Thanks good to know that. On Tue, Jun 23, 2015 at 11:27 AM, Philip Thompson < [email protected]> wrote:
> 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 <[email protected]> > 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 < >> [email protected]> 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 <[email protected]> >>> 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" <[email protected]> >>>> *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 <[email protected]> >>>> 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 >> >> > -- Arun Senior Hadoop/Cassandra Engineer Cloudwick 2014 Data Impact Award Winner (Cloudera) http://www.cloudera.com/content/cloudera/en/campaign/data-impact-awards.html
