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https://issues.apache.org/jira/browse/CASSANDRA-14708?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16609045#comment-16609045
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Sylvain Lebresne commented on CASSANDRA-14708:
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bq. Do you have a link to the original discussions around its inclusion

Well, it's not exactly hard to find: CASSANDRA-11873.

> protocol v5 duration wire format is overly complex and awkward to implement 
> for clients
> ---------------------------------------------------------------------------------------
>
>                 Key: CASSANDRA-14708
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-14708
>             Project: Cassandra
>          Issue Type: Bug
>            Reporter: Chris Bannister
>            Priority: Major
>
> Protocol V5 defines the duration type to be on the wire as months, days and 
> nanoseconds. Days and months require a timezone to make sense of the duration 
> and varies depending on from which they are applied for.
>  
> Go defines a [duration|https://golang.org/pkg/time/#Duration] type as 
> nanoseconds in int64 which can represent ~290 years. Java 
> [duration|https://docs.oracle.com/javase/8/docs/api/java/time/Duration.html] 
> does not have way to handle months.
>  
> I suggest that before 4.0 is release the duration format is converted to just 
> be represented as nanoseconds.



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