[v23.3.x] rm_stm: do not hold producer lock for the duration of the barrier #17578
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The lock ensures that the concurrent idempotent requests do not reorder at the raft layer, i.e if one of the requests within a concurrent batch of dempotent requests fail to replicate, the subsequent ones fail too. Upon hitting an OOOSN, we do not need to hold the lock as we are waiting for the barrier as we know for a fact that request that acquired this lock is of invalid sequence and does not affect the concurrently running requests. Holding the lock while the barrier returns just delays legit concurrent requests. (cherry picked from commit 91cac71)
bharathv
approved these changes
Apr 3, 2024
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Backport of PR #17472