15.3. Configure Lock Striping (Library Mode)

Procedure 15.1. Configure Lock Striping (Library Mode)

1. Set the Concurrency Level

   The concurrencyLevel is used to specify the size of the shared lock collection use when lock striping is enabled.

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

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2. Set Isolation Level

   The isolationLevel parameter specifies the cache's isolation level. Valid isolation levels are READ_COMMITTED and REPEATABLE_READ.

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

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3. Specify 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}"/>

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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. If set to TRUE, lock striping is enabled and shared locks are used as required from the pool.

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

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5. Configure Write Skew Check

   The writeSkewCheck check determines if a modification to the entry from a different transaction should roll back the transaction. Write skew set to true requires isolation_level set to REPEATABLE_READ. The default value for writeSkewCheck and isolation_level are FALSE and READ_COMMITTED respectively.

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

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