Yes, that is what he means. CL is for how many nodes need to respond, not agree.
On Tue, Jun 23, 2015 at 2:26 PM, arun sirimalla <arunsi...@gmail.com> wrote: > So do you mean with CL set to QUORUM, if data is only on one node, the > query still succeeds. > > On Tue, Jun 23, 2015 at 11:21 AM, Philip Thompson < > philip.thomp...@datastax.com> wrote: > >> Anuj, >> >> In the first scenario, the data from the single node holding data is >> returned. The query will not fail if the consistency level is met, even if >> the read was inconsistent. >> >> On Tue, Jun 23, 2015 at 2:16 PM, Anuj Wadehra <anujw_2...@yahoo.co.in> >> wrote: >> >>> 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 >>> >> >> > > > -- > Arun > Senior Hadoop/Cassandra Engineer > Cloudwick > > > 2014 Data Impact Award Winner (Cloudera) > > http://www.cloudera.com/content/cloudera/en/campaign/data-impact-awards.html > >
