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Ryan McGuire updated CASSANDRA-6600: ------------------------------------ Labels: qa-resolved (was: ) > Huge read latency with LOCAL_ONE when < RF nodes are up > ------------------------------------------------------- > > Key: CASSANDRA-6600 > URL: https://issues.apache.org/jira/browse/CASSANDRA-6600 > Project: Cassandra > Issue Type: Bug > Components: Core > Reporter: Duncan Sands > Assignee: Michael Shuler > Labels: qa-resolved > > I recently upgraded a multi data centre cluster from 1.2.12 to 2.0.4. > In one data centre there are 3 nodes with an RF of 3. Clients are reading > from these nodes using CQL3 and LOCAL_ONE. At one point during the upgrade 1 > node was down, so less than RF nodes were up. Read latency went from < 1ms > to > 1 second. Once all nodes were up, read latency went back down to < 1ms. > If I stop a node then read latency shoots back up again. > This is not due to my client as I was able to reproduce this as follows. > With all RF nodes up: > connect to a node using cqlsh > set the consistency level to LOCAL_ONE > use cqlsh to read a few values from a random table - it completes instantly > bring down one of the other nodes in the same data centre > do the same query again in cqlsh. It times out with "Request did not > complete within rpc_timeout". -- This message was sent by Atlassian JIRA (v6.2#6252)