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From "Andrew Purtell" <apurt...@apache.org>
Subject Review Request: [rest] publish endpoint and statistics into ZooKeeper
Date Mon, 18 Oct 2010 21:46:30 GMT

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This is an automatically generated e-mail. To reply, visit:
http://review.cloudera.org/r/1039/
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Review request for hbase.


Summary
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This change allows the REST interface to publish its endpoint and metrics, currently only
requests/sec, into ZooKeeper. By default a permanent znode tree is created as needed at /hbase/rest/status
and Stargate instances create ephemeral children of this with names in the format <host>:<port>.
The ephemeral znodes contain JSON serialized information about the instance, e.g.

  {"connector":{"host":"restserver.example.com","port":"8080"},"statistics":{"requests":"13"}}

The function of Stargate itself is not affected, except for one significant change: now if
the ZooKeeper service is lost, the Stargate instances will abort along with the rest of HBase.


This addresses bug HBASE-3119.
    http://issues.apache.org/jira/browse/HBASE-3119


Diffs
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  src/main/java/org/apache/hadoop/hbase/HConstants.java 71c3e7b 
  src/main/java/org/apache/hadoop/hbase/rest/Main.java 368b4b4 
  src/main/java/org/apache/hadoop/hbase/rest/RESTServlet.java ed92857 
  src/main/java/org/apache/hadoop/hbase/rest/metrics/RESTMetrics.java 284bbc5 

Diff: http://review.cloudera.org/r/1039/diff


Testing
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Thanks,

Andrew


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