Alexander Shraer created ZOOKEEPER-1675:
-------------------------------------------
Summary: Make sync a quorum operation
Key: ZOOKEEPER-1675
URL: https://issues.apache.org/jira/browse/ZOOKEEPER-1675
Project: ZooKeeper
Issue Type: Bug
Affects Versions: 3.4.0, 3.5.0
Reporter: Alexander Shraer
sync + read is supposed to return at least the latest write that completes
before the sync starts. This is true if the leader doesn't change, but when it
does it may not work. The problem happens when the old leader L1 still thinks
that it is the leader but some other leader L2 was already elected and
committed some operations. Suppose that follower F is connected to L1 and
invokes a sync. Even though L1 responds to the sync, L2 may have already
committed new operations so a subsequent read on F will not return these
operations.
To prevent this we should broadcast the sync like updates.
This problem is also mentioned in Section 4.4 of the ZooKeeper peper (but the
proposed solution there is insufficient to solve the issue).
--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators
For more information on JIRA, see: http://www.atlassian.com/software/jira
