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How does MapR FS control concurrent access to a file?

Question asked by mdzfirst on May 6, 2015
Latest reply on May 10, 2015 by Ted Dunning
To be specific, the question can be broke down to three questions:

 1. Does MapR FS support concurrent writers? (Multiple clients write to the same file at the same time.)

 2. Does MapR FS support concurrent writer/readers? (Multiple clients read a file while it is being written by another one.)

 3. How does MapR FS guarantee data consistency under the above circumstances? What granularity are file locks using?

 Thx~


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