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From "Jonathan Ellis (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CASSANDRA-5025) Schema push/pull race
Date Tue, 04 Dec 2012 17:53:59 GMT
Jonathan Ellis created CASSANDRA-5025:
-----------------------------------------

             Summary: Schema push/pull race
                 Key: CASSANDRA-5025
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-5025
             Project: Cassandra
          Issue Type: Bug
          Components: Core
    Affects Versions: 1.1.0
            Reporter: Jonathan Ellis
            Priority: Minor
             Fix For: 1.1.8


When a schema change is made, the coordinator pushes the delta to the other nodes in the cluster.
 This is more efficient than sending the entire schema.  But the coordinator also announces
the new schema version, so the other nodes' reception of the new version races with processing
the delta, and usually seeing the new schema wins.  So the other nodes also issue a pull to
the coordinator for the entire schema.

Thus, schema changes tend to become O(n) in the number of KS and CF present.

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