Rakesh Kumar Singh created ZOOKEEPER-2599:
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Summary: Quorum with 3 nodes, stop 2 nodes and let one running,
install and configure new quorum where one node details is common but now has
configuration of new quorum. common node getting synced the configuration with
previous quorum
Key: ZOOKEEPER-2599
URL: https://issues.apache.org/jira/browse/ZOOKEEPER-2599
Project: ZooKeeper
Issue Type: Bug
Affects Versions: 3.5.1
Reporter: Rakesh Kumar Singh
Priority: Critical
Start an quorum with 3 (let say A, B, C) zookeepers, stop 2 zookeepers and let
one running, install and configure new quorum (A, A2, A3, A4, A5) where A is
common but now has configuration of new quorum. When start A, it getting synced
the configuration with previous quorum
Steps to reproduce:-
1. Configure and start quorum of 3 nodes (A, B, C) -> 1st quorum
2. stop 2 nodes and let running 3rd node (say C)
3. Create new quorum of 5 nodes (A, A2, A3, A4, A5) where A has same IP and
port which was used in 1st quorum but A's configuration is as per new quorum
(where details of A, A2, A3, A4, A5) are present and not B & C.
4. Now start 2nd quorum. Here A's dynamic configuration is getting changed
according to 1st quorum
Problems:-
1. Now A node is neither syncing all data with 1st quorum nor with 2nd quorum
2. Big security flaw and the whole quorum can be screwed
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