Chapter 10. 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Red Hat JBoss Data Grid provides locking mechanisms to prevent dirty reads (where a transaction reads an outdated value before another transaction has applied changes to it) and non-repeatable reads.

10.1. 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).
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 10.1. Configure Locking (Remote Client-Server Mode)

  1. Define the Isolation Level

    The isolation parameter defines the isolation level used for the local cache. Valid values for this parameter are REPEATABLE_READ and READ_COMMITTED.
    <distributed-cache>
    	<locking isolation="REPEATABLE_READ" />
    
  2. Set the acquire-timeout Parameter

    The acquire-timeout parameter specifies the number of milliseconds after which lock acquisition will time out.
    <distributed-cache>
    	<locking isolation="REPEATABLE_READ" 
    	         acquire-timeout="30000" />
    
  3. Set Number of Lock Stripes

    The concurrency-level parameter defines the number of lock stripes used by the LockManager.
    <distributed-cache>
    	<locking isolation="REPEATABLE_READ" 
    	         acquire-timeout="30000" 
    	         concurrency-level="1000" />
    
  4. Set Lock Striping

    The striping parameter specifies whether lock striping will be used for the local cache.
    <distributed-cache>
    	<locking isolation="REPEATABLE_READ" 
    	         acquire-timeout="30000" 
    	         concurrency-level="1000" 
    	         striping="false" />
    	         ...
    </distributed-cache>
    
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