+1 I would like to better understand these trade offs as well. Thanks, Michael Marshall
On Fri, Mar 26, 2021 at 3:09 PM Lari Hotari <lari.hot...@sagire.fi> wrote: > Hi all, > > A broker with a lot of topics (10k+) consumes a considerable amount of CPU > even while idling (no messages being processed). > > In profiling, I can see that most CPU is spent in > ManagedLedgerFactorImpl.doCacheEviction. It's also a major source of object > allocations (when a broker is idling). A similar observation was made by > Kirill K about a month ago. > > There is a configuration parameter called > managedLedgerCacheEvictionFrequency > which is documented as "Configure the cache eviction frequency for the > managed ledger cache (evictions/sec)" . > > I'd assume that by reducing the managedLedgerCacheEvictionFrequency, it's > possible to reduce CPU consumption. I'm just wondering what the tradeoff in > lowering the value is and why is the default value 100 evictions per > second? > > How does changing the managedLedgerCacheEvictionFrequency configuration > value impact the broker? > > > BR, Lari >
