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https://issues.apache.org/jira/browse/CASSANDRA-8123?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14172449#comment-14172449
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Sylvain Lebresne commented on CASSANDRA-8123:
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bq. I understand what is causing it, but I think the behavior is unexpected

We're not disagreeing with you, but given how things are working internally, we 
don't know how to fix it currently. Once we've fixed CASSANDRA-6123, we might 
be able to fix that too, but before that this will have to be a known gotcha. 
Unless you have an actual solution to fix this (that don't involve entirely 
redisigning the internal list implementation preferably)?

> List appends when inserting in the same value
> ---------------------------------------------
>
>                 Key: CASSANDRA-8123
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-8123
>             Project: Cassandra
>          Issue Type: Bug
>         Environment: C* 2.1.0 and C* 2.0.10
>            Reporter: Jorge Bay
>            Priority: Minor
>
> List append when inserting in the same value
> I'm getting list appends when executing multiple times concurrently an INSERT 
> (or update) of a list column value on the same partition:
> "INSERT INTO cf1 VALUES (id, list_sample) VALUES (id1, ['one', 'two']);"
> It could result into a list with the values appended: ['one', 'two', 'one', 
> 'two', ...]



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