Logstash 8.4.2 Extremely High CPU Loading

Elastic Stack Logstash
1

My Logstash loading has been about avg. ~10% loading for couple months. Without any change on grokking and configuration, even event/s is about the same rate, just upgrading my Logstash to v8.4.2 causing CPU loading jumped to 90% up constantly.

I have tried to adjust the JVM heap size to be about 65% of the available memory on the server, but it doesn't help. Checked CPU usage per thread with top -h, those input threads are what's causing such high usage instead of those GC threads.

Anyone is experience the same thing?

2

Upgraded from which version?

Do you have anything in Logstash logs?

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From 8.2.2 to 8.4.2.

I don't see any warning nor anything abnormal in Logstash logs. Restarted multiple times.

4

Found couple warnings saying:
Received an event that has a different character encoding than you configured. .......... :expected_charset=>"UTF-8""

Not sure if the above is related.

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5

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