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26c4f1fb6c
Changes the default of the `node.name` setting to the hostname of the machine on which Elasticsearch is running. Previously it was the first 8 characters of the node id. This had the advantage of producing a unique name even when the node name isn't configured but the disadvantage of being unrecognizable and not being available until fairly late in the startup process. Of particular interest is that it isn't available until after logging is configured. This forces us to use a volatile read whenever we add the node name to the log. Using the hostname is available immediately on startup and is generally recognizable but has the disadvantage of not being unique when run on machines that don't set their hostname or when multiple elasticsearch processes are run on the same host. I believe that, taken together, it is better to default to the hostname. 1. Running multiple copies of Elasticsearch on the same node is a fairly advanced feature. We do it all the as part of the elasticsearch build for testing but we make sure to set the node name then. 2. That the node.name defaults to some flavor of "localhost" on an unconfigured box feels like it isn't going to come up too much in production. I expect most production deployments to at least set the hostname. As a bonus, production deployments need no longer set the node name in most cases. At least in my experience most folks set it to the hostname anyway.
197 lines
8.4 KiB
Plaintext
197 lines
8.4 KiB
Plaintext
[[logging]]
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=== Logging configuration
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Elasticsearch uses https://logging.apache.org/log4j/2.x/[Log4j 2] for
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logging. Log4j 2 can be configured using the log4j2.properties
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file. Elasticsearch exposes three properties, `${sys:es.logs.base_path}`,
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`${sys:es.logs.cluster_name}`, and `${sys:es.logs.node_name}` that can be
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referenced in the configuration file to determine the location of the log
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files. The property `${sys:es.logs.base_path}` will resolve to the log directory,
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`${sys:es.logs.cluster_name}` will resolve to the cluster name (used as the
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prefix of log filenames in the default configuration), and
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`${sys:es.logs.node_name}` will resolve to the node name (if the node name is
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explicitly set).
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For example, if your log directory (`path.logs`) is `/var/log/elasticsearch` and
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your cluster is named `production` then `${sys:es.logs.base_path}` will resolve
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to `/var/log/elasticsearch` and
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`${sys:es.logs.base_path}${sys:file.separator}${sys:es.logs.cluster_name}.log`
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will resolve to `/var/log/elasticsearch/production.log`.
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[source,properties]
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--------------------------------------------------
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appender.rolling.type = RollingFile <1>
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appender.rolling.name = rolling
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appender.rolling.fileName = ${sys:es.logs.base_path}${sys:file.separator}${sys:es.logs.cluster_name}.log <2>
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appender.rolling.layout.type = PatternLayout
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appender.rolling.layout.pattern = [%d{ISO8601}][%-5p][%-25c{1.}] [%node_name]%marker %.-10000m%n
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appender.rolling.filePattern = ${sys:es.logs.base_path}${sys:file.separator}${sys:es.logs.cluster_name}-%d{yyyy-MM-dd}-%i.log.gz <3>
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appender.rolling.policies.type = Policies
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appender.rolling.policies.time.type = TimeBasedTriggeringPolicy <4>
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appender.rolling.policies.time.interval = 1 <5>
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appender.rolling.policies.time.modulate = true <6>
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appender.rolling.policies.size.type = SizeBasedTriggeringPolicy <7>
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appender.rolling.policies.size.size = 256MB <8>
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appender.rolling.strategy.type = DefaultRolloverStrategy
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appender.rolling.strategy.fileIndex = nomax
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appender.rolling.strategy.action.type = Delete <9>
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appender.rolling.strategy.action.basepath = ${sys:es.logs.base_path}
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appender.rolling.strategy.action.condition.type = IfFileName <10>
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appender.rolling.strategy.action.condition.glob = ${sys:es.logs.cluster_name}-* <11>
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appender.rolling.strategy.action.condition.nested_condition.type = IfAccumulatedFileSize <12>
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appender.rolling.strategy.action.condition.nested_condition.exceeds = 2GB <13>
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--------------------------------------------------
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<1> Configure the `RollingFile` appender
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<2> Log to `/var/log/elasticsearch/production.log`
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<3> Roll logs to `/var/log/elasticsearch/production-yyyy-MM-dd-i.log`; logs
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will be compressed on each roll and `i` will be incremented
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<4> Use a time-based roll policy
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<5> Roll logs on a daily basis
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<6> Align rolls on the day boundary (as opposed to rolling every twenty-four
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hours)
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<7> Using a size-based roll policy
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<8> Roll logs after 256 MB
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<9> Use a delete action when rolling logs
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<10> Only delete logs matching a file pattern
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<11> The pattern is to only delete the main logs
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<12> Only delete if we have accumulated too many compressed logs
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<13> The size condition on the compressed logs is 2 GB
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NOTE: Log4j's configuration parsing gets confused by any extraneous whitespace;
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if you copy and paste any Log4j settings on this page, or enter any Log4j
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configuration in general, be sure to trim any leading and trailing whitespace.
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Note than you can replace `.gz` by `.zip` in `appender.rolling.filePattern` to
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compress the rolled logs using the zip format. If you remove the `.gz`
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extension then logs will not be compressed as they are rolled.
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If you want to retain log files for a specified period of time, you can use a
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rollover strategy with a delete action.
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[source,properties]
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--------------------------------------------------
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appender.rolling.strategy.type = DefaultRolloverStrategy <1>
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appender.rolling.strategy.action.type = Delete <2>
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appender.rolling.strategy.action.basepath = ${sys:es.logs.base_path} <3>
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appender.rolling.strategy.action.condition.type = IfFileName <4>
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appender.rolling.strategy.action.condition.glob = ${sys:es.logs.cluster_name}-* <5>
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appender.rolling.strategy.action.condition.nested_condition.type = IfLastModified <6>
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appender.rolling.strategy.action.condition.nested_condition.age = 7D <7>
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--------------------------------------------------
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<1> Configure the `DefaultRolloverStrategy`
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<2> Configure the `Delete` action for handling rollovers
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<3> The base path to the Elasticsearch logs
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<4> The condition to apply when handling rollovers
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<5> Delete files from the base path matching the glob
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`${sys:es.logs.cluster_name}-*`; this is the glob that log files are rolled
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to; this is needed to only delete the rolled Elasticsearch logs but not also
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delete the deprecation and slow logs
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<6> A nested condition to apply to files matching the glob
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<7> Retain logs for seven days
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Multiple configuration files can be loaded (in which case they will get merged)
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as long as they are named `log4j2.properties` and have the Elasticsearch config
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directory as an ancestor; this is useful for plugins that expose additional
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loggers. The logger section contains the java packages and their corresponding
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log level. The appender section contains the destinations for the logs.
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Extensive information on how to customize logging and all the supported
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appenders can be found on the
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http://logging.apache.org/log4j/2.x/manual/configuration.html[Log4j
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documentation].
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[float]
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[[configuring-logging-levels]]
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=== Configuring logging levels
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There are four ways to configuring logging levels, each having situations in which they are appropriate to use.
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1. Via the command-line: `-E <name of logging hierarchy>=<level>` (e.g.,
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`-E logger.org.elasticsearch.transport=trace`). This is most appropriate when
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you are temporarily debugging a problem on a single node (for example, a
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problem with startup, or during development).
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2. Via `elasticsearch.yml`: `<name of logging hierarchy>: <level>` (e.g.,
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`logger.org.elasticsearch.transport: trace`). This is most appropriate when
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you are temporarily debugging a problem but are not starting Elasticsearch
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via the command-line (e.g., via a service) or you want a logging level
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adjusted on a more permanent basis.
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3. Via <<cluster-logger,cluster settings>>:
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+
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--
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[source,js]
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-------------------------------
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PUT /_cluster/settings
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{
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"transient": {
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"<name of logging hierarchy>": "<level>"
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}
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}
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-------------------------------
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// NOTCONSOLE
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For example:
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[source,js]
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-------------------------------
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PUT /_cluster/settings
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{
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"transient": {
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"logger.org.elasticsearch.transport": "trace"
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}
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}
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-------------------------------
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// CONSOLE
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This is most appropriate when you need to dynamically need to adjust a logging
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level on an actively-running cluster.
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--
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4. Via the `log4j2.properties`:
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+
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--
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[source,properties]
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--------------------------------------------------
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logger.<unique_identifier>.name = <name of logging hierarchy>
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logger.<unique_identifier>.level = <level>
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--------------------------------------------------
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For example:
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[source,properties]
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--------------------------------------------------
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logger.transport.name = org.elasticsearch.transport
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logger.transport.level = trace
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--------------------------------------------------
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This is most appropriate when you need fine-grained control over the logger (for
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example, you want to send the logger to another file, or manage the logger
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differently; this is a rare use-case).
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--
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[float]
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[[deprecation-logging]]
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=== Deprecation logging
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In addition to regular logging, Elasticsearch allows you to enable logging
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of deprecated actions. For example this allows you to determine early, if
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you need to migrate certain functionality in the future. By default,
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deprecation logging is enabled at the WARN level, the level at which all
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deprecation log messages will be emitted.
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[source,properties]
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--------------------------------------------------
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logger.deprecation.level = warn
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--------------------------------------------------
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This will create a daily rolling deprecation log file in your log directory.
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Check this file regularly, especially when you intend to upgrade to a new
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major version.
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The default logging configuration has set the roll policy for the deprecation
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logs to roll and compress after 1 GB, and to preserve a maximum of five log
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files (four rolled logs, and the active log).
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You can disable it in the `config/log4j2.properties` file by setting the deprecation
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log level to `error`.
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