Btw, Hope you'll find the answers you could not ask in today online lesson ;-).
C*heers 2015-06-23 20:22 GMT+02:00 Alain RODRIGUEZ <arodr...@gmail.com>: > Hi, > > I do not agree with Scenario 1 result Arun, > > The 2 nodes don't have the data yet are available. IMHO what happens next > i a slow read since it will have to perform read repair and coordinator > will send back the result and an 'OK' message.Consistency is not met when > nor enough nodes were up. > > Agreed on scenario 2. I would add that one repair will be synchronous and > mandatory while the second depends on your read repair chance parameter on > this table and is async. > > C*heers > > 2015-06-23 20:16 GMT+02:00 Anuj Wadehra <anujw_2...@yahoo.co.in>: > >> Why would it fail and with what Thrift error? What if the data didnt >> exist on any of the nodes..query wont fail if doesnt find data.. >> >> Not convinced.. >> >> Sent from Yahoo Mail on Android >> <https://overview.mail.yahoo.com/mobile/?.src=Android> >> ------------------------------ >> *From*:"arun sirimalla" <arunsi...@gmail.com> >> *Date*:Tue, 23 Jun, 2015 at 11:39 pm >> *Subject*:Re: Read Consistency >> >> Scenario 1: Read query is fired for a key, data is found on one node and >> not found on other two nodes who are responsible for the token >> corresponding to key. >> >> You read query will fail, as it expects to receive data from 2 nodes with >> RF=3 >> >> >> Scenario 2: Read query is fired and all 3 replicas have different data >> with different timestamps. >> >> Read query will return the data with most recent timestamp and trigger a >> read repair in the backend . >> >> On Tue, Jun 23, 2015 at 10:57 AM, Anuj Wadehra <anujw_2...@yahoo.co.in> >> wrote: >> >>> Hi, >>> >>> Need to validate my understanding.. >>> >>> RF=3 , Read CL = Quorum >>> >>> What would be returned to the client in following scenarios: >>> >>> Scenario 1: Read query is fired for a key, data is found on one node and >>> not found on other two nodes who are responsible for the token >>> corresponding to key. >>> >>> Options: no data is returned OR data from the only node having data is >>> returned? >>> >>> Scenario 2: Read query is fired and all 3 replicas have different data >>> with different timestamps. >>> >>> Options: data with latest timestamp is returned OR something else??? >>> >>> Thanks >>> Anuj >>> >>> Sent from Yahoo Mail on Android >>> <https://overview.mail.yahoo.com/mobile/?.src=Android> >>> >> >> >> >> -- >> Arun >> > >
