[Cassandra Wiki] Trivial Update of HarryV6 by HarryV6

2012-09-30 Thread Apache Wiki 
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New page:
Not much to write about myself at all.BREnjoying to be a part of 
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[[http://www.sbwire.com/press-releases/tag-away-the-all-natural-skin-tag-remover-166957.htm|just
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[jira] [Commented] (CASSANDRA-4705) Speculative execution for CL_ONE

2012-09-30 Thread Jonathan Ellis (JIRA) 

[ 
https://issues.apache.org/jira/browse/CASSANDRA-4705?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanelfocusedCommentId=13466559#comment-13466559
 ] 

Jonathan Ellis commented on CASSANDRA-4705:
---

Well, we have a pretty short list of possibilities from metrics...  I guess we 
could add auto95, auto97, auto99 options?

 Speculative execution for CL_ONE
 

 Key: CASSANDRA-4705
 URL: https://issues.apache.org/jira/browse/CASSANDRA-4705
 Project: Cassandra
  Issue Type: Improvement
Affects Versions: 1.2.0
Reporter: Vijay
Assignee: Vijay
Priority: Minor

 When read_repair is not 1.0, we send the request to one node for some of the 
 requests. When a node goes down or when a node is too busy the client has to 
 wait for the timeout before it can retry. 
 It would be nice to watch for latency and execute an additional request to a 
 different node, if the response is not received within average/99% of the 
 response times recorded in the past.
 CASSANDRA-2540 might be able to solve the variance when read_repair is set to 
 1.0
 1) May be we need to use metrics-core to record various Percentiles
 2) Modify ReadCallback.get to execute additional request speculatively.

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