10.2. Configure Locking (Library Mode)

Procedure 10.2. Configure Locking (Library Mode)

1. Set the Concurrency Level

   The concurrencyLevel parameter specifies the concurrency level for the lock container. Set this value according to the number of concurrent threads interacting with the data grid.

   <infinispan>
   	...
   	<default>
   		<locking concurrencyLevel="${VALUE}" />
   

2. Specify the Cache Isolation Level

   The isolationLevel parameter specifies the cache's isolation level. Valid isolation levels are READ_COMMITTED and REPEATABLE_READ. For details about isolation levels, see Section 12.1, “About Isolation Levels”

   <infinispan>
   	...
   	<default>
   		<locking concurrencyLevel="${VALUE}"
   				isolationLevel="${LEVEL}" />
   

3. Set the Lock Acquisition Timeout

   The lockAcquisitionTimeout parameter specifies time (in milliseconds) after which a lock acquisition attempt times out.

   <infinispan>
   	...
   	<default>
   		<locking concurrencyLevel="${VALUE}"
   			isolationLevel="${LEVEL}"
   			lockAcquisitionTimeout="${TIME}" />
   

4. Configure Lock Striping

   The useLockStriping parameter specifies whether a pool of shared locks are maintained for all entries that require locks. If set to FALSE, locks are created for each entry in the cache. For details, see Section 11.1, “About Lock Striping”

   <infinispan>
   	...
   	<default>
   		<locking concurrencyLevel="${VALUE}"
   			isolationLevel="${LEVEL}"
   			lockAcquisitionTimeout="${TIME}"
   			useLockStriping="${TRUE/FALSE}" />
   

   • Set writeSkewCheck Parameter

     The writeSkewCheck parameter is only valid if the isolationLevel is set to REPEATABLE_READ. If this parameter is set to FALSE, a disparity between a working entry and the underlying entry at write time results in the working entry overwriting the underlying entry. If the parameter is set to TRUE, such conflicts (namely write skews) throw an exception.

     <infinispan>
     	...
     	<default>
     		<locking concurrencyLevel="${VALUE}"
     			isolationLevel="${LEVEL}"
     			lockAcquisitionTimeout="${TIME}"
     			useLockStriping="${TRUE/FALSE}"
     			writeSkewCheck="${TRUE/FALSE}" />