ES version: 5.4.3
java version: 1.8.0_162
ES cluster: 3 dedicated master, 7 hot datanode, 14 cold datanode, 31GB heap for each node
9,425 indices and 23000 shards
ES cluster was running normally. But one node suddenly output lots of disconnected logs and then OOM. Before OOM， the CPU is exhausted. I am sure there is no problem with network.
Does anyone meet this before?