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fix: do not let _resolve/cluster hang if remote is unresponsive (#119516) (#119528)

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* fix: do not let `_resolve/cluster` hang if remote is unresponsive

Previously, `_resolve/cluster` would wait for a response from a remote
as part of the connection strategy. If the remote were to be
unresponsive, this API would wait until `netty` would terminate the
connection with a handshake exception. The threshold for terminating the
connection is `10s`. This means that the API would wait for `10s` before
determining that the remote is unresponsive. This strategy is now
replaced with a fail fast where a response is sent back to the user
immediately rather than waiting for a connection termination.

* Update docs/changelog/119516.yaml
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Pawan Kartik 2025-01-03 17:45:12 +00:00 • committed by GitHub
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5
docs/changelog/119516.yaml Normal file
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@ -0,0 +1,5 @@
pr: 119516
summary: "Fix: do not let `_resolve/cluster` hang if remote is unresponsive"
area: Search
type: bug
issues: []

2
server/src/main/java/org/elasticsearch/action/admin/indices/resolve/TransportResolveClusterAction.java
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@ -141,7 +141,7 @@ public class TransportResolveClusterAction extends HandledTransportAction<Resolv
RemoteClusterClient remoteClusterClient = remoteClusterService.getRemoteClusterClient(
clusterAlias,
searchCoordinationExecutor,
RemoteClusterService.DisconnectedStrategy.RECONNECT_IF_DISCONNECTED
RemoteClusterService.DisconnectedStrategy.FAIL_IF_DISCONNECTED
);
var remoteRequest = new ResolveClusterActionRequest(originalIndices.indices(), request.indicesOptions());
// allow cancellation requests to propagate to remote clusters