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Posted to commits@cassandra.apache.org by "Vijay (Created) (JIRA)" <ji...@apache.org> on 2011/11/26 03:00:39 UTC
[jira] [Created] (CASSANDRA-3534) Enhance memory emergency pressure
valve
Enhance memory emergency pressure valve
---------------------------------------
Key: CASSANDRA-3534
URL: https://issues.apache.org/jira/browse/CASSANDRA-3534
Project: Cassandra
Issue Type: Improvement
Components: Core
Affects Versions: 1.1
Reporter: Vijay
Assignee: Vijay
Priority: Minor
Seems like when these thresholds are reached we are trying to reduce the keycache and Memtable sizes, but in the trunk memtable is moved off-heap hence reducing that will not actually help.
Reducing the keycache might help but we might want to provide a way to bring the cache level back to the configured value when the pressure goes away.
Conversation from IRC: we might want to remove these setting all together after global keycache.
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[jira] [Commented] (CASSANDRA-3534) Enhance memory emergency
pressure valve
Posted by "Jonathan Ellis (Commented) (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/CASSANDRA-3534?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13157391#comment-13157391 ]
Jonathan Ellis commented on CASSANDRA-3534:
-------------------------------------------
Then you will be able to say "use X amount of memory for memtables, Y amount for the cache (and monitor Z amount for the bloom filters)" which makes the old "pressure valve" code obsolete.
> Enhance memory emergency pressure valve
> ---------------------------------------
>
> Key: CASSANDRA-3534
> URL: https://issues.apache.org/jira/browse/CASSANDRA-3534
> Project: Cassandra
> Issue Type: Improvement
> Components: Core
> Affects Versions: 1.1
> Reporter: Vijay
> Assignee: Vijay
> Priority: Minor
>
> Seems like when these thresholds are reached we are trying to reduce the keycache and Memtable sizes, but in the trunk memtable is moved off-heap hence reducing that will not actually help.
> Reducing the keycache might help but we might want to provide a way to bring the cache level back to the configured value when the pressure goes away.
> Conversation from IRC: we might want to remove these setting all together after global keycache.
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[jira] [Updated] (CASSANDRA-3534) Enhance memory emergency pressure
valve
Posted by "Vijay (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/CASSANDRA-3534?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Vijay updated CASSANDRA-3534:
-----------------------------
Assignee: (was: Vijay)
> Enhance memory emergency pressure valve
> ---------------------------------------
>
> Key: CASSANDRA-3534
> URL: https://issues.apache.org/jira/browse/CASSANDRA-3534
> Project: Cassandra
> Issue Type: Improvement
> Components: Core
> Affects Versions: 1.1.0
> Reporter: Vijay
> Priority: Minor
>
> Seems like when these thresholds are reached we are trying to reduce the keycache and Memtable sizes, but in the trunk memtable is moved off-heap hence reducing that will not actually help.
> Reducing the keycache might help but we might want to provide a way to bring the cache level back to the configured value when the pressure goes away.
> Conversation from IRC: we might want to remove these setting all together after global keycache.
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[jira] [Commented] (CASSANDRA-3534) Enhance memory emergency
pressure valve
Posted by "Jonathan Ellis (Commented) (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/CASSANDRA-3534?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13157390#comment-13157390 ]
Jonathan Ellis commented on CASSANDRA-3534:
-------------------------------------------
Yes, I think the right approach is to remove this code once CASSANDRA-3143 is done.
> Enhance memory emergency pressure valve
> ---------------------------------------
>
> Key: CASSANDRA-3534
> URL: https://issues.apache.org/jira/browse/CASSANDRA-3534
> Project: Cassandra
> Issue Type: Improvement
> Components: Core
> Affects Versions: 1.1
> Reporter: Vijay
> Assignee: Vijay
> Priority: Minor
>
> Seems like when these thresholds are reached we are trying to reduce the keycache and Memtable sizes, but in the trunk memtable is moved off-heap hence reducing that will not actually help.
> Reducing the keycache might help but we might want to provide a way to bring the cache level back to the configured value when the pressure goes away.
> Conversation from IRC: we might want to remove these setting all together after global keycache.
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