Failure Detector Model
----------------------
Key: ZOOKEEPER-702
URL: https://issues.apache.org/jira/browse/ZOOKEEPER-702
Project: Zookeeper
Issue Type: Wish
Reporter: Henry Robinson
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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