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https://issues.apache.org/jira/browse/ZOOKEEPER-702?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12899947#action_12899947
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Abmar Barros commented on ZOOKEEPER-702:
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Hi Flavio and Ivan.
Thanks for reviewing the patch and posting feedback.
Ivan, totally agreed with your suggestions, I have already been thinking about
some of the issues you have raised also.
I will address the issues you have mentioned and will update the patch asap.
By the way, I would like to thank the ZooKeeper community for such opportunity,
it was a very enriching experience for me, not only as a developer but also as
a researcher. And I plan to keep on contributing to ZK community -- as I have
talked to Flavio previously, next steps include some more experimentation on
the failure detection methods to better characterize them, and writing some
guidelines regarding their usage and their appropriateness for certain
scenarios/deployments.
> 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-code.patch, ZOOKEEPER-702-doc.patch, ZOOKEEPER-702.patch,
> ZOOKEEPER-702.patch, 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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