Read-Only Mode
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Key: ZOOKEEPER-704
URL: https://issues.apache.org/jira/browse/ZOOKEEPER-704
Project: Zookeeper
Issue Type: Wish
Reporter: Henry Robinson
Read-only mode
Possible Mentor
Henry Robinson (henry at apache dot org)
Requirements
Java and TCP/IP networking
Description
When a ZooKeeper server loses contact with over half of the other servers in an
ensemble ('loses a quorum'), it stops responding to client requests because it
cannot guarantee that writes will get processed correctly. For some
applications, it would be beneficial if a server still responded to read
requests when the quorum is lost, but caused an error condition when a write
request was attempted.
This project would implement a 'read-only' mode for ZooKeeper servers (maybe
only for Observers) that allowed read requests to be served as long as the
client can contact a server.
This is a great project for getting really hands-on with the internals of
ZooKeeper - you must be comfortable with Java and networking otherwise you'll
have a hard time coming up to speed.
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