[
https://issues.apache.org/jira/browse/CASSANDRA-48?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12695481#action_12695481
]
Sandeep Tata commented on CASSANDRA-48:
---------------------------------------
Say we have 2 processes doing test-and-set.
Read X Read X
T&S X +1 T&S X+2
The two T&S are routed to A , B, C:
@A T&S X + 1
@B T&S X+2
@C T&S X+2
@A T&S X+2 <------Fail, A already updated X
@B T&S X+1 <---- fail
@C T&S X+2 <---- fail
X+1 fails, X+2 succeeds.
A contains a bad value that can be repaired by majority read. Any holes ?
> test-and-set
> ------------
>
> Key: CASSANDRA-48
> URL: https://issues.apache.org/jira/browse/CASSANDRA-48
> Project: Cassandra
> Issue Type: Improvement
> Reporter: Jonathan Ellis
>
> Atomic test-and-set insert operation would be nice: "set value to X but only
> if the current value is still Y." This allows a sort of optimistic
> consistency: perform a GET, then perform test-and-set with the value of that
> GET as Y.
> I do not think that this requires strong consistency to be useful.
--
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.
