stauvel edited a comment on issue #1334: Experimental settings to achieve 5 ms latency URL: https://github.com/apache/pulsar/issues/1334#issuecomment-577692121 > > What's the order for Pulsar, when we disable forced fsync (and also when its on)? > > pulsar's replication mechanism is handled by bookkeeper. bookkeeper is using a parallel replication scheme. with that being said, broker writes the data concurrently to a set of bookies and waiting for a majority (write-quorum-size) of responses coming back before acknowledging the publisher. > > so the difference between fsync enabled and fsync disabled is that: > > * fsync enabled: bookie sends responses back to brokers when it successfully writes data to filesystem and the data is fsynced to disks. > * fsync disabled: bookie sends responses back to brokers when it successfully writes data to filesystem. I add this link in reaction to this : https://kafkaesque.io/performance-comparison-between-apache-pulsar-and-kafka-latency/
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