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E. Sammer commented on ZOOKEEPER-1080: -------------------------------------- I've written a simple library that does exactly this for another project that uses ZK. I haven't read the attached design document attached, but I'm happy to contribute the code anyway, if it's useful. I'll upload it later today for others to review. > Provide a Leader Election framework based on Zookeeper receipe > -------------------------------------------------------------- > > Key: ZOOKEEPER-1080 > URL: https://issues.apache.org/jira/browse/ZOOKEEPER-1080 > Project: ZooKeeper > Issue Type: New Feature > Components: contrib > Affects Versions: 3.3.2 > Reporter: Hari A V > Attachments: LeaderElectionService.pdf > > > Currently Hadoop components such as NameNode and JobTracker are single point > of failure. > If Namenode or JobTracker goes down, there service will not be available > until they are up and running again. If there was a Standby Namenode or > JobTracker available and ready to serve when Active nodes go down, we could > have reduced the service down time. Hadoop already provides a Standby > Namenode implementation which is not fully a "hot" Standby. > The common problem to be addressed in any such Active-Standby cluster is > Leader Election and Failure detection. This can be done using Zookeeper as > mentioned in the Zookeeper recipes. > http://zookeeper.apache.org/doc/r3.3.3/recipes.html > +Leader Election Service (LES)+ > Any Node who wants to participate in Leader Election can use this service. > They should start the service with required configurations. The service will > notify the nodes whether they should be started as Active or Standby mode. > Also they intimate any changes in the mode at runtime. All other complexities > can be handled internally by the LES. -- This message is automatically generated by JIRA. For more information on JIRA, see: http://www.atlassian.com/software/jira