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Chapter 13. JMX References
13.1. JBoss Cache Statistics
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There is a whole wealth of information being gathered and exposed on to JMX for monitoring the cache. Some of these are detailed below:
| MBean | Attribute/Operation Name | Description |
|---|---|---|
| DataContainerImpl | getNumberOfAttributes() | Returns the number of attributes in all nodes in the data container |
| getNumberOfNodes() | Returns the number of nodes in the data container | |
| printDetails() | Prints details of the data container | |
| RPCManagerImpl | localAddressString | String representation of the local address |
| membersString | String representation of the cluster view | |
| statisticsEnabled | Whether RPC statistics are being gathered | |
| replicationCount | Number of successful replications | |
| replicationFailures | Number of failed replications | |
| successRatio | RPC call success ratio | |
| RegionManagerImpl | dumpRegions() | Dumps a String representation of all registered regions, including eviction regions depicting their event queue sizes |
| numRegions | Number of registered regions | |
| BuddyManager | buddyGroup | A String representation of the cache's buddy group |
| buddyGroupsIParticipateIn | String representations of all buddy groups the cache participates in | |
| TransactionTable | numberOfRegisteredTransactions | The number of registered, ongoing transactions |
| transactionMap | A String representation of all currently registered transactions mapped to internal GlobalTransaction instances | |
| MVCCLockManager | concurrencyLevel | The configured concurrency level |
| numberOfLocksAvailable | Number of locks in the shared lock pool that are not used | |
| numberOfLocksHeld | Number of locks in the shared lock pool that are in use | |
| testHashing(String fqn) | Tests the spreading of locks across Fqns. For a given (String based) Fqn, this method returns the index in the lock array that it maps to. | |
| ActivationInterceptor | Activations | Number of passivated nodes that have been activated. |
| CacheLoaderInterceptor | CacheLoaderLoads | Number of nodes loaded through a cache loader. |
| CacheLoaderMisses | Number of unsuccessful attempts to load a node through a cache loader. | |
| CacheMgmtInterceptor | Hits | Number of successful attribute retrievals. |
| Misses | Number of unsuccessful attribute retrievals. | |
| Stores | Number of attribute store operations. | |
| Evictions | Number of node evictions. | |
| NumberOfAttributes | Number of attributes currently cached. | |
| NumberOfNodes | Number of nodes currently cached. | |
| ElapsedTime | Number of seconds that the cache has been running. | |
| TimeSinceReset | Number of seconds since the cache statistics have been reset. | |
| AverageReadTime | Average time in milliseconds to retrieve a cache attribute, including unsuccessful attribute retrievals. | |
| AverageWriteTime | Average time in milliseconds to write a cache attribute. | |
| HitMissRatio | Ratio of hits to hits and misses. A hit is a get attribute operation that results in an object being returned to the client. The retrieval may be from a cache loader if the entry isn't in the local cache. | |
| ReadWriteRatio | Ratio of read operations to write operations. This is the ratio of cache hits and misses to cache stores. | |
| CacheStoreInterceptor | CacheLoaderStores | Number of nodes written to the cache loader. |
| InvalidationInterceptor | Invalidations | Number of cached nodes that have been invalidated. |
| PassivationInterceptor | Passivations | Number of cached nodes that have been passivated. |
| TxInterceptor | Prepares | Number of transaction prepare operations performed by this interceptor. |
| Commits | Number of transaction commit operations performed by this interceptor. | |
| Rollbacks | Number of transaction rollbacks operations performed by this interceptor. | |
| numberOfSyncsRegistered | Number of synchronizations registered with the transaction manager pending completion and removal. |
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