[jira] [Updated] (CASSANDRA-2103) expiring counter columns

["Yang Yang (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CASSANDRA-2103?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Yang Yang updated CASSANDRA-2103:
---------------------------------

    Comment: was deleted

(was: there could be a problem with trying to rely on forcing compaction order:

if you base the intended order on max timestamp of each sstable, the timestamp is not trustworthy, because a single malicious client request can bump up its timestamp to the future, and arbitrarily change the order of compaction, thus rendering the approach in 2735 useless.

you can't base the order on the physical sstable flush time either, since different nodes have different flush times.

overall I think trying to fix the compaction order is not the correct direction to attack this problem: the issue here is due to the changing order between *individual counter adds/deletes* (auto-expire is same as delete), this order can be different between different counters, so you have to fix the order between the updates within each counter, *not the order between ensembles of counters*. such ensembles of counters do not guarantee any orders at all, due to randomness in flushing time, or message delivery (they have similar effects)

)

> expiring counter columns
> ------------------------
>
>                 Key: CASSANDRA-2103
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-2103
>             Project: Cassandra
>          Issue Type: New Feature
>          Components: Core
>    Affects Versions: 0.8 beta 1
>            Reporter: Kelvin Kakugawa
>         Attachments: 0001-CASSANDRA-2103-expiring-counters-logic-tests.patch
>
>
> add ttl functionality to counter columns.

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