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From "Michael Penick (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-7816) Updated the "4.2.6. EVENT" section in the binary protocol specification
Date Fri, 22 Aug 2014 16:08:11 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-7816?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14107017#comment-14107017
] 

Michael Penick commented on CASSANDRA-7816:
-------------------------------------------

Yes, I've seen multiple UP/DOWN messages sent for the same event (I haven't tried other events
yet). At first, I thought it was a bug in my driver, but was unable to determine the cause
so I checked the java-driver:

https://github.com/datastax/java-driver/blob/2.0/driver-core/src/main/java/com/datastax/driver/core/Host.java#L217-L219
https://github.com/datastax/java-driver/blob/2.1/driver-core/src/main/java/com/datastax/driver/core/Host.java#L219-L221

I figured it might be a side effect of C*'s distributed design and the gossip protocol so
it didn't seem unreasonable. I haven't dug into the server-side code yet to officially confirm
why that's happening. I think it makes sense to have a note in the protocol specification
if this is determined to be part of normal operating behavior.


> Updated the "4.2.6. EVENT" section in the binary protocol specification
> -----------------------------------------------------------------------
>
>                 Key: CASSANDRA-7816
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-7816
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Documentation & website
>            Reporter: Michael Penick
>            Priority: Trivial
>         Attachments: trunk-7816.txt
>
>
> Added "MOVED_NODE" as a possible type of topology change and also specified that it is
possible to receive the same event multiple times.



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