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From Matthieu Morel <>
Subject naming, grouping of messages and topic redistribution in Hedwig
Date Thu, 03 May 2012 10:53:10 GMT

I have a few questions about Hedwig:

-  Are topic names unique across Hedwig instances (spread on different 
datacenters for example)? Is there a naming scheme?

- How can one ensure that a group of messages can be handled atomically 
by Hedwig (in particular 1 message persisted => all messages from the 
group persisted)? One way could be to create a single message containing 
all messages from the group, and send that to Hedwig, but maybe there is 
a better way?

And a feature suggestion (I'll add a Jira if you think it can be 

- when a hub fails, its topics are redistributed to other hubs, but 
would it be possible to control the redistribution? This could be useful 
in order to limit the number of hubs a client would have to connect to 
(in the case all topics are reallocated to distinct hubs). It seems that 
the current logic is in ZkTopicManager and redistribution of topic is 
based on load information gathered from the available hubs. But could 
this be made customizable?



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