Log full of "encountered retryable error" and logstash stopped listening

[Jose_Ramierez (Jose)]

The active investigation on this issue is being discussed here:

IOException: Too many open files - TCP input

We're getting the following exception when using Logstash tcp input. Elastic stack running 5.6.4 on Centos 7.4 [2017-11-10T23:59:58,325][WARN ][io.netty.channel.DefaultChannelPipeline] An exceptionCaught() event was fired, and it reached at the tail of the pipeline. It usually means the last handler in the pipeline did not handle the exception. java.io.IOException: Too many open files at sun.nio.ch.ServerSocketChannelImpl.accept0(Native Method) ~[?:1.8.0_151] at sun.nio.ch.ServerSocketChann…