Skip cluster state serialization to closed channel #67450
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Today if a client requests a cluster state and then closes the connection then we still do all the work of computing and serializing the cluster state before finally dropping it all on the floor. With this commit we introduce checks to make sure that the HTTP channel is still open before starting the serialization process. We also make the tasks themselves cancellable and abort any ongoing waiting if the channel is closed (mainly to make the cancellability testing easier). Finally we introduce a more detailed description of the task to help identify cases where clients are inefficiently requesting more components of the cluster state than they need. Backport of elastic#67413
DaveCTurner
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:Distributed Coordination/Cluster Coordination
elasticmachine
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Today if a client requests a cluster state and then closes the
connection then we still do all the work of computing and serializing
the cluster state before finally dropping it all on the floor.
With this commit we introduce checks to make sure that the HTTP channel
is still open before starting the serialization process. We also make
the tasks themselves cancellable and abort any ongoing waiting if the
channel is closed (mainly to make the cancellability testing easier).
Finally we introduce a more detailed description of the task to help
identify cases where clients are inefficiently requesting more
components of the cluster state than they need.
Backport of #67413