[jira] Commented: (ZOOKEEPER-702) GSoC 2010: Failure Detector Model

["Abmar Barros (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/ZOOKEEPER-702?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12898471#action_12898471 ] 

Abmar Barros commented on ZOOKEEPER-702:
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I was thinking of adding a new parameter to the adaptive methods, that is the minimum window size to begin performing timeout adaptation. As we noticed, adaptive methods can get benefit of a large window size, and there can be premature false suspicion if we do not know the behaviour of the network. In this case, the methods will start using a static timeout until the window reaches a certain size. What do you think?

> GSoC 2010: Failure Detector Model
> ---------------------------------
>
>                 Key: ZOOKEEPER-702
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-702
>             Project: Zookeeper
>          Issue Type: Wish
>            Reporter: Henry Robinson
>            Assignee: Abmar Barros
>         Attachments: bertier-pseudo.txt, bertier-pseudo.txt, chen-pseudo.txt, chen-pseudo.txt, phiaccrual-pseudo.txt, phiaccrual-pseudo.txt, ZOOKEEPER-702.patch, ZOOKEEPER-702.patch, ZOOKEEPER-702.patch, ZOOKEEPER-702.patch, ZOOKEEPER-702.patch, ZOOKEEPER-702.patch, ZOOKEEPER-702.patch, ZOOKEEPER-702.patch
>
>
> Failure Detector Module
> Possible Mentor
> Henry Robinson (henry at apache dot org)
> Requirements
> Java, some distributed systems knowledge, comfort implementing distributed systems protocols
> Description
> ZooKeeper servers detects the failure of other servers and clients by counting the number of 'ticks' for which it doesn't get a heartbeat from other machines. This is the 'timeout' method of failure detection and works very well; however it is possible that it is too aggressive and not easily tuned for some more unusual ZooKeeper installations (such as in a wide-area network, or even in a mobile ad-hoc network).
> This project would abstract the notion of failure detection to a dedicated Java module, and implement several failure detectors to compare and contrast their appropriateness for ZooKeeper. For example, Apache Cassandra uses a phi-accrual failure detector (http://ddsg.jaist.ac.jp/pub/HDY+04.pdf) which is much more tunable and has some very interesting properties. This is a great project if you are interested in distributed algorithms, or want to help re-factor some of ZooKeeper's internal code.

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