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https://issues.apache.org/jira/browse/CASSANDRA-5044?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13528097#comment-13528097
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Carl Yeksigian commented on CASSANDRA-5044:
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We only support resizing compaction threads and reader/writer pool size. Also,
we added support to change the number of cores in the yaml:
https://issues.apache.org/jira/browse/CASSANDRA-4790.
We can't resize each pool independently using the yaml file; most of the thread
pool sizes seem fine -- main drivers for this change are the ones that are
configurable in the yaml.
> Allow resizing of threadpools via JMX
> -------------------------------------
>
> Key: CASSANDRA-5044
> URL: https://issues.apache.org/jira/browse/CASSANDRA-5044
> Project: Cassandra
> Issue Type: Improvement
> Components: Core
> Reporter: Carl Yeksigian
> Assignee: Carl Yeksigian
> Priority: Minor
> Fix For: 1.2.1
>
> Attachments: 5044.txt
>
>
> Currently changing the size of threadpools is done using the config files. If
> resizing a threadpool, the node needs to be taken offline.
> Adding resizing via JMX allows online tweaking. TPEs allow for moving the
> number of threads up and down; moving down will take effect after a thread in
> the pool becomes idle.
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