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ConcurrentHashMap - segmentation ?

 
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ConcurrentHashMap supports segmentation , how large it becomes only certain part of it get locked to provide thread safety so other threads can still access map without waiting for iteration to complete.(ConcurrentHashMap only locked certain portion of Map)



How ConcurrentHashMap only locked certain portion of Map ?
 
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You can check the source code by unpacking the src.zip file located in your JDK folder, then opening file java\util\concurrent\ConcurrentHashMap.java.
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