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Chris Lu
7bf2dfc9ab
* Bound the metadata-log flush queue A stalled flush, e.g. slow volume servers under a reconnect storm, let up to 256 queued 8MB buffer copies pin two gigabytes per log buffer while producers kept filling the queue. Cap the queue at 16 so a sustained stall backpressures writers instead of growing the heap. The flush goroutine never feeds back into the buffer (system-log paths skip event notification), so blocked producers cannot deadlock the consumer. * Don't drop a force-flushed buffer on a full queue ForceFlush enqueued with a two-second timeout, but by then the live buffer was already sealed and reset, so a timed-out send silently lost the copy. Block until the flush is queued; the wait for completion stays bounded since the data is durable once the flush loop drains it. * Never close the flush channel ShutdownLogBuffer closed flushChan while producers could still be blocked sending into it, which panics. Terminate loopFlush with a nil sentinel instead, so the channel is never closed, and give every producer-side send a shutdown escape so none parks forever once the flush loop exits. Everything queued before the sentinel still drains, preserving IsAllFlushed semantics. * Copy the shutdown flush under the buffer lock Every other copyToFlush call site holds the lock; the shutdown path read the live buffer unlocked while producers could still be appending.