gistfile1.txt

# env var:
# keystore:
# pipeline.workers = default to cpu cores
❯ docker run docker.elastic.co/logstash/logstash-full:8.16.0-SNAPSHOT sh -c 'rm config/logstash.keystore && echo 1 | bin/logstash -e "" | grep pipeline.workers'                  
[2024-08-09T16:06:29,979][INFO ][logstash.javapipeline][main] Starting pipeline {:pipeline_id=>"main", "pipeline.workers"=>10, [...]

# env var: 2
# keystore:
# pipeline.workers = env var 
❯ docker run -e PIPELINE_WORKERS="2" docker.elastic.co/logstash/logstash-full:8.16.0-SNAPSHOT sh -c 'rm config/logstash.keystore && echo 1 | bin/logstash -e "" | grep pipeline.workers'
found pipeline.workers in env: 2
[2024-08-09T16:06:44,596][INFO ][logstash.javapipeline][main] Starting pipeline {:pipeline_id=>"main", "pipeline.workers"=>2, [...]

# env var:
# keystore: 4
# pipeline.workers = keystore
❯ docker run docker.elastic.co/logstash/logstash-full:8.16.0-SNAPSHOT sh -c 'echo 1 | bin/logstash -e "" | grep pipeline.workers'                         
found pipeline.workers in keystore: 4
[2024-08-09T16:07:05,658][INFO ][logstash.javapipeline][main] Starting pipeline {:pipeline_id=>"main", "pipeline.workers"=>4, [...]

# env var: 2
# keystore: 4
# pipeline.workers = keystore
❯ docker run -e PIPELINE_WORKERS="2" docker.elastic.co/logstash/logstash-full:8.16.0-SNAPSHOT sh -c 'echo 1 | bin/logstash -e "" | grep pipeline.workers'                         
found pipeline.workers in env: 2
found pipeline.workers in keystore: 4
[2024-08-09T16:07:21,354][INFO ][logstash.javapipeline][main] Starting pipeline {:pipeline_id=>"main", "pipeline.workers"=>4, [...]

# env var: 2
# keystore: 4
# cli arg: 12
# pipeline.workers = cli arg
❯ docker run -e PIPELINE_WORKERS="2" docker.elastic.co/logstash/logstash-full:8.16.0-SNAPSHOT sh -c 'echo 1 | bin/logstash -e "" -w 12 | grep pipeline.workers'
found pipeline.workers in env: 2
found pipeline.workers in keystore: 4
[2024-08-09T16:07:41,943][INFO ][logstash.javapipeline][main] Starting pipeline {:pipeline_id=>"main", "pipeline.workers"=>12, [...]