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From Apache Wiki <wikidi...@apache.org>
Subject [Hadoop Wiki] Update of "HedWig" by mahadevkonar
Date Wed, 17 Nov 2010 22:36:11 GMT
Dear Wiki user,

You have subscribed to a wiki page or wiki category on "Hadoop Wiki" for change notification.

The "HedWig" page has been changed by mahadevkonar.
http://wiki.apache.org/hadoop/HedWig?action=diff&rev1=7&rev2=8

--------------------------------------------------

  
  {{attachment:hedwig.png}}
  
- <hline>
- 
- Now digging down into a region, it consists of a collection of *hub servers*. Hub servers
aggregate messages published in a region and persist them. They also subscribe to hubs in
other regions to listen for messages that their clients are subscribed to. Clients always
subscribe only to  local hub servers. Hedwig plans to use [[http://hadoop.apache.org/zookeeper/][Zookeeper]]
for persistence of metadata, and [[https://issues.apache.org/jira/browse/ZOOKEEPER-276][Bookkeeper]]
for persistence of actual messages.
+ Now digging down into a region, it consists of a collection of '''hub servers'''. Hub servers
aggregate messages published in a region and persist them. They also subscribe to hubs in
other regions to listen for messages that their clients are subscribed to. Clients always
subscribe only to  local hub servers. Hedwig plans to use [[http://hadoop.apache.org/zookeeper/][Zookeeper]]
for persistence of metadata, and [[https://issues.apache.org/jira/browse/ZOOKEEPER-276][Bookkeeper]]
for persistence of actual messages.
  
  <center>
  <img src="%ATTACHURLPATH%/region.png" width="500"/>

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