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Failover Internals and Timing
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Cwolf  
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 More options Oct 8 2012, 3:01 am
From: Cwolf <chase.wolfin...@gmail.com>
Date: Mon, 8 Oct 2012 00:01:09 -0700 (PDT)
Local: Mon, Oct 8 2012 3:01 am
Subject: Failover Internals and Timing
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Hello - It seems that the replication heartbeat is not configurable.  In
1.8 it was (did not check 2.0).  Are there any details on how heartbeat and
fail-over timings work?   What is the timing on fail-overs now (it seems
fast - but need to understand).  We are looking to get sub second fail-over
working in an environment where all machines are on a single switch.

Thanks


 
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Cwolf  
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 More options Oct 8 2012, 10:59 am
From: Cwolf <chase.wolfin...@gmail.com>
Date: Mon, 8 Oct 2012 07:59:43 -0700 (PDT)
Local: Mon, Oct 8 2012 10:59 am
Subject: Re: Failover Internals and Timing
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Some more information:

I just did some experiments and it is taking up to 15 seconds to fail-over
on a primary step down.  This seems ridiculous. Does anyone know if this is
configurable?


 
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Stephen Steneker  
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 More options Oct 12 2012, 2:19 am
From: Stephen Steneker <stephen.stene...@10gen.com>
Date: Thu, 11 Oct 2012 23:19:16 -0700 (PDT)
Local: Fri, Oct 12 2012 2:19 am
Subject: Re: Failover Internals and Timing
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> Hello - It seems that the replication heartbeat is not configurable.  In
> 1.8 it was (did not check 2.0).  Are there any details on how heartbeat and
> fail-over timings work?   What is the timing on fail-overs now (it seems
> fast - but need to understand).  We are looking to get sub second fail-over
> working in an environment where all machines are on a single switch.

Hi,

You are correct that the replication heartbeat is not configurable.  The
heartbeat request can either receive a response, an error, or a timeout.
 Failover should happen within ~20 seconds.

The current documentation
is: http://www.mongodb.org/display/DOCS/Replica+Set+Internals

Failing too fast (sub-second, in particular) generally isn't a
positive/desirable outcome as you can cause flapping in the event of
transient network issues.

The replica set failover is generally still faster than the default TCP
timeout setting (which, depending on your O/S, can be up to a few minutes).

Cheers,
Stephen


 
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