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Hit cache is synchronised, making concurrent lookups impossible #35
Logstash version 5.5.1
Enabling the cache reduces dns performance, while a hacked version with no synchronisation has better performance.
By looking at the blog post, it make sense that you have better performance without the lock.
We will have to profile that.
If the LRU is blocking the whole structure for a check or an update, this is not optimal.