| work with the classloader isolation option (<code>mapreduce.job.classloader = true</code>).</p><p><strong>Alternate workaround - 1</strong></p><p>You can try editing Druid's pom.xml dependencies to match the version of Jackson in your Hadoop version and recompile Druid.</p><p>For more about building Druid, please see <a href="/docs/latest/development/build">Building Druid</a>.</p><p><strong>Alternate workaround - 2</strong></p><p>Another workaround solution is to build a custom fat jar of Druid using <a href="http://www.scala-sbt.org/" target="_blank" rel="noopener noreferrer">sbt</a>, which manually excludes all the conflicting Jackson dependencies, and then put this fat jar in the classpath of the command that starts Overlord indexing service. To do this, please follow the following steps.</p><p>(1) Download and install sbt.</p><p>(2) Make a new directory named 'druid_build'.</p><p>(3) Cd to 'druid_build' and create the build.sbt file with the content <a href="/docs/latest/operations/use_sbt_to_build_fat_jar">here</a>.</p><p>You can always add more building targets or remove the ones you don't need.</p><p>(4) In the same directory create a new directory named 'project'.</p><p>(5) Put the druid source code into 'druid_build/project'.</p><p>(6) Create a file 'druid_build/project/assembly.sbt' with content as follows.</p><div class="codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-text codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#bfc7d5"><span class="token plain">addSbtPlugin("com.eed3si9n" % "sbt-assembly" % "0.13.0")</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>(7) In the 'druid_build' directory, run 'sbt assembly'.</p><p>(8) In the 'druid_build/target/scala-2.10' folder, you will find the fat jar you just build.</p><p>(9) Make sure the jars you've uploaded has been completely removed. The HDFS directory is by default '/tmp/druid-indexing/classpath'.</p><p>(10) Include the fat jar in the classpath when you start the indexing service. Make sure you've removed 'lib/*' from your classpath because now the fat jar includes all you need.</p><p><strong>Alternate workaround - 3</strong></p><p>If sbt is not your choice, you can also use <code>maven-shade-plugin</code> to make a fat jar: relocation all Jackson packages will resolve it too. In this way, druid will not be affected by Jackson library embedded in hadoop. Please follow the steps below:</p><p>(1) Add all extensions you needed to <code>services/pom.xml</code> like</p><div class="language-xml codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-xml codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#bfc7d5"><span class="token tag punctuation" style="color:rgb(199, 146, 234)"><</span><span class="token tag" style="color:rgb(255, 85, 114)">dependency</span><span class="token tag punctuation" style="color:rgb(199, 146, 234)">></span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token tag punctuation" style="color:rgb(199, 146, 234)"><</span><span class="token tag" style="color:rgb(255, 85, 114)">groupId</span><span class="token tag punctuation" style="color:rgb(199, 146, 234)">></span><span class="token plain">org.apache.druid.extensions</span><span class="token tag punctuation" style="color:rgb(199, 146, 234)"></</span><span class="token tag" style="color:rgb(255, 85, 114)">groupId</span><span class="token tag punctuation" style="color:rgb(199, 146, 234)">></span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token tag punctuation" style="color:rgb(199, 146, 234)"><</span><span class="token tag" style="color:rgb(255, 85, 114)">artifactId</span><span class="token tag punctuation" style="color:rgb(199, 146, 234)">></span><span class="token plain">druid-avro-extensions</span><span class="token tag punctuation" style="color:rgb(199, 146, 234)"></</span><span class="token tag" style="color:rgb(255, 85, 114)">artifactId</span><span class="token tag punctuation" style="color:rgb(199, 146, 234)">></span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token tag punctuation" style="color:rgb(199, 146, 234)"><</span><span class="token tag" style="color:rgb(255, 85, 114)">version</span><span class="token tag punctuation" style="color:rgb(199, 146, 234)">></span><span class="token plain">${project.parent.version}</span><span class="token tag punctuation" style="color:rgb(199, 146, 234)"></</span><span class="token tag" style="color:rgb(255, 85, 114)">version</span><span class="token tag punctuation" style="color:rgb(199, 146, 234)">></span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token tag punctuation" style="color:rgb(199, 146, 234)"></</span><span class="token tag" style="color:rgb(255, 85, 114)">dependency</span><span class="token tag punctuation" style="color:rgb(199, 146, 234)">></span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token tag punctuation" style="color:rgb(199, 146, 234)"><</span><span class="token tag" style="color:rgb(255, 85, 114)">dependency</span><span class="token tag punctuation" style="color:rgb(199, 146, 234)">></span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token tag punctuation" style="color:rgb(199, 146, 234)"><</span><span class="token tag" style="color:rgb(255, 85, 114)">groupId</span><span class="token tag punctuation" style="color:rgb(199, 146, 234)">></span><span class="token plain">org.apache.druid.extensions</span><span class="token tag punctuation" style="color:rgb(199, 146, 234)"></</span><span class="token tag" style="color:rgb(255, 85, 114)">groupId</span><span class="token tag punctuation" style="color:rgb(199, 146, 234)">></span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token tag punctuation" style="color:rgb(199, 146, 234)"><</span><span class="token tag" style="color:rgb(255, 85, 114)">artifactId</span><span class="token tag punctuation" style="color:rgb(199, 146, 234)">></span><span class="token plain">druid-parquet-extensions</span><span class="token tag punctuation" style="color:rgb(199, 146, 234)"></</span><span class="token tag" style="color:rgb(255, 85, 114)">artifactId</span><span class="token tag punctuation" style="color:rgb(199, 146, 234)">></span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token tag punctuation" style="color:rgb(199, 146, 234)"><</span><span class="token tag" style="color:rgb(255, 85, 114)">version</span><span class="token tag punctuation" style="color:rgb(199, 146, 234)">></span><span class="token plain">${project.parent.version}</span><span class="token tag punctuation" style="color:rgb(199, 146, 234)"></</span><span class="token tag" style="color:rgb(255, 85, 114)">version</span><span class="token tag punctuation" style="color:rgb(199, 146, 234)">></span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token tag punctuation" style="color:rgb(199, 146, 234)"></</span><span class="token tag" style="color:rgb(255, 85, 114)">dependency</span><span class="token tag punctuation" style="color:rgb(199, 146, 234)">></span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token tag punctuation" style="color:rgb(199, 146, 234)"><</span><span class="token tag" style="color:rgb(255, 85, 114)">dependency</span><span class="token tag punctuation" style="color:rgb(199, 146, 234)">></span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token tag punctuation" style="color:rgb(199, 146, 234)"><</span><span class="token tag" style="color:rgb(255, 85, 114)">groupId</span><span class="token tag punctuation" style="color:rgb(199, 146, 234)">></span><span class="token plain">org.apache.druid.extensions</span><span class="token tag punctuation" style="color:rgb(199, 146, 234)"></</span><span class="token tag" style="color:rgb(255, 85, 114)">groupId</span><span class="token tag punctuation" style="color:rgb(199, 146, 234)">></span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token tag punctuation" style="color:rgb(199, 146, 234)"><</span><span class="token tag" style="color:rgb(255, 85, 114)">artifactId</span><span class="token tag punctuation" style="color:rgb(199, 146, 234)">></span><span class="token plain">druid-hdfs-storage</span><span class="token tag punctuation" style="color:rgb(199, 146, 234)"></</span><span class="token tag" style="color:rgb(255, 85, 114)">artifactId</span><span class="token tag punctuation" style="color:rgb(199, 146, 234)">></span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token tag punctuation" style="color:rgb(199, 146, 234)"><</span><span class="token tag" style="color:rgb(255, 85, 114)">version</span><span class="token tag punctuation" style="color:rgb(199, 146, 234)">></span><span class="token plain">${project.parent.version}</span><span class="token tag punctuation" style="color:rgb(199, 146, 234)"></</span><span class="token tag" style="color:rgb(255, 85, 114)">version</span><span class="token tag punctuation" style="color:rgb(199, 146, 234)">></span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token tag punctuation" style="color:rgb(199, 146, 234)"></</span><span class="token tag" style="color:rgb(255, 85, 114)">dependency</span><span class="token tag punctuation" style="color:rgb(199, 146, 234)">></span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token tag punctuation" style="color:rgb(199, 146, 234)"><</span><span class="token tag" style="color:rgb(255, 85, 114)">dependency</span><span class="token tag punctuation" style="color:rgb(199, 146, 234)">></span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token tag punctuation" style="color:rgb(199, 146, 234)"><</span><span class="token tag" style="color:rgb(255, 85, 114)">groupId</span><span class="token tag punctuation" style="color:rgb(199, 146, 234)">></span><span class="token plain">org.apache.druid.extensions</span><span class="token tag punctuation" style="color:rgb(199, 146, 234)"></</span><span class="token tag" style="color:rgb(255, 85, 114)">groupId</span><span class="token tag punctuation" style="color:rgb(199, 146, 234)">></span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token tag punctuation" style="color:rgb(199, 146, 234)"><</span><span class="token tag" style="color:rgb(255, 85, 114)">artifactId</span><span class="token tag punctuation" style="color:rgb(199, 146, 234)">></span><span class="token plain">mysql-metadata-storage</span><span class="token tag punctuation" style="color:rgb(199, 146, 234)"></</span><span class="token tag" style="color:rgb(255, 85, 114)">artifactId</span><span class="token tag punctuation" style="color:rgb(199, 146, 234)">></span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token tag punctuation" style="color:rgb(199, 146, 234)"><</span><span class="token tag" style="color:rgb(255, 85, 114)">version</span><span class="token tag punctuation" style="color:rgb(199, 146, 234)">></span><span class="token plain">${project.parent.version}</span><span class="token tag punctuation" style="color:rgb(199, 146, 234)"></</span><span class="token tag" style="color:rgb(255, 85, 114)">version</span><span class="token tag punctuation" style="color:rgb(199, 146, 234)">></span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token tag punctuation" style="color:rgb(199, 146, 234)"></</span><span class="token tag" style="color:rgb(255, 85, 114)">dependency</span><span class="token tag punctuation" style="color:rgb(199, 146, 234)">></span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>(2) Shade Jackson packages and assemble a fat jar.</p><div class="language-xml codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-xml codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#bfc7d5"><span class="token tag punctuation" style="color:rgb(199, 146, 234)"><</span><span class="token tag" style="color:rgb(255, 85, 114)">plugin</span><span class="token tag punctuation" style="color:rgb(199, 146, 234)">></span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token tag punctuation" style="color:rgb(199, 146, 234)"><</span><span class="token tag" style="color:rgb(255, 85, 114)">groupId</span><span class="token tag punctuation" style="color:rgb(199, 146, 234)">></span><span class="token plain">org.apache.maven.plugins</span><span class="token tag punctuation" style="color:rgb(199, 146, 234)"></</span><span class="token tag" style="color:rgb(255, 85, 114)">groupId</span><span class="token tag punctuation" style="color:rgb(199, 146, 234)">></span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token tag punctuation" style="color:rgb(199, 146, 234)"><</span><span class="token tag" style="color:rgb(255, 85, 114)">artifactId</span><span class="token tag punctuation" style="color:rgb(199, 146, 234)">></span><span class="token plain">maven-shade-plugin</span><span class="token tag punctuation" style="color:rgb(199, 146, 234)"></</span><span class="token tag" style="color:rgb(255, 85, 114)">artifactId</span><span class="token tag punctuation" style="color:rgb(199, 146, 234)">></span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token tag punctuation" style="color:rgb(199, 146, 234)"><</span><span class="token tag" style="color:rgb(255, 85, 114)">executions</span><span class="token tag punctuation" style="color:rgb(199, 146, 234)">></span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token tag punctuation" style="color:rgb(199, 146, 234)"><</span><span class="token tag" style="color:rgb(255, 85, 114)">execution</span><span class="token tag punctuation" style="color:rgb(199, 146, 234)">></span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token tag punctuation" style="color:rgb(199, 146, 234)"><</span><span class="token tag" style="color:rgb(255, 85, 114)">phase</span><span class="token tag punctuation" style="color:rgb(199, 146, 234)">></span><span class="token plain">package</span><span class="token tag punctuation" style="color:rgb(199, 146, 234)"></</span><span class="token tag" style="color:rgb(255, 85, 114)">phase</span><span class="token tag punctuation" style="color:rgb(199, 146, 234)">></span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token tag punctuation" style="color:rgb(199, 146, 234)"><</span><span class="token tag" style="color:rgb(255, 85, 114)">goals</span><span class="token tag punctuation" style="color:rgb(199, 146, 234)">></span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token tag punctuation" style="color:rgb(199, 146, 234)"><</span><span class="token tag" style="color:rgb(255, 85, 114)">goal</span><span class="token tag punctuation" style="color:rgb(199, 146, 234)">></span><span class="token plain">shade</span><span class="token tag punctuation" style="color:rgb(199, 146, 234)"></</span><span class="token tag" style="color:rgb(255, 85, 114)">goal</span><span class="token tag punctuation" style="color:rgb(199, 146, 234)">></span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token tag punctuation" style="color:rgb(199, 146, 234)"></</span><span class="token tag" style="color:rgb(255, 85, 114)">goals</span><span class="token tag punctuation" style="color:rgb(199, 146, 234)">></span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token tag punctuation" style="color:rgb(199, 146, 234)"><</span><span class="token tag" style="color:rgb(255, 85, 114)">configuration</span><span class="token tag punctuation" style="color:rgb(199, 146, 234)">></span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token tag punctuation" style="color:rgb(199, 146, 234)"><</span><span class="token tag" style="color:rgb(255, 85, 114)">outputFile</span><span class="token tag punctuation" style="color:rgb(199, 146, 234)">></span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> ${project.build.directory}/${project.artifactId}-${project.version}-selfcontained.jar</span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token tag punctuation" style="color:rgb(199, 146, 234)"></</span><span class="token tag" style="color:rgb(255, 85, 114)">outputFile</span><span class="token tag punctuation" style="color:rgb(199, 146, 234)">></span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token tag punctuation" style="color:rgb(199, 146, 234)"><</span><span class="token tag" style="color:rgb(255, 85, 114)">relocations</span><span class="token tag punctuation" style="color:rgb(199, 146, 234)">></span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token tag punctuation" style="color:rgb(199, 146, 234)"><</span><span class="token tag" style="color:rgb(255, 85, 114)">relocation</span><span class="token tag punctuation" style="color:rgb(199, 146, 234)">></span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token tag punctuation" style="color:rgb(199, 146, 234)"><</span><span class="token tag" style="color:rgb(255, 85, 114)">pattern</span><span class="token tag punctuation" style="color:rgb(199, 146, 234)">></span><span class="token plain">com.fasterxml.jackson</span><span class="token tag punctuation" style="color:rgb(199, 146, 234)"></</span><span class="token tag" style="color:rgb(255, 85, 114)">pattern</span><span class="token tag punctuation" style="color:rgb(199, 146, 234)">></span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token tag punctuation" style="color:rgb(199, 146, 234)"><</span><span class="token tag" style="color:rgb(255, 85, 114)">shadedPattern</span><span class="token tag punctuation" style="color:rgb(199, 146, 234)">></span><span class="token plain">shade.com.fasterxml.jackson</span><span class="token tag punctuation" style="color:rgb(199, 146, 234)"></</span><span class="token tag" style="color:rgb(255, 85, 114)">shadedPattern</span><span class="token tag punctuation" style="color:rgb(199, 146, 234)">></span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token tag punctuation" style="color:rgb(199, 146, 234)"></</span><span class="token tag" style="color:rgb(255, 85, 114)">relocation</span><span class="token tag punctuation" style="color:rgb(199, 146, 234)">></span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token tag punctuation" style="color:rgb(199, 146, 234)"></</span><span class="token tag" style="color:rgb(255, 85, 114)">relocations</span><span class="token tag punctuation" style="color:rgb(199, 146, 234)">></span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token tag punctuation" style="color:rgb(199, 146, 234)"><</span><span class="token tag" style="color:rgb(255, 85, 114)">artifactSet</span><span class="token tag punctuation" style="color:rgb(199, 146, 234)">></span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token tag punctuation" style="color:rgb(199, 146, 234)"><</span><span class="token tag" style="color:rgb(255, 85, 114)">includes</span><span class="token tag punctuation" style="color:rgb(199, 146, 234)">></span><span 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plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token tag punctuation" style="color:rgb(199, 146, 234)"></</span><span class="token tag" style="color:rgb(255, 85, 114)">execution</span><span class="token tag punctuation" style="color:rgb(199, 146, 234)">></span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token tag punctuation" style="color:rgb(199, 146, 234)"></</span><span class="token tag" style="color:rgb(255, 85, 114)">executions</span><span class="token tag punctuation" style="color:rgb(199, 146, 234)">></span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token tag punctuation" style="color:rgb(199, 146, 234)"></</span><span class="token tag" style="color:rgb(255, 85, 114)">plugin</span><span class="token tag punctuation" style="color:rgb(199, 146, 234)">></span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>Copy out <code>services/target/xxxxx-selfcontained.jar</code> after <code>mvn install</code> in project root for further usage.</p><p>(3) run hadoop indexer (post an indexing task is not possible now) as below. <code>lib</code> is not needed anymore. As hadoop indexer is a standalone tool, you don't have to replace the jars of your running services:</p><div class="language-bash codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-bash codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#bfc7d5"><span class="token plain">java -Xmx32m </span><span class="token punctuation" style="color:rgb(199, 146, 234)">\</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> -Dfile.encoding</span><span class="token operator" style="color:rgb(137, 221, 255)">=</span><span class="token plain">UTF-8 -Duser.timezone</span><span class="token operator" style="color:rgb(137, 221, 255)">=</span><span class="token plain">UTC </span><span class="token punctuation" style="color:rgb(199, 146, 234)">\</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> -classpath config/hadoop:config/overlord:config/_common:</span><span class="token variable" style="color:rgb(191, 199, 213)">$SELF_CONTAINED_JAR</span><span class="token builtin class-name" style="color:rgb(255, 203, 107)">:</span><span class="token variable" style="color:rgb(191, 199, 213)">$HADOOP_DISTRIBUTION</span><span class="token plain">/etc/hadoop </span><span class="token punctuation" style="color:rgb(199, 146, 234)">\</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> -Djava.security.krb5.conf</span><span class="token operator" style="color:rgb(137, 221, 255)">=</span><span class="token variable" style="color:rgb(191, 199, 213)">$KRB5</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">\</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> org.apache.druid.cli.Main index hadoop </span><span class="token punctuation" style="color:rgb(199, 146, 234)">\</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token variable" style="color:rgb(191, 199, 213)">$config_path</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg viewBox="0 0 24 24" class="copyButtonIcon_y97N"><path fill="currentColor" d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg viewBox="0 0 24 24" class="copyButtonSuccessIcon_LjdS"><path fill="currentColor" d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div></div></article><nav class="pagination-nav docusaurus-mt-lg" aria-label="Docs pages"><a class="pagination-nav__link pagination-nav__link--prev" href="/docs/latest/operations/migrate-from-firehose"><div class="pagination-nav__sublabel">Previous</div><div class="pagination-nav__label">Migrate from firehose</div></a><a class="pagination-nav__link pagination-nav__link--next" href="/docs/latest/operations/dump-segment"><div class="pagination-nav__sublabel">Next</div><div class="pagination-nav__label">dump-segment tool</div></a></nav></div></div><div class="col col--3"><div class="tableOfContents_bqdL thin-scrollbar theme-doc-toc-desktop"><ul class="table-of-contents table-of-contents__left-border"><li><a href="#tip-1-place-hadoop-xmls-on-druid-classpath" class="table-of-contents__link toc-highlight">Tip #1: Place Hadoop XMLs on Druid classpath</a></li><li><a href="#tip-2-classloader-modification-on-hadoop-mapreduce-jobs-only" class="table-of-contents__link toc-highlight">Tip #2: Classloader modification on Hadoop (Map/Reduce jobs only)</a><ul><li><a href="#overriding-specific-classes" class="table-of-contents__link toc-highlight">Overriding specific classes</a></li></ul></li><li><a href="#tip-3-use-specific-versions-of-hadoop-libraries" class="table-of-contents__link toc-highlight">Tip #3: Use specific versions of Hadoop libraries</a><ul><li><a href="#preferred-load-using-druids-standard-mechanism" class="table-of-contents__link toc-highlight">Preferred: Load using Druid's standard mechanism</a></li><li><a href="#alternative-append-your-hadoop-jars-to-the-druid-classpath" class="table-of-contents__link toc-highlight">Alternative: Append your Hadoop jars to the Druid classpath</a></li></ul></li><li><a href="#notes-on-specific-hadoop-distributions" class="table-of-contents__link toc-highlight">Notes on specific Hadoop distributions</a><ul><li><a href="#cdh" class="table-of-contents__link toc-highlight">CDH</a></li></ul></li></ul></div></div></div></div></main></div></div><footer class="footer"><div class="container container-fluid"><div class="footer__bottom text--center"><div class="margin-bottom--sm"><img src="/img/favicon.png" class="themedImage_ToTc themedImage--light_HNdA footer__logo"><img src="/img/favicon.png" class="themedImage_ToTc themedImage--dark_i4oU footer__logo"></div><div class="footer__copyright">Copyright © 2023 Apache Software Foundation. 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