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https://issues.apache.org/jira/browse/CASSANDRA-12767?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15564173#comment-15564173
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Ye Liang commented on CASSANDRA-12767:
--------------------------------------

Thank you very much,I specify a server-side timestamp generator to solve this 
problem.
I notice that when i use a client-side timestamp generator,the cassandra driver 
still attach a server-side timestamp to my insert request(with ifnotexist),i 
want to know when will this timestamp be replaced to a server-side timestamp.I 
think it will be replaced in cassandra server side,if true,can you tell me the 
source code segment about this in Cassandra2.1.15 source code?

> Cassandra Java Driver 3.1.0 Client-Side timestamp generation issue
> ------------------------------------------------------------------
>
>                 Key: CASSANDRA-12767
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-12767
>             Project: Cassandra
>          Issue Type: Bug
>         Environment: Cassandra 2.1.15
> Cassandra Java Driver 3.1.0
>            Reporter: Ye Liang
>            Priority: Minor
>
> I use cassandra driver java to do some insert operation.I notice that 
> Cassandra Java Driver use client-side timestamp as default.
> I make my client server one hour ahead than my cassandra server,then i insert 
> some record to an exist table and use sstable2json tool to check my record ' 
> s timestamp.
> i find out that if i insert a record with ifnotexist,the record's timestamp 
> used server-side timestamp,otherwise it use client-side timestamp.
> I think this is a very strange result.



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