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From "Chris Herron (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-5025) Schema push/pull race
Date Fri, 07 Dec 2012 16:51:21 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-5025?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13526533#comment-13526533
] 

Chris Herron commented on CASSANDRA-5025:
-----------------------------------------

>From discussion on #cassandra-dev with [~brandon.williams], StorageServer.joinTokenRing
could use Schema.emptyVersion as Schema UUID in order to allow the maybeScheduleSchemaPull
delay to be skipped. Patch to follow...
                
> 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
>            Assignee: Jonathan Ellis
>            Priority: Minor
>             Fix For: 1.1.8
>
>         Attachments: 5025.txt, 5025-v2.txt
>
>
> 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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