m-trieu opened a new pull request, #28428:
URL: https://github.com/apache/beam/pull/28428
WindmillConnectionsCache will be used to consume GetWorkerMetadata response
and updates.
It exposes a separate read and write interface. The write interface will be
used for the caller of GetWorkerMetadata stream to be able to pass the response
along to the cache to consume. The read interface will be vended out to
GetWorkStream, GetDataStream, and CommitWorkStream call sites in order to fetch
connections directly to Streaming Engine Windmill Workers, or the Dispatcher.
WindmillConnectionCacheTokens will be used to attach to WorkItems to
correctly call GetDataStream and CommitWorkStream.
Since the WindmillConnectionsCache's will be shared, it uses AtomicReference
and synchronization around writes to the cache. Updates are all or nothing and
done under a lock/synchronization, and reads fetch a snapshot of the of the
AtomicReference's value to serve reads without locking.
r: @scwhittle
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