What is Distributed Lock Service (or Server)? When it needs to be used?
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You don't even necessarily need a special-purpose distribute lock server; in many cases a relational database can provide this functionality. For example, [This post](http://www.codeducky.org/distributed-locking-with-net-and-sqlserver/) describes how to use SQLServer for distributed locking. – ChaseMedallion Mar 17 '16 at 11:02
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Often called a Distributed Lock Manager, it's a way for distributed applications to control access to shared resources. A typical example would be a cluster of computers that present what seems to be a single unified file system, even though behind the scenes they are sharing a collection of file systems. Machines in the cluster would need a (distributed) lock in order to make changes to a file, to prevent race conditions.
Chris Welsh
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1Are any significant open source distributed lock manager that worth looking? – asyncwait Nov 14 '09 at 10:45