Provide a Leader Election framework based on Zookeeper receipe
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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
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.
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