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From Edward Capriolo <edlinuxg...@gmail.com>
Subject Re: Really have to repair ?
Date Fri, 05 Apr 2013 21:59:46 GMT
There are a series of edge cases that dictate the need for repair. The
largest cases are 1) lost deletes 2) random disk corruptions

In our use case we only delete entire row keys, and if the row key comes
back it is not actually a problem because our software will find it an
delete it again. In those places we dodge running repair believe it or not.

Edward


On Fri, Apr 5, 2013 at 11:22 AM, Jean-Armel Luce <jaluce06@gmail.com> wrote:

> Hi Cyril,
>
> According to the documentation (
> http://wiki.apache.org/cassandra/Operations#Frequency_of_nodetool_repair),
> I understand that is is not necessary to repair every node before
> gc_grace_seconds if you are sure that you don't miss to run a repair each
> time a node is down longer than gc_grace_seconds.
>
> "*IF* your operations team is sufficiently on the ball, you can get by
> without repair as long as you do not have hardware failure -- in that case,
> HintedHandoff is adequate to repair successful updates that some replicas
> have missed"
>
> Am I wrong ? Thoughts ?
>
>
>
>
> 2013/4/4 <cscetbon.ext@orange.com>
>
>> Hi,
>>
>> I know that deleted rows can reappear if "node repair" is not run on
>> every node before *gc_grace_seconds* seconds. However do we really need
>> to obey this rule if we run "node repair" on node that are down for more
>> than *max_hint_window_in_ms* milliseconds ?
>>
>> Thanks
>>  --
>> Cyril SCETBON
>>
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