[sheepdog-users] Locking problems on 0.9

[Micha Kersloot]

Hi,

----- Original Message -----
> From: "Hitoshi Mitake" <mitake.hitoshi at gmail.com>
> To: "Micha Kersloot" <micha at kovoks.nl>
> Cc: "Lista sheepdog user" <sheepdog-users at lists.wpkg.org>
> Sent: Thursday, November 20, 2014 3:54:01 PM
> Subject: Re: [sheepdog-users] Locking problems on 0.9

> On Tue, Nov 11, 2014 at 6:08 PM, Micha Kersloot <micha at kovoks.nl> wrote:
>> Hi Hitoshi,
>>
>> thank you for your time.
>>
>>
>> Cluster status: Waiting for other nodes to join cluster
>>
>> Cluster created at Tue Nov  4 14:22:03 2014
>>
>> Epoch Time           Version
>> 2014-11-04 16:55:02      9 [10.10.0.21:7001, 10.10.0.22:7001, 10.10.0.30:7001]
>> 2014-11-04 16:54:56      8 [10.10.0.21:7001, 10.10.0.30:7001]
>> 2014-11-04 16:54:33      7 [10.10.0.21:7001, 10.10.0.22:7001, 10.10.0.30:7001]
>> 1970-01-01 01:00:00      6 []
> 
> The above 6th epoch would be the root cause of the problem. An epoch
> with no nodes (clearly it cannot be happened on normal situation) can
> wipe data under sheepdog's recovery logic.
> I'll prepare a patch for avoiding creation of such an epoch later.
> 
> BTW, can you see such an epoch with no nodes in other sheep daemon?
> 

That would be on 10.10.0.21:

Cluster status: Waiting for other nodes to join cluster

Cluster created at Tue Nov  4 14:22:03 2014

Epoch Time           Version
2014-11-04 16:55:02      9 [10.10.0.21:7001, 10.10.0.22:7001, 10.10.0.30:7001]
2014-11-04 16:54:56      8 [10.10.0.21:7001, 10.10.0.30:7001]
2014-11-04 16:54:33      7 [10.10.0.21:7001, 10.10.0.22:7001, 10.10.0.30:7001]
2014-11-04 16:54:18      6 [10.10.0.21:7001, 10.10.0.22:7001]
2014-11-04 16:52:45      5 [10.10.0.21:7001, 10.10.0.22:7001, 10.10.0.30:7001]
1970-01-01 01:00:00      4 []
2014-11-04 16:47:43      3 [10.10.0.21:7001, 10.10.0.22:7001, 10.10.0.30:7001]
2014-11-04 16:46:43      2 [10.10.0.21:7001, 10.10.0.30:7001]
1970-01-01 01:00:00      1 []




---------
on 10.10.0.22:
Cluster status: Waiting for other nodes to join cluster

Cluster created at Tue Nov  4 14:22:03 2014

Epoch Time           Version
2014-11-04 16:55:02      9 [10.10.0.21:7001, 10.10.0.22:7001, 10.10.0.30:7001]
1970-01-01 01:00:00      8 []
2014-11-04 16:54:33      7 [10.10.0.21:7001, 10.10.0.22:7001, 10.10.0.30:7001]
2014-11-04 16:54:18      6 [10.10.0.21:7001, 10.10.0.22:7001]
2014-11-04 16:52:45      5 [10.10.0.21:7001, 10.10.0.22:7001, 10.10.0.30:7001]
2014-11-04 16:52:32      4 [10.10.0.22:7001, 10.10.0.30:7001]
2014-11-04 16:47:43      3 [10.10.0.21:7001, 10.10.0.22:7001, 10.10.0.30:7001]
1970-01-01 01:00:00      2 []
1970-01-01 01:00:00      1 []


---------------
on 10.10.0.30:
Cluster status: Waiting for other nodes to join cluster

Cluster created at Tue Nov  4 14:22:03 2014

Epoch Time           Version
2014-11-04 16:55:02      9 [10.10.0.21:7001, 10.10.0.22:7001, 10.10.0.30:7001]
2014-11-04 16:54:56      8 [10.10.0.21:7001, 10.10.0.30:7001]
2014-11-04 16:54:33      7 [10.10.0.21:7001, 10.10.0.22:7001, 10.10.0.30:7001]
1970-01-01 01:00:00      6 []
2014-11-04 16:52:45      5 [10.10.0.21:7001, 10.10.0.22:7001, 10.10.0.30:7001]
2014-11-04 16:52:32      4 [10.10.0.22:7001, 10.10.0.30:7001]
2014-11-04 16:47:43      3 [10.10.0.21:7001, 10.10.0.22:7001, 10.10.0.30:7001]
2014-11-04 16:46:43      2 [10.10.0.21:7001, 10.10.0.30:7001]
2014-11-04 14:22:03      1 [10.10.0.30:7001]