10.3.4. Explicit Pessimistic Locking Example

Procedure 10.3. Transaction with Explicit Pessimistic Locking

1. When the line cache.lock(K) executes, a cluster-wide lock is acquired on K.

   tx.begin()
   cache.lock(K)
   

2. When the line cache.put(K,V5) executes, it guarantees success.

   tx.begin()
   cache.lock(K)           
   cache.put(K,V5)
   

3. When the line tx.commit() executes, the locks held for this process are released.

   tx.begin()
   cache.lock(K)           
   cache.put(K,V5)         
   tx.commit()