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Posted to commits@cassandra.apache.org by "Jonathan Ellis (JIRA)" <ji...@apache.org> on 2014/01/17 13:41:21 UTC
[jira] [Assigned] (CASSANDRA-6600) Huge read latency with LOCAL_ONE
when < RF nodes are up
[ https://issues.apache.org/jira/browse/CASSANDRA-6600?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Jonathan Ellis reassigned CASSANDRA-6600:
-----------------------------------------
Assignee: Michael Shuler
Can you reproduce, [~mshuler]?
> 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
>
> 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".
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