Benjamin Reed updated ZOOKEEPER-417:

    Assignee: Benjamin Reed
      Status: Patch Available  (was: Open)

> stray message problem when changing servers
> -------------------------------------------
>                 Key: ZOOKEEPER-417
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-417
>             Project: Zookeeper
>          Issue Type: Bug
>            Reporter: Benjamin Reed
>            Assignee: Benjamin Reed
>            Priority: Blocker
>             Fix For: 3.2.0
>         Attachments: ZOOKEEPER-417.patch, ZOOKEEPER-417.patch, 
> ZOOKEEPER-417.patch, ZOOKEEPER-417.patch
> There is  a possibility for stray messages from a previous connection to 
> violate ordering and generally cause problems. Here is a scenario: we have a 
> client, C, two followers, F1 and F2, and a leader, L. The client is connected 
> to F1, which is a slow follower. C sends setData("/a", "1") to F1 and then 
> loses the connection, so C reconnects to F2 and sends setData("/a", "2").  it 
> is possible, if F1 is slow enough and the setData("/a", "1") got onto the 
> network before the connection break, for F1 to forward the setData("/a", "1") 
> to L after F2 forwards setData("/a", "2").
> to fix this, the leader should keep track of which follower last registered a 
> session for a client and drop any requests from followers for clients for 
> whom they do not have a registration. 

This message is automatically generated by JIRA.
You can reply to this email to add a comment to the issue online.

Reply via email to