[Spread-users] Multicast after dynamic configuration

John Robinson jr at vertica.com
Thu Aug 21 23:47:47 EDT 2008


We noticed the same thing.  I like your dummy idea.

/jr
---
Mike Nuss wrote:
> Hi,
> 
>  
> 
> I’m trying to get dynamic configuration to work in Spread and I’ve run 
> into some quirky behavior.  The symptom is that if I have a single host 
> listed in the configuration file, then add a new host, issue the reload 
> command using spmonitor, and start Spread on the new host, the first 
> host does not see any messages from the second host.  If I then restart 
> Spread on the first host, everything starts working properly.
> 
>  
> 
> My suspicion (without looking at the code) is that Spread doesn’t listen 
> on the multicast address (I’m using 239.255.0.1) if there is only a 
> single entry in the config file.  However, after the reload, it 
> **should** start listening on that address, since there are now two 
> entries.  If it doesn’t, then it can’t communicate with the other host 
> unless the daemon is restarted.
> 
>  
> 
> To test this theory, I added a dummy entry to the original config file, 
> so I’m now going from 2 to 3 daemons instead of from 1 to 2.  The 
> reconfiguration works flawlessly now.  Is this just a coincidence, or is 
> my suspicion correct?  Is this a bug in Spread or is it expected behavior?
> 
>  
> 
> Thanks,
> 
> Mike
> 
> 
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> 
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