What are the advantages and the disadvantages of running multiple instances of logstash in the same cluster?
Logstash can be quite memory intensive and managing the number of workers is easier with a single instance.
You're better off running multiple pipelines in a single logstash instance. However, if you want to run a containerized/kubernetes version of logstash then you have the advantage of load balancing and high uptime availability.
What do you mean for workers? The nodes of logstash?
No a worker is a thread inside of logstash that can be defined for each pipeline.
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