thread-local Fury instance unconditionally. The next call reconstructs it from scratch — at 20k TPS this produced ~4,500 Fury instances and triggered FGC.

Fix: remove clearClassLoader from the hot path. fury.setClassLoader(contextClassLoader) at the start of each call already handles classloader changes correctly (it creates a new Fury instance only when the classloader actually differs), so removing the teardown allows thread-local instances to be reused across calls.

Warning

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