Are you using a multi get or a range slice ? Read Repair does not run for range slice queries.
Cheers ----------------- Aaron Morton Freelance Cassandra Consultant New Zealand @aaronmorton http://www.thelastpickle.com On 15/05/2013, at 6:51 PM, Sergey Naumov <sknau...@gmail.com> wrote: >> see that RR works, but sometimes number of records have been read degrades. > RR is enabled on a random 10% of requests, see the read_repair_chance setting > for the CF. > > OK, but I forgot to mention the main thing - each node in my config is a > standalone datacenter and distribution is DC1:1, DC2:1, DC3:1. So when I try > to read 1000 records with consistency ONE multiple times while connected to > node that just have been turned on, I got the following count of records read > (approximately): 120 220 310 390 .... 950 960 965 !! 955 !! 970 ... If all > other nodes contain 1000 records and read repair already delivered 965 > records to local DC (and so - local node), why sometimes I see degradation of > total records read? > > > > 2013/5/15 aaron morton <aa...@thelastpickle.com> >> see that RR works, but sometimes number of records have been read degrades. > RR is enabled on a random 10% of requests, see the read_repair_chance setting > for the CF. > >> If so, then the question is: how to perform local reads to examine content >> of specific node? > You can check which nodes are replicas for a key using nodetool getendpoints > > If you want to read all the rows for a particular row you need to use a range > scan and limit it by the token ranges assigned to the node. > > Cheers > > ----------------- > Aaron Morton > Freelance Cassandra Consultant > New Zealand > > @aaronmorton > http://www.thelastpickle.com > > On 14/05/2013, at 10:29 PM, Sergey Naumov <sknau...@gmail.com> wrote: > >> Hello. >> >> I'am playing with demo cassandra cluster and decided to test read repair + >> hinted handoff. >> >> One node of a cluster was put down deliberately, and on the other nodes I >> inserted some records (say 1000). HH is off on all nodes. >> Then I turned on the node, connected to it with cql (locally, so to >> localhost) and performed 1000 reads by row key (with consistency ONE). I see >> that RR works, but sometimes number of records have been read degrades. Is >> it because consistency ONE and local reads is not the same thing? If so, >> then the question is: how to perform local reads to examine content of >> specific node? >> >> Thanks in advance, >> Sergey Naumov. > >
