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Flavio Junqueira commented on ZOOKEEPER-702: -------------------------------------------- Abmar, A few comments: # Unit tests are not running properly for me. It is running very slowly and I'm not sure what's causing it. It looks like you've been running on Windows. It would be good to also test on a Unix platform. I'm on MacOS 10.5.6, Java(TM) SE Runtime Environment (build 1.6.0_20-b02-279-9M3165); # We don't have changes for the C client, right? We need make sure that the documentation says that the C client must currently use the default detector and open a jira to fix it; # Please consider splitting the patch into multiple files to make it easier on other folks to review your work. > 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, 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.