[
https://issues.apache.org/jira/browse/CASSANDRA-1461?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12906062#action_12906062
]
Jeremy Hanna commented on CASSANDRA-1461:
-----------------------------------------
it might also be nice to make these settings update-able via JMX. That way, if
the server is bogged down, an admin could disable rows_cached or limit the
number of keys_cached. Both would need to be immediately update-able. So it
would need to probably update the global capacity value for those caches to
appropriate values - 0 for rows_cached, some other limit for keys_cached. That
way the actual cache data structure could be reduced and the memory could be
reclaimed.
> Make rows_cached and keys_cached globally override-able
> -------------------------------------------------------
>
> Key: CASSANDRA-1461
> URL: https://issues.apache.org/jira/browse/CASSANDRA-1461
> Project: Cassandra
> Issue Type: Improvement
> Components: Core
> Reporter: Jeremy Hanna
> Assignee: Jeremy Hanna
>
> It would be nice to make rows_cached and keys_cached globally override-able.
> rows_cached - options to disable globally
> It would be nice to have a setting to be able to globally disable the
> rows_cached setting. In a system where there are multiple users/applications
> on a single cassandra cluster, rows_cached can become unmanageable in its
> current form. It's just too memory intensive and with competing applications
> on a single cluster, it's hard to guarantee isolation and QoS.
> keys_cached - option to have a global limit override
> When there are multiple users/application, even the keys_cached could
> potentially get out of control. So it would be nice to be able give an
> overall limit on how many keys can be cached per column family or possibly a
> total for the keyspace, as keyspace usually translates into a specific
> application. So once the column family has reached the global limit, it
> would just stay at that limit.
--
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.
