show picture the sum of all node is 399MB, but the every node is small, how to understand ??? （This is a java application memory hprof snapshot, a screenshot of using eclipse mat for memory analysis）
How to understand this eclipse MAT data?
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The image shows that the ConcurrentHashMap$Node[] array @0x7a411fdb0 retains 399MB of objects, but the path to those objects goes through two or more of the ConcurrentHashMap$Node objects, so none of the ConcurrentHashMap$Node objects is individually responsible for the retaining the 399MB of objects.
See https://help.eclipse.org/latest/topic/org.eclipse.mat.ui.help/concepts/shallowretainedheap.html?cp=55_2_2
Try on ConcurrentHashMap$Node[] @0x7a411fdb0
to see more.
Also, try running the Leak Suspects report.