incubator-s4-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Karthik Kambatla (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (S4-7) Netty to tolerate network glitches and connection loss
Date Thu, 09 Feb 2012 18:07:59 GMT

    [ https://issues.apache.org/jira/browse/S4-7?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13204700#comment-13204700
] 

Karthik Kambatla commented on S4-7:
-----------------------------------

The piper branch suffers from the same issue - firstly, the piper branch does not have multi-partition
tests; after adding the support, I notice the same synchronization issues.

One possible issue could be the use of a simple list in topology.Cluster - a good place to
start might be to modify the List to a HashBiMap to make sure we are not re-mapping by mistake.
Also, that would let us support removing nodes in the event of failures and reassigning the
partition to a new node.

Thoughts?
                
> Netty to tolerate network glitches and connection loss
> ------------------------------------------------------
>
>                 Key: S4-7
>                 URL: https://issues.apache.org/jira/browse/S4-7
>             Project: Apache S4
>          Issue Type: Bug
>            Reporter: Leo Neumeyer
>            Assignee: Karthik Kambatla
>             Fix For: 0.5
>
>         Attachments: S4-7-Robust-TCPEmitter-asynchronous-ordered.patch, s4-7.patch, s4-7.patch
>
>
> NettyEmitter connects to different partitions and creates channels over which it communicates
to other listeners.
> It suffers from the following issues -- 
> 1. If the underlying topology changes, the channels and the associated connections are
not updated.
> 2. If a connection gets disconnected, it stays disconnected.
> 3. If for any reason, a connection can't be made, send() drops the message to be sent.
> The solution is to - 
> 1. Maintain a bounded messageQueue for each destination partition - if a connection does
not exist, the message should be queued.
> 2. Maintain a map of the channel used for each destination partition - update this map
on changes to topology, or on send() in case of disconnections.
> 3. Every time a (re-)connection is made, send the queued messages first.

--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa
For more information on JIRA, see: http://www.atlassian.com/software/jira

        

Mime
View raw message