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Abmar Barros updated ZOOKEEPER-702: ----------------------------------- Attachment: ZOOKEEPER-702.patch Patch changes are: * Created appMessageReceived() and appMessageSent() methods. These methods allow the Failure Detector to use application messages as heartbeats, which reflects the ZooKeeper case. * Added command line options to configure failure detector method and its parameters. * Unit tests expanded to comply with new methods. * Enhanced javadocs for each Failure Detector implementation * Added commons-math dependency to ivy.xml Next things to work on are: * Adapt server side code to use the proposed FD interface * Start experimenting > 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 > > > 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. -- This message is automatically generated by JIRA. - You can reply to this email to add a comment to the issue online.