Logstash cpu utilization is 100%


I am using 5.1.3 logstash. My configuration contains tcp as input with multiline codec , followed by filter and output to file.
I have 4core CPU with 16G RAM on my redhat machine. openjsk1.8 i am using.

I tried to increase the heap size to 14g max and 4g min. But still no use.

I read that increasing workers will not help with multiline.

Can somebody help me how to debug the issue.

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