Chapter 14. Locking
Red Hat JBoss Data Grid provides locking mechanisms to prevent dirty reads (where a transaction reads an outdated value before another transaction has applied changes to it) and non-repeatable reads.
14.1. Configure Locking (Remote Client-Server Mode)
In Remote Client-Server mode, locking is configured using the
locking element within the cache tags (for example, invalidation-cache, distributed-cache, replicated-cache or local-cache).
Note
The default isolation mode for the Remote Client-Server mode configuration is
READ_COMMITTED. If the isolation attribute is included to explicitly specify an isolation mode, it is ignored, a warning is thrown, and the default value is used instead.
The following is a sample procedure of a basic locking configuration for a default cache in Red Hat JBoss Data Grid's Remote Client-Server mode.
Procedure 14.1. Configure Locking (Remote Client-Server Mode)
Set the
acquire-timeoutParameterTheacquire-timeoutparameter specifies the number of milliseconds after which lock acquisition will time out.<distributed-cache> <locking acquire-timeout="30000" />
Set Number of Lock Stripes
Theconcurrency-levelparameter defines the number of lock stripes used by the LockManager.<distributed-cache> <locking acquire-timeout="30000" concurrency-level="1000" />
Set Lock Striping
Thestripingparameter specifies whether lock striping will be used for the local cache.<distributed-cache> <locking acquire-timeout="30000" concurrency-level="1000" striping="false" /> ... </distributed-cache>
