Is the data corrupted exactly the same way on all three nodes and in both
data centers, or just on one or two nodes or in only one data center?
Are both columns doubled in the same row, or only one of them in a
particular row?
Does sound like a bug though, worthy of a Jira ticket.
-- Jack Krupansky
On Wed, Nov 25, 2015 at 4:05 AM, Ngoc Minh VO <ngocminh...@bnpparibas.com>
wrote:
> Hello all,
>
>
>
> We encounter an issue on our Production environment that cannot be
> reproduced on Test environment: list<T> (T = double or text) value is
> randomly “multiplied” by 2 (i.e. value sent to C*= [a, b, c], value stored
> in C* = [a, b, c, a, b, c]).
>
>
>
> I know that it sounds weird but we just want to know whether it is a known
> issue (found nothing with Google…). We are working on a small dataset to
> narrow down issue with log data and maybe create a ticket in for DataStax
> Java Driver or Cassandra teams.
>
>
>
> Cassandra v2.0.14
>
> DataStax Java Driver v2.1.7.1
>
> OS RHEL6
>
> Prod Cluster topology = 16 nodes over 2 datacenters (RF = 3 per DC)
>
> UAT Cluster topology = 6 nodes on 1 datacenter (RF = 3)
>
>
>
> The only difference between Prod and UAT cluster is the multi-datacenter
> mode on Prod one.
>
> We do not insert twice the same data on the same column of any specific
> row. All inserts/updates are idempotent!
>
>
>
> Data table:
>
> CREATE TABLE data (
>
> field1 text,
>
> field2 int,
>
> field3 text,
>
> field4 double,
>
> field5 list<double>, -- randomly having corrupted data, containing [1,
> 2, 3, 1, 2, 3] instead of [1, 2, 3]
>
> field6 text,
>
> field7 list<text>, -- randomly having corrupted data, containing [a,
> b, c, a, b, c] instead of [a, b, c]
>
> PRIMARY KEY ((field1, field2), field3)
>
> ) WITH compaction = { 'class' : 'LeveledCompactionStrategy' };
>
>
>
> Thanks in advance for your help.
>
> Best regards,
>
> Minh
>
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