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https://issues.apache.org/jira/browse/DERBY-6733?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Knut Anders Hatlen updated DERBY-6733:
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Attachment: d6733-1a-page-and-container.diff
Attaching [^d6733-1a-page-and-container.diff] which is a refinement of the
experimental patches attached to DERBY-5772. It adds a new MBean called
CacheManagerMBean, and creates instances of it for the page cache and the
container cache when a database is booted.
The MBean has the following attributes:
- CollectAccessCounts (boolean, read/write): tells the MBean whether or not all
cache accesses should be counted (default is off)
- HitCount (long, read-only): number of cache hits counted
- MissCount (long, read-only): number of cache misses counted
- EvictionCount (long, read-only): number of evictions from the cache
- MaxEntries (long, read-only): the maximum capacity of the cache
- AllocatedEntries (long, read-only): the number of entries in the cache (this
number includes objects that have been removed from the cache, but whose
entries have not been reused by other objects yet)
- UsedEntries (long, read-only): the number of entries in the cache that
actually correspond to a valid object
The patch also adds a new regression test (CacheManagerMBeanTest) with basic
functional tests for the new MBean.
All regression tests passed with the patch.
> Implement an MBean for monitoring caches
> ----------------------------------------
>
> Key: DERBY-6733
> URL: https://issues.apache.org/jira/browse/DERBY-6733
> Project: Derby
> Issue Type: Improvement
> Components: JMX
> Affects Versions: 10.12.0.0
> Reporter: Knut Anders Hatlen
> Assignee: Knut Anders Hatlen
> Attachments: d6733-1a-page-and-container.diff
>
>
> Add an MBean that allows users to monitor Derby's CacheFactory instances, as
> discussed in DERBY-5772.
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