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https://issues.apache.org/jira/browse/CASSANDRA-11368?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15344546#comment-15344546
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Ngoc Minh Vo commented on CASSANDRA-11368:
------------------------------------------
Hello,
We encounter the same issue randomly on our production setup with two
datacenters using C* v2.0.14. No problem on one-datacenter UAT environment.
I believe that coordinator node sends insert query to two datacenters with the
same timestamp. Hence, data spreading process inter-datacenter could lead to
duplicated values in list.
Two possible solutions:
1. use "map<Integer, V>" with keys corresponding to the value indexes (i.e.: 0,
1, 2, ... N)
2. use blob to store all list values and perform deserialization on client side
(via DAO layer for instance)
Any other recommendation?
Thanks for your help.
Minh
> Lists inserts are not truly idempotent
> --------------------------------------
>
> Key: CASSANDRA-11368
> URL: https://issues.apache.org/jira/browse/CASSANDRA-11368
> Project: Cassandra
> Issue Type: Bug
> Components: Core
> Reporter: Thanh
>
> List of UDT can't be updated properly when using USING TIMESTAMP
> Observe:
> {code}
> cqlsh:t360> CREATE TYPE fullname (
> ... fname text,
> ... lname text
> ... );
> cqlsh:t360> CREATE TABLE users (
> ... id text PRIMARY KEY,
> ... names list<frozen <fullname>>,
> ... phone text
> ... );
> cqlsh:t360> UPDATE users USING TIMESTAMP 1458019725701 SET names = [{ fname:
> 'fname1', lname: 'lname1'},{ fname: 'fname2', lname: 'lname2'},{ fname:
> 'fname3', lname: 'lname3'}] WHERE id='a';
> cqlsh:t360> select * from users;
> id | names | phone
> ----+--------------------------------------------------------------------------------------------------------------+-------
>
> a | [{lname: 'lname1', fname: 'fname1'}, {lname: 'lname2', fname: 'fname2'},
> {lname: 'lname3', fname: 'fname3'}] | null
> (1 rows)
> cqlsh:t360> UPDATE users USING TIMESTAMP 1458019725701 SET names = [{ fname:
> 'fname1', lname: 'lname1'},{ fname: 'fname2', lname: 'lname2'},{ fname:
> 'fname3', lname: 'lname3'}] WHERE id='a';
> cqlsh:t360> select * from users;
> id | names | phone
> ----+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+-------
>
> a | [{lname: 'lname1', fname: 'fname1'}, {lname: 'lname2', fname: 'fname2'},
> {lname: 'lname3', fname: 'fname3'}, {lname: 'lname1', fname: 'fname1'},
> {lname: 'lname2', fname: 'fname2'}, {lname: 'lname3', fname: 'fname3'}] | null
> (1 rows)
> {code}
> => the list doesn't get replaced, it gets appended, which is not the
> expected/desired result
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