[jira] [Assigned] (CASSANDRA-2034) Make Read Repair unnecessary when Hinted Handoff is enabled
[ https://issues.apache.org/jira/browse/CASSANDRA-2034?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] Jonathan Ellis reassigned CASSANDRA-2034: - Assignee: Patricio Echague (was: Sylvain Lebresne) Make Read Repair unnecessary when Hinted Handoff is enabled --- Key: CASSANDRA-2034 URL: https://issues.apache.org/jira/browse/CASSANDRA-2034 Project: Cassandra Issue Type: Improvement Components: Core Reporter: Jonathan Ellis Assignee: Patricio Echague Fix For: 1.0 Original Estimate: 8h Remaining Estimate: 8h Currently, HH is purely an optimization -- if a machine goes down, enabling HH means RR/AES will have less work to do, but you can't disable RR entirely in most situations since HH doesn't kick in until the FailureDetector does. Let's add a scheduled task to the mutate path, such that we return to the client normally after ConsistencyLevel is achieved, but after RpcTimeout we check the responseHandler write acks and write local hints for any missing targets. This would making disabling RR when HH is enabled a much more reasonable option, which has a huge impact on read throughput. -- This message is automatically generated by JIRA. For more information on JIRA, see: http://www.atlassian.com/software/jira
[jira] [Assigned] (CASSANDRA-2034) Make Read Repair unnecessary when Hinted Handoff is enabled
[ https://issues.apache.org/jira/browse/CASSANDRA-2034?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] Jonathan Ellis reassigned CASSANDRA-2034: - Assignee: Sylvain Lebresne (was: Jonathan Ellis) We should probably make this aggressive HH optional to start with, in case of bugs if nothing else. Or maybe change hinted_handoff_enabled from a bool to a string -- off, old, aggressive. Make Read Repair unnecessary when Hinted Handoff is enabled --- Key: CASSANDRA-2034 URL: https://issues.apache.org/jira/browse/CASSANDRA-2034 Project: Cassandra Issue Type: Improvement Components: Core Reporter: Jonathan Ellis Assignee: Sylvain Lebresne Fix For: 1.0 Original Estimate: 8h Remaining Estimate: 8h Currently, HH is purely an optimization -- if a machine goes down, enabling HH means RR/AES will have less work to do, but you can't disable RR entirely in most situations since HH doesn't kick in until the FailureDetector does. Let's add a scheduled task to the mutate path, such that we return to the client normally after ConsistencyLevel is achieved, but after RpcTimeout we check the responseHandler write acks and write local hints for any missing targets. This would making disabling RR when HH is enabled a much more reasonable option, which has a huge impact on read throughput. -- This message is automatically generated by JIRA. For more information on JIRA, see: http://www.atlassian.com/software/jira
