Shared hash table: A hash table is one an important data structure in a wide range of problems. It is particularly important in parallel algorithms as a wide range of distributed data structures can be mapped onto a hash table. As with the distributed array pattern, the problem is the indexing required to transform a global hash key into a local hash key for a particular member of the set of processes or threads involved with a parallel computation. The solution is to place the indexing operations inside a method associated with a hash table data type to insulate this complexity for the larger source code and support reuse between related program.