HH in 1.X+ is very good, but it is still an optimisation for achieving consistency.
>> So I expect that even if I loose some HH then some other replica will reply >> with data. Is it correct? Run a repair and see. Cheers ----------------- Aaron Morton Freelance Developer @aaronmorton http://www.thelastpickle.com On 11/04/2012, at 9:10 PM, Igor wrote: > On 04/11/2012 12:04 PM, ruslan usifov wrote: >> >> HH - this is hinted handoff? >> > Yes > >> 2012/4/11 Igor <i...@4friends.od.ua> >> On 04/11/2012 11:49 AM, R. Verlangen wrote: >> >> Not everything, just HH :) >> >> I hope this works for me for the next reasons: I have quite large RF (6 >> datacenters, each carry one replica of all dataset), read and write at CL >> ONE, relatively small TTL - 10 days, I have no deletes, servers almost never >> go down for hour. So I expect that even if I loose some HH then some other >> replica will reply with data. Is it correct? >> >> Hope this works for me, but can not work for others. >> >> >>> Well, if everything works 100% at any time there should be nothing to >>> repair, however with a distributed cluster it would be pretty rare for that >>> to occur. At least that is how I interpret this. >>> >>> 2012/4/11 Igor <i...@4friends.od.ua> >>> BTW, I heard that we don't need to run repair if all your data have TTL, >>> all HH works, and you never delete your data. >>> >>> >>> On 04/11/2012 11:34 AM, ruslan usifov wrote: >>>> >>>> Sorry fo my bad english, so QUORUM allow doesn't make repair regularity? >>>> But form your anser it does not follow >>>> >>>> 2012/4/11 R. Verlangen <ro...@us2.nl> >>>> Yes, I personally have configured it to perform a repair once a week, as >>>> the GCGraceSeconds is at 10 days. >>>> >>>> This is also what's in the manual >>>> http://wiki.apache.org/cassandra/Operations#Repairing_missing_or_inconsistent_data >>>> (point 2) >>>> >>>> >>>> 2012/4/11 ruslan usifov <ruslan.usi...@gmail.com> >>>> Hello >>>> >>>> I have follow question, if we Read and write to cassandra claster with >>>> QUORUM consistency level, does this allow to us do not call nodetool >>>> repair regular? (i.e. every GCGraceSeconds) >>>> >>>> >>>> >>>> -- >>>> With kind regards, >>>> >>>> Robin Verlangen >>>> www.robinverlangen.nl >>>> >>>> >>> >>> >>> >>> >>> -- >>> With kind regards, >>> >>> Robin Verlangen >>> www.robinverlangen.nl >>> >> >> >
