dang-stripe commented on code in PR #17466:
URL: https://github.com/apache/pinot/pull/17466#discussion_r2669530074
##########
pinot-query-runtime/src/main/java/org/apache/pinot/query/service/dispatch/QueryDispatcher.java:
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@@ -555,6 +555,25 @@ private DispatchClient
getOrCreateDispatchClient(QueryServerInstance queryServer
return _dispatchClientMap.computeIfAbsent(hostnamePort, k -> new
DispatchClient(hostname, port, _tlsConfig));
}
+ /**
+ * Resets the DispatchClient for a server, clearing stale gRPC channel state
and creating a fresh connection.
+ * Call this when a server is re-enabled to bypass gRPC's exponential
backoff on reconnection which will cause
+ * requests to fast fail.
+ */
+ public void resetDispatchClient(ServerInstance serverInstance) {
+ String hostname = serverInstance.getHostname();
+ int port = serverInstance.getQueryServicePort();
+ String hostnamePort = String.format("%s_%d", hostname, port);
+ _dispatchClientMap.compute(hostnamePort, (key, oldClient) -> {
+ LOGGER.info("Resetting DispatchClient for server: {}",
serverInstance.getInstanceId());
+ if (oldClient != null) {
+ LOGGER.info("Shutting down old channel for server: {}",
serverInstance.getInstanceId());
+ oldClient.getChannel().shutdown();
Review Comment:
ah yes, didn't realize this was non-blocking. looks like there's also a
[`resetConnectBackoff`](https://grpc.github.io/grpc-java/javadoc/io/grpc/ManagedChannel.html#resetConnectBackoff())
on the channel API which would be less disruptive. let me try that first.
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