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From Apache Wiki <wikidi...@apache.org>
Subject [Hadoop Wiki] Update of "HedWig/TopicManagement" by ErwinTam
Date Tue, 11 Jan 2011 19:22:00 GMT
Dear Wiki user,

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The "HedWig/TopicManagement" page has been changed by ErwinTam.


                 * If the ephemeral node creation succeeds, then H1 will set up its internal
bookkeeping to begin delivering messages to C.
                 * Otherwise (ephemeral node creation fails) then H1 will read the hostname
(e.g. H3) of the hub assigned to the topic from the '''T.Hub''' node, and return to the client
a ''redirect'' message, requesting that the client retry its subscription at H3.
+ ==== Notes: ====
- Notes:
     * Because we want subscribers to be directly connected to the hub responsible for the
topic, we will redirect the client to that hub.
     * Because the '''T.Hub''' node is ephemeral, it must be created by the hub that owns
the topic, not by any other hub.
     * To decide which hub to assign a topic to, the deciding hub should use the current list
of alive nodes from '''Hedwig.Hubs''' in ZooKeeper.

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