If you've noticed the default values of the above configuration, it's Long.MAX_VALUE.
This is set to discourage the users not to edit / re-configure it. The above configuration is to flush the messages from the cache to the disk (fsync). Kafka delegates the task of flushing the messages to disk to the OS Kernel. This is done to maintain faster read & write performance. Kafka doesn't rely on `fsync` for message durability. Instead, it relies on it's own replicated change-logs located in other brokers. -- Kamal On Wed, Aug 16, 2017 at 12:45 AM, Jakes John <jakesjohn12...@gmail.com> wrote: > During my Kafka installation, I got some questions with some of the > parameter configurations > > I see that log.flush.interval.messages and log.flush.interval.ms are > commented out in the default kafka server properties file. I read two > conflicting statements about these parameters. In one place, I read that it > is recommended not to configure these parameters. While in the other, it > says that flush time should not be huge else it will affect the > performance. What is the best configuration and recommended way? When do > I need to configure these parameters and what is the default behaviour? >
