[OpenAFS] Re: Setting the BOS Server's Restart Times

Jeffrey Altman jaltman@secure-endpoints.com
Wed, 13 Jan 2010 11:17:08 -0500


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On 1/13/2010 10:36 AM, Andrew Deason wrote:
> On Wed, 13 Jan 2010 09:52:26 +0100 (CET)
> Harald Barth <haba@kth.se> wrote:
>=20
>>
>>> Probably not an argument against changing the default (only happens
>>> on the largest cells with very long dbserver uptimes),=20
>>
>> "large" here means "many DB changes" I suppose?
>=20
> Yeah, sorry. I'm only aware of two instances of it happening, and they
> were very large cells. One of them Russ should recall:
> http://www.openafs.org/pipermail/openafs-info/2004-April/013238.html
>=20
>> So how should we detect a ubik ID rollover instead?
>=20
> I don't know; is it just if the trans id is negative?

I suspect the problem is in src/ubik/recovery.c urecovery_CheckTid().
If the tid.counter wraps negative then the comparison of 'atid' to
'ubik_currentTrans' will fail.

I believe (although I have not tested this) that when the
ubik_tid.counter wraps negative we need to reset it to 1 and begin
using a new epoch.   This is the behavior that is produced by the
service restarting.

Jeffrey Altman



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