That's right. A message is exposed to the consumer as soon as it reaches all in-sync replicas. Whether it's flushed to disk or not depends on the configuration of flush interval.
Thanks, Jun On Thu, Aug 21, 2014 at 3:37 AM, Manjunath Shivakumar < manjunath.shivaku...@betfair.com> wrote: > Or to re frame the question when replication is enabled. > > Will the message be available to consumers as soon as the message has been > replicated to an in-sync follower, even before it is flushed to the disk. > > Thanks, > Manju > ________________________________ > From: Manjunath Shivakumar > Sent: 21 August 2014 07:01 > To: users@kafka.apache.org > Subject: Re: fsync behaviour > > > Thanks Jun. If the log flush interval is more than 1, will the unflushed > messages be visible to the consumers before being written to disk. > > Thanks, > Manju > > On 21 Aug 2014 06:03, Jun Rao <jun...@gmail.com> wrote: > 1) if you configure the log flush interval to be 1 message, every produce > request will be flushed to disk before the response is sent to the > producer. > > Thanks, > > Jun > > > On Tue, Aug 19, 2014 at 6:00 PM, Manjunath Shivakumar < > manjunath.shivaku...@betfair.com> wrote: > > > Hi, > > > > I wanted to understand the exact behaviour of kafka ( 0.8.1.1 ) w.r.t > > fsync. I have read the documentation and some related forum posts, but > > wanted to confirm the understanding here. > > > > 1) If we set the log flush to happen on every message, will it happen > > synchronously with each produce request, or happen in the background, > while > > the produce request returns immediately? > > > > 2) If the fsync happens asynchronous to the produce requests, will the > > consumers be able to see the messages which are yet to be fsync'ed. > > > > Thanks, > > Manjunath > > > > ________________________________________________________________________ > > In order to protect our email recipients, Betfair Group use SkyScan from > > MessageLabs to scan all Incoming and Outgoing mail for viruses. > > > > ________________________________________________________________________ > > ________________________________________________________________________ > In order to protect our email recipients, Betfair Group use SkyScan from > MessageLabs to scan all Incoming and Outgoing mail for viruses. > > ________________________________________________________________________ >
