[Gluster-users] [Gluster-devel] Don't allow data loss via add-brick (was Re: Add single server)

[Nithya Balachandran]

On 2 May 2017 at 16:59, Shyam <srangana at redhat.com> wrote:

> Talur,
>
> Please wait for this fix before releasing 3.10.2.
>
> We will take in the change to either prevent add-brick in
> sharded+distrbuted volumes, or throw a warning and force the use of --force
> to execute this.
>
> IIUC, the problem is less the add brick operation and more the
rebalance/fix-layout. It is those that need to be prevented (as someone
could trigger those without an add-brick).

Nithya

> Let's get a bug going, and not wait for someone to report it in bugzilla,
> and also mark it as blocking 3.10.2 release tracker bug.
>
> Thanks,
> Shyam
>
> On 05/02/2017 06:20 AM, Pranith Kumar Karampuri wrote:
>
>>
>>
>> On Tue, May 2, 2017 at 9:16 AM, Pranith Kumar Karampuri
>> <pkarampu at redhat.com <mailto:pkarampu at redhat.com>> wrote:
>>
>>     Yeah it is a good idea. I asked him to raise a bug and we can move
>>     forward with it.
>>
>>
>> +Raghavendra/Nitya who can help with the fix.
>>
>>
>>
>>     On Mon, May 1, 2017 at 9:07 PM, Joe Julian <joe at julianfamily.org
>>     <mailto:joe at julianfamily.org>> wrote:
>>
>>
>>         On 04/30/2017 01:13 AM, lemonnierk at ulrar.net
>>         <mailto:lemonnierk at ulrar.net> wrote:
>>
>>                 So I was a little but luck. If I has all the hardware
>>                 part, probably i
>>                 would be firesd after causing data loss by using a
>>                 software marked as stable
>>
>>             Yes, we lost our data last year to this bug, and it wasn't a
>>             test cluster.
>>             We still hear from it from our clients to this day.
>>
>>                 Is known that this feature is causing data loss and
>>                 there is no evidence or
>>                 no warning in official docs.
>>
>>             I was (I believe) the first one to run into the bug, it
>>             happens and I knew it
>>             was a risk when installing gluster.
>>             But since then I didn't see any warnings anywhere except
>>             here, I agree
>>             with you that it should be mentionned in big bold letters on
>>             the site.
>>
>>             Might even be worth adding a warning directly on the cli
>>             when trying to
>>             add bricks if sharding is enabled, to make sure no-one will
>>             destroy a
>>             whole cluster for a known bug.
>>
>>
>>         I absolutely agree - or, just disable the ability to add-brick
>>         with sharding enabled. Losing data should never be allowed.
>>         _______________________________________________
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>>
>>
>>
>>
>>     --
>>     Pranith
>>
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>>
>>
>>
>> --
>> Pranith
>>
>>
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