Dynamic changing of log level throws warnings.

[dforste]

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For all general issues, please provide the following details for fast resolution:

• Version: logstash-input-beats in both 6.0.5 and 6.0.8 In logstash 7.5.2
• Operating System: Docker deployment
• Config File (if you have sensitive info, please remove it):

input {
  beats {
    port => 5044
  }
}

• Sample Data:
  Not relevant
• Steps to Reproduce:

docker run -d --name logstash docker.elastic.co/logstash/logstash:7.5.2 
docker exec -it logstash curl -XPUT localhost:9600/_node/logging?pretty -H 'Content-Type: application/json' -d'
{
    "logger.logstash.inputs.beats" : "DEBUG"
}
'

The following logs are emitted when you execute that.

/usr/share/logstash/logstash-core/lib/logstash/api/modules/logging.rb:14: warning: wrong element type NilClass at 0 (expected array)
/usr/share/logstash/logstash-core/lib/logstash/api/modules/logging.rb:14: warning: ignoring wrong elements is deprecated, remove them explicitly
/usr/share/logstash/logstash-core/lib/logstash/api/modules/logging.rb:14: warning: this causes ArgumentError in the next release

No additional logs are emitted after changing the value. The value does seem to change in the api though.

[asolimando]

Same exact error after trying to change the logging level via the LoggingAPI:

curl -XPUT '$myhostport/_node/logging?pretty' -H 'Content-Type: application/json' -d'
{
    "logger.logstash.inputs.kafka" : "DEBUG"
}
'
{
  "host" : "$myhost",
  "version" : "7.1.1",
  "http_address" : "0.0.0.0:9600",
  "id" : "a168aa05-0e1b-490f-afc5-eaadebeb8500",
  "name" : "$myname",
  "acknowledged" : true
}%

In the logs I have:

2020-12-23T08:07:57.953882997Z /usr/share/logstash/logstash-core/lib/logstash/api/modules/logging.rb:14: warning: wrong element type NilClass at 0 (expected array)
2020-12-23T08:07:57.954203734Z /usr/share/logstash/logstash-core/lib/logstash/api/modules/logging.rb:14: warning: ignoring wrong elements is deprecated, remove them explicitly
2020-12-23T08:07:57.954528334Z /usr/share/logstash/logstash-core/lib/logstash/api/modules/logging.rb:14: warning: this causes ArgumentError in the next release
2020-12-23T08:11:29.590014904Z /usr/share/logstash/logstash-core/lib/logstash/api/modules/logging.rb:14: warning: wrong element type NilClass at 0 (expected array)
2020-12-23T08:11:29.590241219Z /usr/share/logstash/logstash-core/lib/logstash/api/modules/logging.rb:14: warning: ignoring wrong elements is deprecated, remove them explicitly
2020-12-23T08:11:29.590331895Z /usr/share/logstash/logstash-core/lib/logstash/api/modules/logging.rb:14: warning: this causes ArgumentError in the next release

However, all seems good displaying the the logging levels (DEBUG is correctly set for Kafka input plugin):

{
  "host" : "$myhost",
  "version" : "7.1.1",
  "http_address" : "0.0.0.0:9600",
  "id" : "a168aa05-0e1b-490f-afc5-eaadebeb8500",
  "name" : "$myname",
  "loggers" : {
    "logstash.agent" : "INFO",
    "logstash.api.service" : "INFO",
    "logstash.codecs.json" : "INFO",
    "logstash.config.source.local.configpathloader" : "INFO",
    "logstash.config.source.multilocal" : "INFO",
    "logstash.config.sourceloader" : "INFO",
    "logstash.filters.csv" : "INFO",
    "logstash.filters.date" : "INFO",
    "logstash.filters.drop" : "INFO",
    "logstash.filters.mutate" : "INFO",
    "logstash.filters.ruby" : "INFO",
    "logstash.inputs.kafka" : "DEBUG",
    "logstash.instrument.periodicpoller.deadletterqueue" : "INFO",
    "logstash.instrument.periodicpoller.jvm" : "INFO",
    "logstash.instrument.periodicpoller.os" : "INFO",
    "logstash.instrument.periodicpoller.persistentqueue" : "INFO",
    "logstash.javapipeline" : "INFO",
    "logstash.modules.scaffold" : "INFO",
    "logstash.outputs.kafka" : "INFO",
    "logstash.plugins.registry" : "INFO",
    "logstash.runner" : "INFO",
    "logstash.setting.writabledirectory" : "INFO",
    "org.apache.kafka.clients.ClientUtils" : "INFO",
    "org.apache.kafka.clients.CommonClientConfigs" : "INFO",
    "org.apache.kafka.clients.Metadata" : "INFO",
    "org.apache.kafka.clients.NetworkClient" : "INFO",
    "org.apache.kafka.clients.consumer.ConsumerConfig" : "INFO",
    "org.apache.kafka.clients.consumer.KafkaConsumer" : "INFO",
    "org.apache.kafka.clients.consumer.internals.AbstractCoordinator" : "INFO",
    "org.apache.kafka.clients.consumer.internals.AbstractPartitionAssignor" : "INFO",
    "org.apache.kafka.clients.consumer.internals.ConsumerCoordinator" : "INFO",
    "org.apache.kafka.clients.consumer.internals.ConsumerInterceptors" : "INFO",
    "org.apache.kafka.clients.consumer.internals.ConsumerNetworkClient" : "INFO",
    "org.apache.kafka.clients.consumer.internals.Fetcher" : "INFO",
    "org.apache.kafka.clients.producer.KafkaProducer" : "INFO",
    "org.apache.kafka.clients.producer.ProducerConfig" : "INFO",
    "org.apache.kafka.clients.producer.internals.ProducerInterceptors" : "INFO",
    "org.apache.kafka.clients.producer.internals.RecordAccumulator" : "INFO",
    "org.apache.kafka.clients.producer.internals.Sender" : "INFO",
    "org.apache.kafka.common.metrics.JmxReporter" : "INFO",
    "org.apache.kafka.common.metrics.Metrics" : "INFO",
    "org.apache.kafka.common.network.NetworkReceive" : "INFO",
    "org.apache.kafka.common.network.PlaintextChannelBuilder" : "INFO",
    "org.apache.kafka.common.network.Selector" : "INFO",
    "org.apache.kafka.common.protocol.Errors" : "INFO",
    "org.apache.kafka.common.requests.DeleteAclsResponse" : "INFO",
    "org.apache.kafka.common.utils.AppInfoParser" : "INFO",
    "org.apache.kafka.common.utils.KafkaThread" : "INFO",
    "org.apache.kafka.common.utils.Utils" : "INFO",
    "org.logstash.Logstash" : "INFO",
    "org.logstash.config.ir.CompiledPipeline" : "INFO",
    "org.logstash.execution.AbstractPipelineExt" : "INFO",
    "org.logstash.execution.JavaBasePipelineExt" : "INFO",
    "org.logstash.execution.PeriodicFlush" : "INFO",
    "org.logstash.execution.ShutdownWatcherExt" : "INFO",
    "org.logstash.execution.WorkerLoop" : "INFO",
    "org.logstash.filters.DateFilter" : "INFO",
    "org.logstash.instrument.metrics.gauge.LazyDelegatingGauge" : "INFO",
    "org.logstash.plugins.pipeline.PipelineBus" : "INFO",
    "org.logstash.secret.store.SecretStoreFactory" : "INFO",
    "slowlog.logstash.codecs.json" : "INFO",
    "slowlog.logstash.filters.csv" : "INFO",
    "slowlog.logstash.filters.date" : "INFO",
    "slowlog.logstash.filters.drop" : "INFO",
    "slowlog.logstash.filters.mutate" : "INFO",
    "slowlog.logstash.filters.ruby" : "INFO",
    "slowlog.logstash.inputs.kafka" : "INFO",
    "slowlog.logstash.outputs.kafka" : "INFO"
  }
}%

It does not recover even with a reset of the log properties via:

curl -XPUT '$myhostport/_node/logging/reset?pretty'