C*2.1 using timestamp with same timestamp

[ae...@orange.com]

Hello,

I try to insert two lines for the same partition with the same timestamp. prmiere the line without TTL. the 2nd line with TTL.
As shown in the example below:

INSERT INTO tab1 (a,b) VALUES ('YYY','XXXX') USING TIMESTAMP 1460088862025940
INSERT INTO tab1 (a,b) VALUES ('YYY','XXXX') USING TIMESTAMP 1460088862025940 AND TTL 1000

With C*2.0, when I select from the table, I get the row with the TTL (), therefore the second row

a        | b | ttl(b) | writetime(b)
------------+----------------+---------------------+---------------------------
YYY |         XXXX|                 999 |          1460088862025940

but with C*2.1 for the same insertions I get the row without TTL, therefore the first row.

a        | b | ttl(b) | writetime(b)
------------+----------------+---------------------+---------------------------
YYY |         XXXX|                 null |          1460088862025940

I know it is related to the WriteTime except that I do not understand the difference between 2.0 and 2.1 in this case

Any idea ?

Thx.

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