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Gokulso/log4j iceberg appender #4104

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626938d
feat: add log4j-iceberg appender module for writing logs to Apache Ic…
gsoundar Apr 21, 2026
0a92bfb
test: add unit tests for log4j-iceberg with 100% line coverage
gsoundar Apr 21, 2026
7d6a27a
test: add performance benchmark comparing Iceberg and File appenders
gsoundar Apr 21, 2026
cb95624
test: add Iceberg table inspection test for manual exploration
gsoundar Apr 21, 2026
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226 changes: 226 additions & 0 deletions log4j-iceberg/pom.xml
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<?xml version="1.0" encoding="UTF-8"?>
<!--
~ Licensed to the Apache Software Foundation (ASF) under one or more
~ contributor license agreements. See the NOTICE file distributed with
~ this work for additional information regarding copyright ownership.
~ The ASF licenses this file to you under the Apache License, Version 2.0
~ (the "License"); you may not use this file except in compliance with
~ the License. You may obtain a copy of the License at
~
~ http://www.apache.org/licenses/LICENSE-2.0
~
~ Unless required by applicable law or agreed to in writing, software
~ distributed under the License is distributed on an "AS IS" BASIS,
~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
~ See the License for the specific language governing permissions and
~ limitations under the License.
-->
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">

<modelVersion>4.0.0</modelVersion>

<parent>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j</artifactId>
<version>${revision}</version>
<relativePath>../log4j-parent</relativePath>
</parent>

<artifactId>log4j-iceberg</artifactId>

<name>Apache Log4j Iceberg</name>
<description>Apache Iceberg appender for Log4j. Writes log events as rows in an Iceberg table using Parquet files.</description>

<properties>
<Fragment-Host>org.apache.logging.log4j.core</Fragment-Host>
<iceberg.version>1.10.1</iceberg.version>
<parquet.version>1.16.0</parquet.version>
<hadoop.version>3.4.1</hadoop.version>
</properties>

<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.xerial.snappy</groupId>
<artifactId>snappy-java</artifactId>
<version>1.1.10.7</version>
</dependency>
<dependency>
<groupId>io.airlift</groupId>
<artifactId>aircompressor</artifactId>
<version>2.0.2</version>
</dependency>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-text</artifactId>
<version>1.11.0</version>
</dependency>
</dependencies>
</dependencyManagement>

<dependencies>

<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-core</artifactId>
</dependency>

<!-- Iceberg core + Parquet support -->
<dependency>
<groupId>org.apache.iceberg</groupId>
<artifactId>iceberg-core</artifactId>
<version>${iceberg.version}</version>
</dependency>
<dependency>
<groupId>org.apache.iceberg</groupId>
<artifactId>iceberg-parquet</artifactId>
<version>${iceberg.version}</version>
</dependency>
<dependency>
<groupId>org.apache.iceberg</groupId>
<artifactId>iceberg-data</artifactId>
<version>${iceberg.version}</version>
</dependency>
<dependency>
<groupId>org.apache.iceberg</groupId>
<artifactId>iceberg-api</artifactId>
<version>${iceberg.version}</version>
</dependency>

<!-- Parquet -->
<dependency>
<groupId>org.apache.parquet</groupId>
<artifactId>parquet-avro</artifactId>
<version>${parquet.version}</version>
</dependency>

<!-- Hadoop (needed by Iceberg for local/S3 file IO and Parquet) -->
<dependency>
<groupId>org.apache.hadoop</groupId>
<artifactId>hadoop-common</artifactId>
<version>${hadoop.version}</version>
<exclusions>
<exclusion>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-reload4j</artifactId>
</exclusion>
<exclusion>
<groupId>ch.qos.reload4j</groupId>
<artifactId>reload4j</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.apache.hadoop</groupId>
<artifactId>hadoop-mapreduce-client-core</artifactId>
<version>${hadoop.version}</version>
<exclusions>
<exclusion>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-reload4j</artifactId>
</exclusion>
<exclusion>
<groupId>ch.qos.reload4j</groupId>
<artifactId>reload4j</artifactId>
</exclusion>
<exclusion>
<groupId>org.apache.hadoop</groupId>
<artifactId>hadoop-yarn-common</artifactId>
</exclusion>
<exclusion>
<groupId>org.apache.hadoop</groupId>
<artifactId>hadoop-yarn-client</artifactId>
</exclusion>
<exclusion>
<groupId>org.apache.hadoop</groupId>
<artifactId>hadoop-hdfs-client</artifactId>
</exclusion>
</exclusions>
</dependency>

<!-- Test dependencies -->
<dependency>
<groupId>org.junit.jupiter</groupId>
<artifactId>junit-jupiter-engine</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-core-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.mockito</groupId>
<artifactId>mockito-core</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.assertj</groupId>
<artifactId>assertj-core</artifactId>
<version>3.26.3</version>
<scope>test</scope>
</dependency>

</dependencies>

<build>
<plugins>
<!-- No previous release exists for this new module -->
<plugin>
<groupId>biz.aQute.bnd</groupId>
<artifactId>bnd-baseline-maven-plugin</artifactId>
<executions>
<execution>
<id>check-api-compat</id>
<goals>
<goal>baseline</goal>
</goals>
<configuration>
<skip>true</skip>
</configuration>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.jacoco</groupId>
<artifactId>jacoco-maven-plugin</artifactId>
<version>0.8.12</version>
<executions>
<execution>
<goals>
<goal>prepare-agent</goal>
</goals>
</execution>
<execution>
<id>report</id>
<goals>
<goal>report</goal>
</goals>
<phase>test</phase>
</execution>
<execution>
<id>check</id>
<goals>
<goal>check</goal>
</goals>
<configuration>
<rules>
<rule>
<element>BUNDLE</element>
<limits>
<limit>
<counter>LINE</counter>
<value>COVEREDRATIO</value>
<minimum>1.00</minimum>
</limit>
</limits>
</rule>
</rules>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
</build>

</project>
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