Reduce lock contention when disabling compactions #8567
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The monitor goroutine calls enable compactions every 10s to spin down (or start up) goroutines for cold shards. This frequent Lock may be causing lock contention for writes and queries which get blocked trying to acquire an RLock. The go RWMutex says that new RLock calls will block if there is a pending Lock call that is blocked. Switching the common path to use an RLock should avoid the Lock and reduce lock contention for writes and queries.
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The monitor goroutine calls enable compactions every 10s to spin down
(or start up) goroutines for cold shards. This frequent Lock may be
causing lock contention for writes and queries which get blocked trying
to acquire an RLock.
The go RWMutex says that new RLock calls will block if there is a
pending Lock call that is blocked. Switching the common path to use
an RLock should avoid the Lock and reduce lock contention for writes
and queries.
Required for all non-trivial PRs