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From Apache Wiki <wikidi...@apache.org>
Subject [Hadoop Wiki] Update of "HedWig" by mahadevkonar
Date Wed, 17 Nov 2010 22:33:11 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=3&rev2=4

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  Hedwig is a '''publish-subscribe''' system designed to carry large amounts of data across
the internet in a '''guaranteed-delivery''' fashion from those who produce it ('''publishers''')
to those who are interested in it ('''subscribers'''). The goals of Hedwig are:
  
-    1 *Guaranteed Delivery*: The messages may not be lost even when a particular subscriber
goes offline for extended periods of time.
+    1. '''Guaranteed Delivery''': The messages may not be lost even when a particular subscriber
goes offline for extended periods of time.
-    1 *Topic-based*: Publishes and subscribes happen to a topic. The system should scale
to ~10^6 topics with ~10 subscribers on each topic.
+    1. '''Topic-based''': Publishes and subscribes happen to a topic. The system should scale
to ~10^6 topics with ~10 subscribers on each topic.
-    1 *Incremental Scalability*: It should be possible to scale capacity by adding servers
on the fly. The up-front hardware investment should not be huge.
+    1. '''Incremental Scalability''': It should be possible to scale capacity by adding servers
on the fly. The up-front hardware investment should not be huge.
-    1 *High availability*: The system should remain available in the presence of single server
failure without manual intervention. 
+    1. '''High availability''': The system should remain available in the presence of single
server failure without manual intervention. 
  
  While there are a lot of commercial and open-source products in the general pub-sub category,
none of them satisfy all the above 4 requirements (they mostly fail on 3 and 4).
  

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