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Message from discussion How to reduce redis io usage
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Josiah Carlson  
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 More options Sep 30 2012, 9:20 pm
From: Josiah Carlson <josiah.carl...@gmail.com>
Date: Sun, 30 Sep 2012 18:20:23 -0700
Local: Sun, Sep 30 2012 9:20 pm
Subject: Re: How to reduce redis io usage
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Redis has been able to not block on requests during sync for quite a
while (maybe since 2.0). Somewhere around version 2.0 is also when
Redis got the option to serve stale data when sync had been lost (the
default in pre-2.0 versions), or to return an error (the new default).

And I am pretty sure that writing the incoming rdb to disk and being
able to serve requests prior to complete startup are independent and
unrelated. Redis should have always been writing incoming dumps to
disk, it's just that returning something during load was something
that would be useful to know (instead of blocking on startup).

Regards,
 - Josiah

On Sun, Sep 30, 2012 at 4:43 PM, Greg Andrews <hvar...@gmail.com> wrote:
> Wow, the copy to disk on the slave side is a new one to me.  Maybe that's
> how recent versions prevent the slave from blocking all querys during the
> SYNC.

>   -Greg

> On Sun, Sep 30, 2012 at 4:38 PM, Matthew Palmer <mpal...@hezmatt.org> wrote:

>> On Sun, Sep 30, 2012 at 04:29:50PM -0700, Greg Andrews wrote:
>> > Dvir, I haven't kept up-to-date on this particular behavior with
>> > versions
>> > after 2.2.x.  Does a Redis instance with persistence disabled still
>> > perform
>> > a AOF creation and write when a slave is attached and sends the SYNC
>> > command?

>> It's an RDB, but yes, connecting a slave triggers an RDB creation on the
>> master, and that RDB will be copied to disk on the slave before being
>> loaded into memory.

>> http://redis.io/topics/replication

>> - Matt

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