[ https://issues.apache.org/jira/browse/ZOOKEEPER-1675?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Michael Han reassigned ZOOKEEPER-1675: -------------------------------------- Assignee: Michael Han > 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 > Assignee: Michael Han > Priority: Major > > 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, the recent operations > committed by L2 will not be flushed to F so a subsequent read on F will not > see 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 was sent by Atlassian JIRA (v7.6.14#76016)