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class="navGroups"><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Getting started<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z"></path><path d="M0 0h24v24H0z" fill="none"></path></svg></span></h3><ul class="hide"><li class="navListItem"><a class="navItem" href="/docs/26.0.0/design/index.html">Introduction to Apache Druid</a></li><li class="navListItem"><a class="navItem" href="/docs/26.0.0/tutorials/index.html">Quickstart (local)</a></li><li class="navListItem"><a class="navItem" href="/docs/26.0.0/operations/single-server.html">Single server deployment</a></li><li class="navListItem"><a class="navItem" href="/docs/26.0.0/tutorials/cluster.html">Clustered deployment</a></li></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Tutorials<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 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storage</a></li><li class="navListItem"><a class="navItem" href="/docs/26.0.0/tutorials/tutorial-msq-convert-spec.html">Convert ingestion spec to SQL</a></li><li class="navListItem"><a class="navItem" href="/docs/26.0.0/tutorials/tutorial-sql-query-view.html">Get to know Query view</a></li><li class="navListItem"><a class="navItem" href="/docs/26.0.0/tutorials/tutorial-unnest-arrays.html">Unnesting arrays</a></li><li class="navListItem"><a class="navItem" href="/docs/26.0.0/tutorials/tutorial-jupyter-index.html">Jupyter Notebook tutorials</a></li><li class="navListItem"><a class="navItem" href="/docs/26.0.0/tutorials/tutorial-jupyter-docker.html">Docker for tutorials</a></li><li class="navListItem"><a class="navItem" href="/docs/26.0.0/tutorials/tutorial-jdbc.html">JDBC connector</a></li></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Design<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 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14l-6-6-6 6z"></path><path d="M0 0h24v24H0z" fill="none"></path></svg></span></h3><ul class="hide"><li class="navListItem"><a class="navItem" href="/docs/26.0.0/ingestion/index.html">Ingestion</a></li><li class="navListItem"><a class="navItem" href="/docs/26.0.0/ingestion/data-formats.html">Data formats</a></li><li class="navListItem"><a class="navItem" href="/docs/26.0.0/ingestion/data-model.html">Data model</a></li><li class="navListItem"><a class="navItem" href="/docs/26.0.0/ingestion/rollup.html">Data rollup</a></li><li class="navListItem"><a class="navItem" href="/docs/26.0.0/ingestion/partitioning.html">Partitioning</a></li><li class="navListItem"><a class="navItem" href="/docs/26.0.0/ingestion/ingestion-spec.html">Ingestion spec</a></li><li class="navListItem"><a class="navItem" href="/docs/26.0.0/ingestion/schema-design.html">Schema design tips</a></li><div class="navGroup subNavGroup"><h4 class="navGroupSubcategoryTitle">Stream ingestion</h4><ul><li class="navListItem"><a class="navItem" href="/docs/26.0.0/development/extensions-core/kafka-ingestion.html">Apache Kafka ingestion</a></li><li class="navListItem"><a class="navItem" href="/docs/26.0.0/development/extensions-core/kafka-supervisor-reference.html">Apache Kafka supervisor</a></li><li class="navListItem"><a class="navItem" href="/docs/26.0.0/development/extensions-core/kafka-supervisor-operations.html">Apache Kafka operations</a></li><li class="navListItem"><a class="navItem" href="/docs/26.0.0/development/extensions-core/kinesis-ingestion.html">Amazon Kinesis</a></li></ul></div><div class="navGroup subNavGroup"><h4 class="navGroupSubcategoryTitle">Batch ingestion</h4><ul><li class="navListItem"><a class="navItem" href="/docs/26.0.0/ingestion/native-batch.html">Native batch</a></li><li class="navListItem"><a class="navItem" href="/docs/26.0.0/ingestion/native-batch-input-sources.html">Native batch: input sources</a></li><li class="navListItem"><a class="navItem" href="/docs/26.0.0/ingestion/migrate-from-firehose.html">Migrate from firehose</a></li><li class="navListItem"><a class="navItem" href="/docs/26.0.0/ingestion/hadoop.html">Hadoop-based</a></li></ul></div><div class="navGroup subNavGroup"><h4 class="navGroupSubcategoryTitle">SQL-based ingestion 🆕</h4><ul><li class="navListItem"><a class="navItem" href="/docs/26.0.0/multi-stage-query/index.html">Overview</a></li><li class="navListItem"><a class="navItem" href="/docs/26.0.0/multi-stage-query/concepts.html">Key concepts</a></li><li class="navListItem"><a class="navItem" href="/docs/26.0.0/multi-stage-query/api.html">API</a></li><li class="navListItem"><a class="navItem" href="/docs/26.0.0/multi-stage-query/security.html">Security</a></li><li class="navListItem"><a class="navItem" href="/docs/26.0.0/multi-stage-query/examples.html">Examples</a></li><li class="navListItem"><a class="navItem" href="/docs/26.0.0/multi-stage-query/reference.html">Reference</a></li><li class="navListItem"><a class="navItem" href="/docs/26.0.0/multi-stage-query/known-issues.html">Known issues</a></li></ul></div><li class="navListItem"><a class="navItem" href="/docs/26.0.0/ingestion/tasks.html">Task reference</a></li><li class="navListItem"><a class="navItem" href="/docs/26.0.0/ingestion/faq.html">Troubleshooting FAQ</a></li></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Data management<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z"></path><path d="M0 0h24v24H0z" fill="none"></path></svg></span></h3><ul class="hide"><li class="navListItem"><a class="navItem" href="/docs/26.0.0/data-management/index.html">Overview</a></li><li class="navListItem"><a class="navItem" href="/docs/26.0.0/data-management/update.html">Data updates</a></li><li class="navListItem"><a class="navItem" href="/docs/26.0.0/data-management/delete.html">Data deletion</a></li><li class="navListItem"><a class="navItem" href="/docs/26.0.0/data-management/schema-changes.html">Schema changes</a></li><li class="navListItem"><a class="navItem" href="/docs/26.0.0/data-management/compaction.html">Compaction</a></li><li class="navListItem"><a class="navItem" href="/docs/26.0.0/data-management/automatic-compaction.html">Automatic compaction</a></li></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Querying<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z"></path><path d="M0 0h24v24H0z" fill="none"></path></svg></span></h3><ul class="hide"><div class="navGroup subNavGroup"><h4 class="navGroupSubcategoryTitle">Druid SQL</h4><ul><li class="navListItem"><a class="navItem" href="/docs/26.0.0/querying/sql.html">Overview and syntax</a></li><li class="navListItem"><a class="navItem" href="/docs/26.0.0/querying/sql-data-types.html">SQL data types</a></li><li class="navListItem"><a class="navItem" href="/docs/26.0.0/querying/sql-operators.html">Operators</a></li><li class="navListItem"><a class="navItem" href="/docs/26.0.0/querying/sql-scalar.html">Scalar functions</a></li><li class="navListItem"><a class="navItem" href="/docs/26.0.0/querying/sql-aggregations.html">Aggregation functions</a></li><li class="navListItem"><a class="navItem" href="/docs/26.0.0/querying/sql-multivalue-string-functions.html">Multi-value string functions</a></li><li class="navListItem"><a class="navItem" href="/docs/26.0.0/querying/sql-json-functions.html">JSON functions</a></li><li class="navListItem"><a class="navItem" href="/docs/26.0.0/querying/sql-functions.html">All functions</a></li><li class="navListItem"><a class="navItem" href="/docs/26.0.0/querying/sql-api.html">Druid SQL API</a></li><li class="navListItem"><a class="navItem" href="/docs/26.0.0/querying/sql-jdbc.html">JDBC driver API</a></li><li class="navListItem"><a class="navItem" href="/docs/26.0.0/querying/sql-query-context.html">SQL query context</a></li><li class="navListItem"><a class="navItem" href="/docs/26.0.0/querying/sql-metadata-tables.html">SQL metadata tables</a></li><li class="navListItem"><a class="navItem" href="/docs/26.0.0/querying/sql-translation.html">SQL query translation</a></li></ul></div><li class="navListItem"><a class="navItem" href="/docs/26.0.0/querying/querying.html">Native queries</a></li><li class="navListItem"><a class="navItem" href="/docs/26.0.0/querying/query-execution.html">Query execution</a></li><li class="navListItem"><a class="navItem" href="/docs/26.0.0/querying/troubleshooting.html">Troubleshooting</a></li><div class="navGroup subNavGroup"><h4 class="navGroupSubcategoryTitle">Concepts</h4><ul><li class="navListItem"><a class="navItem" href="/docs/26.0.0/querying/datasource.html">Datasources</a></li><li class="navListItem"><a class="navItem" href="/docs/26.0.0/querying/joins.html">Joins</a></li><li class="navListItem"><a class="navItem" href="/docs/26.0.0/querying/lookups.html">Lookups</a></li><li class="navListItem"><a class="navItem" href="/docs/26.0.0/querying/multi-value-dimensions.html">Multi-value dimensions</a></li><li class="navListItem"><a class="navItem" href="/docs/26.0.0/querying/nested-columns.html">Nested columns</a></li><li class="navListItem"><a class="navItem" href="/docs/26.0.0/querying/multitenancy.html">Multitenancy</a></li><li class="navListItem"><a class="navItem" href="/docs/26.0.0/querying/caching.html">Query caching</a></li><li class="navListItem"><a class="navItem" href="/docs/26.0.0/querying/using-caching.html">Using query caching</a></li><li class="navListItem"><a class="navItem" href="/docs/26.0.0/querying/query-context.html">Query context</a></li></ul></div><div class="navGroup subNavGroup"><h4 class="navGroupSubcategoryTitle">Native query types</h4><ul><li class="navListItem"><a class="navItem" href="/docs/26.0.0/querying/timeseriesquery.html">Timeseries</a></li><li class="navListItem"><a class="navItem" href="/docs/26.0.0/querying/topnquery.html">TopN</a></li><li class="navListItem"><a class="navItem" href="/docs/26.0.0/querying/groupbyquery.html">GroupBy</a></li><li class="navListItem"><a class="navItem" href="/docs/26.0.0/querying/scan-query.html">Scan</a></li><li class="navListItem"><a class="navItem" href="/docs/26.0.0/querying/searchquery.html">Search</a></li><li class="navListItem"><a class="navItem" href="/docs/26.0.0/querying/timeboundaryquery.html">TimeBoundary</a></li><li class="navListItem"><a class="navItem" href="/docs/26.0.0/querying/segmentmetadataquery.html">SegmentMetadata</a></li><li class="navListItem"><a class="navItem" href="/docs/26.0.0/querying/datasourcemetadataquery.html">DatasourceMetadata</a></li></ul></div><div class="navGroup subNavGroup"><h4 class="navGroupSubcategoryTitle">Native query components</h4><ul><li class="navListItem"><a class="navItem" href="/docs/26.0.0/querying/filters.html">Filters</a></li><li class="navListItem"><a class="navItem" href="/docs/26.0.0/querying/granularities.html">Granularities</a></li><li class="navListItem"><a class="navItem" href="/docs/26.0.0/querying/dimensionspecs.html">Dimensions</a></li><li class="navListItem"><a class="navItem" href="/docs/26.0.0/querying/aggregations.html">Aggregations</a></li><li class="navListItem"><a class="navItem" href="/docs/26.0.0/querying/post-aggregations.html">Post-aggregations</a></li><li class="navListItem"><a class="navItem" href="/docs/26.0.0/misc/math-expr.html">Expressions</a></li><li class="navListItem"><a class="navItem" href="/docs/26.0.0/querying/having.html">Having filters (groupBy)</a></li><li class="navListItem"><a class="navItem" href="/docs/26.0.0/querying/limitspec.html">Sorting and limiting (groupBy)</a></li><li class="navListItem"><a class="navItem" href="/docs/26.0.0/querying/topnmetricspec.html">Sorting (topN)</a></li><li class="navListItem"><a class="navItem" href="/docs/26.0.0/querying/sorting-orders.html">String comparators</a></li><li class="navListItem"><a class="navItem" href="/docs/26.0.0/querying/virtual-columns.html">Virtual columns</a></li><li class="navListItem"><a class="navItem" href="/docs/26.0.0/development/geo.html">Spatial filters</a></li></ul></div></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Configuration<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z"></path><path d="M0 0h24v24H0z" fill="none"></path></svg></span></h3><ul class="hide"><li class="navListItem"><a class="navItem" href="/docs/26.0.0/configuration/index.html">Configuration reference</a></li><li class="navListItem"><a class="navItem" href="/docs/26.0.0/development/extensions.html">Extensions</a></li><li class="navListItem navListItemActive"><a class="navItem" href="/docs/26.0.0/configuration/logging.html">Logging</a></li></ul></div><div class="navGroup"><h3 class="navGroupCategoryTitle collapsible">Operations<span class="arrow"><svg width="24" height="24" viewBox="0 0 24 24"><path fill="#565656" d="M7.41 15.41L12 10.83l4.59 4.58L18 14l-6-6-6 6z"></path><path d="M0 0h24v24H0z" fill="none"></path></svg></span></h3><ul class="hide"><li class="navListItem"><a class="navItem" href="/docs/26.0.0/operations/web-console.html">Web console</a></li><li class="navListItem"><a class="navItem" href="/docs/26.0.0/operations/java.html">Java runtime</a></li><div class="navGroup subNavGroup"><h4 class="navGroupSubcategoryTitle">Security</h4><ul><li class="navListItem"><a class="navItem" href="/docs/26.0.0/operations/security-overview.html">Security overview</a></li><li class="navListItem"><a class="navItem" href="/docs/26.0.0/operations/security-user-auth.html">User authentication and authorization</a></li><li class="navListItem"><a class="navItem" href="/docs/26.0.0/operations/auth-ldap.html">LDAP auth</a></li><li class="navListItem"><a class="navItem" href="/docs/26.0.0/operations/password-provider.html">Password providers</a></li><li class="navListItem"><a class="navItem" href="/docs/26.0.0/operations/dynamic-config-provider.html">Dynamic Config Providers</a></li><li class="navListItem"><a class="navItem" href="/docs/26.0.0/operations/tls-support.html">TLS support</a></li></ul></div><div class="navGroup subNavGroup"><h4 class="navGroupSubcategoryTitle">Performance tuning</h4><ul><li class="navListItem"><a class="navItem" href="/docs/26.0.0/operations/basic-cluster-tuning.html">Basic cluster tuning</a></li><li class="navListItem"><a class="navItem" href="/docs/26.0.0/operations/segment-optimization.html">Segment size optimization</a></li><li class="navListItem"><a class="navItem" href="/docs/26.0.0/operations/mixed-workloads.html">Mixed workloads</a></li><li class="navListItem"><a class="navItem" href="/docs/26.0.0/operations/http-compression.html">HTTP compression</a></li><li 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Process</a></li></ul></div></div></section></div><script> |
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| </script></nav></div><div class="container mainContainer docsContainer"><div class="wrapper"><div class="post"><header class="postHeader"><a class="edit-page-link button" href="https://github.com/apache/druid/edit/master/docs/configuration/logging.md" target="_blank" rel="noreferrer noopener">Edit</a><h1 id="__docusaurus" class="postHeaderTitle">Logging</h1></header><article><div><span><!-- |
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| <p>Apache Druid services emit logs that to help you debug. |
| The same services also emit periodic <a href="/docs/26.0.0/configuration/index.html#enabling-metrics">metrics</a> about their state. |
| To disable metric info logs set the following runtime property: <code>-Ddruid.emitter.logging.logLevel=debug</code>.</p> |
| <p>Druid uses <a href="http://logging.apache.org/log4j/2.x/">log4j2</a> for logging. |
| The default configuration file log4j2.xml ships with Druid at the following path: <code>conf/druid/{config}/_common/log4j2.xml</code>.</p> |
| <p>By default, Druid uses <code>RollingRandomAccessFile</code> for rollover daily, and keeps log files up to 7 days. |
| If that's not suitable in your case, modify the <code>log4j2.xml</code> accordingly.</p> |
| <p>The following example log4j2.xml is based upon the micro quickstart:</p> |
| <pre><code class="hljs"><span class="xml"><span class="hljs-meta"><?xml version="1.0" encoding="UTF-8" ?></span> |
| <span class="hljs-tag"><<span class="hljs-name">Configuration</span> <span class="hljs-attr">status</span>=<span class="hljs-string">"WARN"</span>></span> |
| <span class="hljs-tag"><<span class="hljs-name">Properties</span>></span> |
| <span class="hljs-comment"><!-- to change log directory, set DRUID_LOG_DIR environment variable to your directory before launching Druid --></span> |
| <span class="hljs-tag"><<span class="hljs-name">Property</span> <span class="hljs-attr">name</span>=<span class="hljs-string">"druid.log.path"</span> <span class="hljs-attr">value</span>=<span class="hljs-string">"log"</span> /></span> |
| <span class="hljs-tag"></<span class="hljs-name">Properties</span>></span> |
| |
| <span class="hljs-tag"><<span class="hljs-name">Appenders</span>></span> |
| <span class="hljs-tag"><<span class="hljs-name">Console</span> <span class="hljs-attr">name</span>=<span class="hljs-string">"Console"</span> <span class="hljs-attr">target</span>=<span class="hljs-string">"SYSTEM_OUT"</span>></span> |
| <span class="hljs-tag"><<span class="hljs-name">PatternLayout</span> <span class="hljs-attr">pattern</span>=<span class="hljs-string">"%d</span></span></span><span class="hljs-template-variable">{ISO8601}</span><span class="xml"><span class="hljs-tag"><span class="hljs-string"> %p [%t] %c - %m%n"</span>/></span> |
| <span class="hljs-tag"></<span class="hljs-name">Console</span>></span> |
| |
| <span class="hljs-comment"><!-- Rolling Files--></span> |
| <span class="hljs-tag"><<span class="hljs-name">RollingRandomAccessFile</span> <span class="hljs-attr">name</span>=<span class="hljs-string">"FileAppender"</span> |
| <span class="hljs-attr">fileName</span>=<span class="hljs-string">"$</span></span></span><span class="hljs-template-variable">{sys:druid.log.path}</span><span class="xml"><span class="hljs-tag"><span class="hljs-string">/$</span></span></span><span class="hljs-template-variable">{sys:druid.node.type}</span><span class="xml"><span class="hljs-tag"><span class="hljs-string">.log"</span> |
| <span class="hljs-attr">filePattern</span>=<span class="hljs-string">"$</span></span></span><span class="hljs-template-variable">{sys:druid.log.path}</span><span class="xml"><span class="hljs-tag"><span class="hljs-string">/$</span></span></span><span class="hljs-template-variable">{sys:druid.node.type}</span><span class="xml"><span class="hljs-tag"><span class="hljs-string">.%d</span></span></span><span class="hljs-template-variable">{yyyyMMdd}</span><span class="xml"><span class="hljs-tag"><span class="hljs-string">.log"</span>></span> |
| <span class="hljs-tag"><<span class="hljs-name">PatternLayout</span> <span class="hljs-attr">pattern</span>=<span class="hljs-string">"%d</span></span></span><span class="hljs-template-variable">{ISO8601}</span><span class="xml"><span class="hljs-tag"><span class="hljs-string"> %p [%t] %c - %m%n"</span>/></span> |
| <span class="hljs-tag"><<span class="hljs-name">Policies</span>></span> |
| <span class="hljs-tag"><<span class="hljs-name">TimeBasedTriggeringPolicy</span> <span class="hljs-attr">interval</span>=<span class="hljs-string">"1"</span> <span class="hljs-attr">modulate</span>=<span class="hljs-string">"true"</span>/></span> |
| <span class="hljs-tag"></<span class="hljs-name">Policies</span>></span> |
| <span class="hljs-tag"><<span class="hljs-name">DefaultRolloverStrategy</span>></span> |
| <span class="hljs-tag"><<span class="hljs-name">Delete</span> <span class="hljs-attr">basePath</span>=<span class="hljs-string">"$</span></span></span><span class="hljs-template-variable">{sys:druid.log.path}</span><span class="xml"><span class="hljs-tag"><span class="hljs-string">/"</span> <span class="hljs-attr">maxDepth</span>=<span class="hljs-string">"1"</span>></span> |
| <span class="hljs-tag"><<span class="hljs-name">IfFileName</span> <span class="hljs-attr">glob</span>=<span class="hljs-string">"*.log"</span> /></span> |
| <span class="hljs-tag"><<span class="hljs-name">IfLastModified</span> <span class="hljs-attr">age</span>=<span class="hljs-string">"7d"</span> /></span> |
| <span class="hljs-tag"></<span class="hljs-name">Delete</span>></span> |
| <span class="hljs-tag"></<span class="hljs-name">DefaultRolloverStrategy</span>></span> |
| <span class="hljs-tag"></<span class="hljs-name">RollingRandomAccessFile</span>></span> |
| |
| <span class="hljs-tag"></<span class="hljs-name">Appenders</span>></span> |
| |
| <span class="hljs-tag"><<span class="hljs-name">Loggers</span>></span> |
| <span class="hljs-tag"><<span class="hljs-name">Root</span> <span class="hljs-attr">level</span>=<span class="hljs-string">"info"</span>></span> |
| <span class="hljs-tag"><<span class="hljs-name">AppenderRef</span> <span class="hljs-attr">ref</span>=<span class="hljs-string">"FileAppender"</span>/></span> |
| <span class="hljs-tag"></<span class="hljs-name">Root</span>></span> |
| |
| <span class="hljs-comment"><!-- Set level="debug" to see stack traces for query errors --></span> |
| <span class="hljs-tag"><<span class="hljs-name">Logger</span> <span class="hljs-attr">name</span>=<span class="hljs-string">"org.apache.druid.server.QueryResource"</span> <span class="hljs-attr">level</span>=<span class="hljs-string">"info"</span> <span class="hljs-attr">additivity</span>=<span class="hljs-string">"false"</span>></span> |
| <span class="hljs-tag"><<span class="hljs-name">Appender-ref</span> <span class="hljs-attr">ref</span>=<span class="hljs-string">"FileAppender"</span>/></span> |
| <span class="hljs-tag"></<span class="hljs-name">Logger</span>></span> |
| <span class="hljs-tag"><<span class="hljs-name">Logger</span> <span class="hljs-attr">name</span>=<span class="hljs-string">"org.apache.druid.server.QueryLifecycle"</span> <span class="hljs-attr">level</span>=<span class="hljs-string">"info"</span> <span class="hljs-attr">additivity</span>=<span class="hljs-string">"false"</span>></span> |
| <span class="hljs-tag"><<span class="hljs-name">Appender-ref</span> <span class="hljs-attr">ref</span>=<span class="hljs-string">"FileAppender"</span>/></span> |
| <span class="hljs-tag"></<span class="hljs-name">Logger</span>></span> |
| |
| <span class="hljs-comment"><!-- Set level="debug" or "trace" to see more Coordinator details (segment balancing, load/drop rules, etc) --></span> |
| <span class="hljs-tag"><<span class="hljs-name">Logger</span> <span class="hljs-attr">name</span>=<span class="hljs-string">"org.apache.druid.server.coordinator"</span> <span class="hljs-attr">level</span>=<span class="hljs-string">"info"</span> <span class="hljs-attr">additivity</span>=<span class="hljs-string">"false"</span>></span> |
| <span class="hljs-tag"><<span class="hljs-name">Appender-ref</span> <span class="hljs-attr">ref</span>=<span class="hljs-string">"FileAppender"</span>/></span> |
| <span class="hljs-tag"></<span class="hljs-name">Logger</span>></span> |
| |
| <span class="hljs-comment"><!-- Set level="debug" to see low-level details about segments and ingestion --></span> |
| <span class="hljs-tag"><<span class="hljs-name">Logger</span> <span class="hljs-attr">name</span>=<span class="hljs-string">"org.apache.druid.segment"</span> <span class="hljs-attr">level</span>=<span class="hljs-string">"info"</span> <span class="hljs-attr">additivity</span>=<span class="hljs-string">"false"</span>></span> |
| <span class="hljs-tag"><<span class="hljs-name">Appender-ref</span> <span class="hljs-attr">ref</span>=<span class="hljs-string">"FileAppender"</span>/></span> |
| <span class="hljs-tag"></<span class="hljs-name">Logger</span>></span> |
| |
| <span class="hljs-comment"><!-- Set level="debug" to see more information about extension initialization --></span> |
| <span class="hljs-tag"><<span class="hljs-name">Logger</span> <span class="hljs-attr">name</span>=<span class="hljs-string">"org.apache.druid.initialization"</span> <span class="hljs-attr">level</span>=<span class="hljs-string">"info"</span> <span class="hljs-attr">additivity</span>=<span class="hljs-string">"false"</span>></span> |
| <span class="hljs-tag"><<span class="hljs-name">Appender-ref</span> <span class="hljs-attr">ref</span>=<span class="hljs-string">"FileAppender"</span>/></span> |
| <span class="hljs-tag"></<span class="hljs-name">Logger</span>></span> |
| |
| <span class="hljs-comment"><!-- Quieter logging at startup --></span> |
| <span class="hljs-tag"><<span class="hljs-name">Logger</span> <span class="hljs-attr">name</span>=<span class="hljs-string">"org.skife.config"</span> <span class="hljs-attr">level</span>=<span class="hljs-string">"warn"</span> <span class="hljs-attr">additivity</span>=<span class="hljs-string">"false"</span>></span> |
| <span class="hljs-tag"><<span class="hljs-name">Appender-ref</span> <span class="hljs-attr">ref</span>=<span class="hljs-string">"FileAppender"</span>/></span> |
| <span class="hljs-tag"></<span class="hljs-name">Logger</span>></span> |
| <span class="hljs-tag"><<span class="hljs-name">Logger</span> <span class="hljs-attr">name</span>=<span class="hljs-string">"com.sun.jersey.guice"</span> <span class="hljs-attr">level</span>=<span class="hljs-string">"warn"</span> <span class="hljs-attr">additivity</span>=<span class="hljs-string">"false"</span>></span> |
| <span class="hljs-tag"><<span class="hljs-name">Appender-ref</span> <span class="hljs-attr">ref</span>=<span class="hljs-string">"FileAppender"</span>/></span> |
| <span class="hljs-tag"></<span class="hljs-name">Logger</span>></span> |
| <span class="hljs-tag"></<span class="hljs-name">Loggers</span>></span> |
| <span class="hljs-tag"></<span class="hljs-name">Configuration</span>></span> |
| </span></code></pre> |
| <blockquote> |
| <p>NOTE: |
| Although Druid shares the log4j configuration file task peon processes, |
| the appenders in this file DO NOT take effect for peon processes. Peons always output logs to standard output. |
| Middle Managers redirect task logs from standard output to <a href="/docs/26.0.0/configuration/index.html#log-long-term-storage">long-term storage</a>.</p> |
| <p>However, log level settings do take effect for these task peon processes. |
| This means you can configure loggers at different logging level for task logs using <code>log4j2.xml</code>.</p> |
| </blockquote> |
| <h2><a class="anchor" aria-hidden="true" id="log-directory"></a><a href="#log-directory" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Log directory</h2> |
| <p>The included log4j2.xml configuration for Druid and ZooKeeper writes logs to the <code>log</code> directory at the root of the distribution.</p> |
| <p>If you want to change the log directory, set the environment variable <code>DRUID_LOG_DIR</code> to the right directory before you start Druid.</p> |
| <h2><a class="anchor" aria-hidden="true" id="all-in-one-start-commands"></a><a href="#all-in-one-start-commands" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>All-in-one start commands</h2> |
| <p>If you use one of the all-in-one start commands, such as <code>bin/start-micro-quickstart</code>, the default configuration for each service has two kinds of log files. |
| Log4j2 writes the main log file and rotates it periodically. |
| For example, <code>log/historical.log</code>.</p> |
| <p>The secondary log file contains anything that is written by the component |
| directly to standard output or standard error without going through log4j2. |
| For example, <code>log/historical.stdout.log</code>. |
| This consists mainly of messages from the |
| Java runtime itself. |
| This file is not rotated, but it is generally small due to the low volume of messages. |
| If necessary, you can truncate it using the Linux command <code>truncate --size 0 log/historical.stdout.log</code>.</p> |
| <h2><a class="anchor" aria-hidden="true" id="avoid-reflective-access-warnings-in-logs"></a><a href="#avoid-reflective-access-warnings-in-logs" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Avoid reflective access warnings in logs</h2> |
| <p>On Java 11, you may see warnings like the following in the logs:</p> |
| <pre><code class="hljs"><span class="hljs-symbol">WARNING: </span>An illegal reflective access operation has occurred |
| <span class="hljs-symbol">WARNING: </span>Use --illegal-access=warn to enable warnings of further illegal reflective access operations |
| <span class="hljs-symbol">WARNING: </span>All illegal access operations will be denied in a future release |
| </code></pre> |
| <p>To avoid these, add the <code>--add-exports</code> and <code>--add-opens</code> command line parameters described in the documentation section |
| about <a href="/docs/26.0.0/operations/java.html#strong-encapsulation">Java strong encapsulation</a>.</p> |
| <h2><a class="anchor" aria-hidden="true" id="set-the-logs-to-asynchronously-write"></a><a href="#set-the-logs-to-asynchronously-write" aria-hidden="true" class="hash-link"><svg class="hash-link-icon" aria-hidden="true" height="16" version="1.1" viewBox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>Set the logs to asynchronously write</h2> |
| <p>If your logs are really chatty, you can set them to write asynchronously. |
| The following example shows a <code>log4j2.xml</code> that configures some of the more chatty classes to write asynchronously:</p> |
| <pre><code class="hljs"><span class="xml"><span class="hljs-meta"><?xml version="1.0" encoding="UTF-8" ?></span> |
| <span class="hljs-tag"><<span class="hljs-name">Configuration</span> <span class="hljs-attr">status</span>=<span class="hljs-string">"WARN"</span>></span> |
| <span class="hljs-tag"><<span class="hljs-name">Appenders</span>></span> |
| <span class="hljs-tag"><<span class="hljs-name">Console</span> <span class="hljs-attr">name</span>=<span class="hljs-string">"Console"</span> <span class="hljs-attr">target</span>=<span class="hljs-string">"SYSTEM_OUT"</span>></span> |
| <span class="hljs-tag"><<span class="hljs-name">PatternLayout</span> <span class="hljs-attr">pattern</span>=<span class="hljs-string">"%d</span></span></span><span class="hljs-template-variable">{ISO8601}</span><span class="xml"><span class="hljs-tag"><span class="hljs-string"> %p [%t] %c - %m%n"</span>/></span> |
| <span class="hljs-tag"></<span class="hljs-name">Console</span>></span> |
| <span class="hljs-tag"></<span class="hljs-name">Appenders</span>></span> |
| |
| <span class="hljs-tag"><<span class="hljs-name">Loggers</span>></span> |
| <span class="hljs-comment"><!-- AsyncLogger instead of Logger --></span> |
| <span class="hljs-tag"><<span class="hljs-name">AsyncLogger</span> <span class="hljs-attr">name</span>=<span class="hljs-string">"org.apache.druid.curator.inventory.CuratorInventoryManager"</span> <span class="hljs-attr">level</span>=<span class="hljs-string">"debug"</span> <span class="hljs-attr">additivity</span>=<span class="hljs-string">"false"</span>></span> |
| <span class="hljs-tag"><<span class="hljs-name">AppenderRef</span> <span class="hljs-attr">ref</span>=<span class="hljs-string">"Console"</span>/></span> |
| <span class="hljs-tag"></<span class="hljs-name">AsyncLogger</span>></span> |
| <span class="hljs-tag"><<span class="hljs-name">AsyncLogger</span> <span class="hljs-attr">name</span>=<span class="hljs-string">"org.apache.druid.client.BatchServerInventoryView"</span> <span class="hljs-attr">level</span>=<span class="hljs-string">"debug"</span> <span class="hljs-attr">additivity</span>=<span class="hljs-string">"false"</span>></span> |
| <span class="hljs-tag"><<span class="hljs-name">AppenderRef</span> <span class="hljs-attr">ref</span>=<span class="hljs-string">"Console"</span>/></span> |
| <span class="hljs-tag"></<span class="hljs-name">AsyncLogger</span>></span> |
| <span class="hljs-comment"><!-- Make extra sure nobody adds logs in a bad way that can hurt performance --></span> |
| <span class="hljs-tag"><<span class="hljs-name">AsyncLogger</span> <span class="hljs-attr">name</span>=<span class="hljs-string">"org.apache.druid.client.ServerInventoryView"</span> <span class="hljs-attr">level</span>=<span class="hljs-string">"debug"</span> <span class="hljs-attr">additivity</span>=<span class="hljs-string">"false"</span>></span> |
| <span class="hljs-tag"><<span class="hljs-name">AppenderRef</span> <span class="hljs-attr">ref</span>=<span class="hljs-string">"Console"</span>/></span> |
| <span class="hljs-tag"></<span class="hljs-name">AsyncLogger</span>></span> |
| <span class="hljs-tag"><<span class="hljs-name">AsyncLogger</span> <span class="hljs-attr">name</span> =<span class="hljs-string">"org.apache.druid.java.util.http.client.pool.ChannelResourceFactory"</span> <span class="hljs-attr">level</span>=<span class="hljs-string">"info"</span> <span class="hljs-attr">additivity</span>=<span class="hljs-string">"false"</span>></span> |
| <span class="hljs-tag"><<span class="hljs-name">AppenderRef</span> <span class="hljs-attr">ref</span>=<span class="hljs-string">"Console"</span>/></span> |
| <span class="hljs-tag"></<span class="hljs-name">AsyncLogger</span>></span> |
| <span class="hljs-tag"><<span class="hljs-name">Root</span> <span class="hljs-attr">level</span>=<span class="hljs-string">"info"</span>></span> |
| <span class="hljs-tag"><<span class="hljs-name">AppenderRef</span> <span class="hljs-attr">ref</span>=<span class="hljs-string">"Console"</span>/></span> |
| <span class="hljs-tag"></<span class="hljs-name">Root</span>></span> |
| <span class="hljs-tag"></<span class="hljs-name">Loggers</span>></span> |
| <span class="hljs-tag"></<span class="hljs-name">Configuration</span>></span> |
| </span></code></pre> |
| </span></div></article></div><div class="docs-prevnext"><a class="docs-prev button" href="/docs/26.0.0/development/extensions.html"><span class="arrow-prev">← </span><span>Extensions</span></a><a class="docs-next button" href="/docs/26.0.0/operations/web-console.html"><span>Web console</span><span class="arrow-next"> →</span></a></div></div></div><nav class="onPageNav"><ul class="toc-headings"><li><a href="#log-directory">Log directory</a></li><li><a href="#all-in-one-start-commands">All-in-one start commands</a></li><li><a href="#avoid-reflective-access-warnings-in-logs">Avoid reflective access warnings in logs</a></li><li><a href="#set-the-logs-to-asynchronously-write">Set the logs to asynchronously write</a></li></ul></nav></div><footer class="nav-footer druid-footer" id="footer"><div class="container"><div class="text-center"><p><a href="/technology">Technology</a> · <a href="/use-cases">Use Cases</a> · <a href="/druid-powered">Powered by Druid</a> · <a href="/docs/26.0.0/">Docs</a> · <a href="/community/">Community</a> · <a href="/downloads.html">Download</a> · <a href="/faq">FAQ</a></p></div><div class="text-center"><a title="Join the user group" href="https://groups.google.com/forum/#!forum/druid-user" target="_blank"><span class="fa fa-comments"></span></a> · <a title="Follow Druid" href="https://twitter.com/druidio" target="_blank"><span class="fab fa-twitter"></span></a> · <a title="Download via Apache" href="https://www.apache.org/dyn/closer.cgi?path=/incubator/druid/{{ site.druid_versions[0].versions[0].version }}/apache-druid-{{ site.druid_versions[0].versions[0].version }}-bin.tar.gz" target="_blank"><span class="fas fa-feather"></span></a> · <a title="GitHub" href="https://github.com/apache/druid" target="_blank"><span class="fab fa-github"></span></a></div><div class="text-center license">Copyright © 2022 <a href="https://www.apache.org/" target="_blank">Apache Software Foundation</a>.<br/>Except where otherwise noted, licensed under <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a>.<br/>Apache Druid, Druid, and the Druid logo are either registered trademarks or trademarks of The Apache Software Foundation in the United States and other countries.</div></div></footer></div><script type="text/javascript" src="https://cdn.jsdelivr.net/npm/docsearch.js@2/dist/cdn/docsearch.min.js"></script><script> |
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