sjvanrossum opened a new pull request, #32986:
URL: https://github.com/apache/beam/pull/32986
Allows a Kafka consumer to be used for bundled assignments. By decoupling
consumers from splits and running them in separate threads the harness thread
should be blocked less by the creation of network connections or outstanding
polls. The consumer thread may prefetch a batch of records while the harness
thread is processing the current record batch. Multiplexing assigned
`TopicPartition`s onto a single consumer may improve utilization of the network
connection. A follow up PR may introduce consumer pools for cases where a
single consumer would become a bottleneck. The state shared between the
consumer and harness thread can be retrieved and mutated without locking. The
lock-free exchange object of type `TopicPartitionState` fills a 64 byte cache
line and should not suffer from false sharing provided that the cache line is
64 bytes long and the object is placed at the start of a cache line.
Benchmarks to follow soon.
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