[GitHub] sijie commented on issue #1334: Experimental settings to achieve 5 ms latency

[GitBox <gi...@apache.org>]

sijie commented on issue #1334: Experimental settings to achieve 5 ms latency
URL: https://github.com/apache/pulsar/issues/1334#issuecomment-442595034
 
 
   > 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.

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