ywcb00 opened a new pull request #1521:
URL: https://github.com/apache/systemds/pull/1521


   Hi,
   this PR introduces the _FederatedReadCache_ for the federated worker. The 
_FederatedReadCache_ is basically a map that maps from filename to a data 
object. In order to allow and optimize for concurrent READ_VAR requests on the 
federated site, the data object is wrapped inside a placeholder 
(_ReadCacheEntry_) so that only one thread reads the object from fs while the 
other threads wait for the data to be placed inside the placeholder.
   In addition, this PR enables multithreaded processing of requests at the 
federated worker with a maximal threadpool size of 4 times the number of cpu 
processors.
   
   Thanks for review :)


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