Es node suddenly OOM with "fatal error on the network layer"

hi,
ES version: 5.4.3
java version: 1.8.0_162

ES was running normally and GC is normal too. But one node suddenly OOM with "fatal error on the network layer"

logs link:

Does anyone meet this before? How to debug this problem ?

Thank you in advance!

By default Elasticsearch will write a heap dump when it encounters an OutOfMemoryError. The best thing to do is to open this heap dump (e.g. in MAT) and investigate what was using all the heap.

thanks, I will try

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