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Posted to user@cassandra.apache.org by Jan Algermissen <al...@icloud.com> on 2017/05/29 15:07:25 UTC
How to know when repair repaired something?
Hi,
is it possible to extract from repair logs the writetime of the writes
that needed to be repaired?
I have some processes I would like to re-trigger from a time point if
repair found problems.
Is that useful? Possible?
Jan
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Re: How to know when repair repaired something?
Posted by Jan Algermissen <al...@icloud.com>.
On 30 May 2017, at 21:11, Varun Gupta wrote:
> I am missing the point, why do you want to re-trigger the process post
> repair. Repair will sync the data correctly.
Sorry - I mis-represented that. I want to trigger something else, not
repair.
I am investigating a CQRS/Event Sourced pattern which C* as a
distributed event log and a process reading from that log, changing
state in other data bases (Solr, Graph-DB, other C* tables, etc.)
Since I do not want to write to/read from the commit log with
EACH_QUORUM or LOCAL_QUORUM it could happen that the process processing
the event log misses an event that only later pops up during repair.
What that happens, I'd like to re-process the log (my processing is
idempotent, so it can just go again).
This is why I was looking for a way to learn that a repair has actually
repaired something.
Jan
> On Mon, May 29, 2017 at 8:07 AM, Jan Algermissen
> <algermissen1971@icloud.com
>> wrote:
>
>> Hi,
>>
>> is it possible to extract from repair logs the writetime of the
>> writes
>> that needed to be repaired?
>>
>> I have some processes I would like to re-trigger from a time point if
>> repair found problems.
>>
>> Is that useful? Possible?
>>
>> Jan
>>
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>> To unsubscribe, e-mail: user-unsubscribe@cassandra.apache.org
>> For additional commands, e-mail: user-help@cassandra.apache.org
>>
>>
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Re: How to know when repair repaired something?
Posted by Varun Gupta <va...@uber.com>.
I am missing the point, why do you want to re-trigger the process post
repair. Repair will sync the data correctly.
On Mon, May 29, 2017 at 8:07 AM, Jan Algermissen <algermissen1971@icloud.com
> wrote:
> Hi,
>
> is it possible to extract from repair logs the writetime of the writes
> that needed to be repaired?
>
> I have some processes I would like to re-trigger from a time point if
> repair found problems.
>
> Is that useful? Possible?
>
> Jan
>
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> To unsubscribe, e-mail: user-unsubscribe@cassandra.apache.org
> For additional commands, e-mail: user-help@cassandra.apache.org
>
>