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class="theme-doc-version-banner alert alert--warning margin-bottom--md" role="alert"><div>This is documentation for <!-- -->Apache Hudi<!-- --> <b>0.11.0</b>, which is no longer actively maintained.</div><div class="margin-top--md">For up-to-date documentation, see the <b><a href="/docs/snapshot_exporter">latest version</a></b> (<!-- -->0.14.1<!-- -->).</div></div><div class="docItemContainer_oiyr"><article><span class="theme-doc-version-badge badge badge--secondary">Version: <!-- -->0.11.0</span><div class="tocCollapsible_aw-L theme-doc-toc-mobile tocMobile_Tx6Y"><button type="button" class="clean-btn tocCollapsibleButton_zr6a">On this page</button></div><div class="theme-doc-markdown markdown"><header><h1>Exporter</h1></header><h2 class="anchor anchorWithStickyNavbar_y2LR" id="introduction">Introduction<a class="hash-link" href="#introduction" title="Direct link to heading"></a></h2><p>HoodieSnapshotExporter allows you to copy data from one location to another for backups or other purposes. |
| You can write data as Hudi, Json, Orc, or Parquet file formats. In addition to copying data, you can also repartition data |
| with a provided field or implement custom repartitioning by extending a class shown in detail below.</p><h2 class="anchor anchorWithStickyNavbar_y2LR" id="arguments">Arguments<a class="hash-link" href="#arguments" title="Direct link to heading"></a></h2><p>HoodieSnapshotExporter accepts a reference to a source path and a destination path. The utility will issue a |
| query, perform any repartitioning if required and will write the data as Hudi, parquet, or json format.</p><table><thead><tr><th>Argument</th><th>Description</th><th>Required</th><th>Note</th></tr></thead><tbody><tr><td>--source-base-path</td><td>Base path for the source Hudi dataset to be snapshotted</td><td>required</td><td></td></tr><tr><td>--target-output-path</td><td>Output path for storing a particular snapshot</td><td>required</td><td></td></tr><tr><td>--output-format</td><td>Output format for the exported dataset; accept these values: json,parquet,hudi</td><td>required</td><td></td></tr><tr><td>--output-partition-field</td><td>A field to be used by Spark repartitioning</td><td>optional</td><td>Ignored when "Hudi" or when --output-partitioner is specified.The output dataset's default partition field will inherent from the source Hudi dataset.</td></tr><tr><td>--output-partitioner</td><td>A class to facilitate custom repartitioning</td><td>optional</td><td>Ignored when using output-format "Hudi"</td></tr></tbody></table><h2 class="anchor anchorWithStickyNavbar_y2LR" id="examples">Examples<a class="hash-link" href="#examples" title="Direct link to heading"></a></h2><h3 class="anchor anchorWithStickyNavbar_y2LR" id="copy-a-hudi-dataset">Copy a Hudi dataset<a class="hash-link" href="#copy-a-hudi-dataset" title="Direct link to heading"></a></h3><p>Exporter scans the source dataset and then makes a copy of it to the target output path.</p><div class="codeBlockContainer_J+bg language-bash theme-code-block"><div class="codeBlockContent_csEI bash"><pre tabindex="0" class="prism-code language-bash codeBlock_rtdJ thin-scrollbar" style="color:#F8F8F2;background-color:#282A36"><code class="codeBlockLines_1zSZ"><span class="token-line" style="color:#F8F8F2"><span class="token plain">spark-submit </span><span class="token punctuation" style="color:rgb(248, 248, 242)">\</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> --jars </span><span class="token string" style="color:rgb(255, 121, 198)">"packaging/hudi-spark-bundle/target/hudi-spark-bundle_2.11-0.6.0-SNAPSHOT.jar"</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(248, 248, 242)">\</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> --deploy-mode </span><span class="token string" style="color:rgb(255, 121, 198)">"client"</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(248, 248, 242)">\</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> --class </span><span class="token string" style="color:rgb(255, 121, 198)">"org.apache.hudi.utilities.HoodieSnapshotExporter"</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(248, 248, 242)">\</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> packaging/hudi-utilities-bundle/target/hudi-utilities-bundle_2.11-0.6.0-SNAPSHOT.jar </span><span class="token punctuation" style="color:rgb(248, 248, 242)">\</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> --source-base-path </span><span class="token string" style="color:rgb(255, 121, 198)">"/tmp/"</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(248, 248, 242)">\</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> --target-output-path </span><span class="token string" style="color:rgb(255, 121, 198)">"/tmp/exported/hudi/"</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(248, 248, 242)">\</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> --output-format </span><span class="token string" style="color:rgb(255, 121, 198)">"hudi"</span><br></span></code></pre><button type="button" aria-label="Copy code to clipboard" class="copyButton_M3SB clean-btn">Copy</button></div></div><h3 class="anchor anchorWithStickyNavbar_y2LR" id="export-to-json-or-parquet-dataset">Export to json or parquet dataset<a class="hash-link" href="#export-to-json-or-parquet-dataset" title="Direct link to heading"></a></h3><p>The Exporter can also convert the source dataset into other formats. Currently only "json" and "parquet" are supported.</p><div class="codeBlockContainer_J+bg language-bash theme-code-block"><div class="codeBlockContent_csEI bash"><pre tabindex="0" class="prism-code language-bash codeBlock_rtdJ thin-scrollbar" style="color:#F8F8F2;background-color:#282A36"><code class="codeBlockLines_1zSZ"><span class="token-line" style="color:#F8F8F2"><span class="token plain">spark-submit </span><span class="token punctuation" style="color:rgb(248, 248, 242)">\</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> --jars </span><span class="token string" style="color:rgb(255, 121, 198)">"packaging/hudi-spark-bundle/target/hudi-spark-bundle_2.11-0.6.0-SNAPSHOT.jar"</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(248, 248, 242)">\</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> --deploy-mode </span><span class="token string" style="color:rgb(255, 121, 198)">"client"</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(248, 248, 242)">\</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> --class </span><span class="token string" style="color:rgb(255, 121, 198)">"org.apache.hudi.utilities.HoodieSnapshotExporter"</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(248, 248, 242)">\</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> packaging/hudi-utilities-bundle/target/hudi-utilities-bundle_2.11-0.6.0-SNAPSHOT.jar </span><span class="token punctuation" style="color:rgb(248, 248, 242)">\</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> --source-base-path </span><span class="token string" style="color:rgb(255, 121, 198)">"/tmp/"</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(248, 248, 242)">\</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> --target-output-path </span><span class="token string" style="color:rgb(255, 121, 198)">"/tmp/exported/json/"</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(248, 248, 242)">\</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> --output-format </span><span class="token string" style="color:rgb(255, 121, 198)">"json"</span><span class="token plain"> </span><span class="token comment" style="color:rgb(98, 114, 164)"># or "parquet"</span><br></span></code></pre><button type="button" aria-label="Copy code to clipboard" class="copyButton_M3SB clean-btn">Copy</button></div></div><h3 class="anchor anchorWithStickyNavbar_y2LR" id="re-partitioning">Re-partitioning<a class="hash-link" href="#re-partitioning" title="Direct link to heading"></a></h3><p>When exporting to a different format, the Exporter takes the <code>--output-partition-field</code> parameter to do some custom re-partitioning. |
| Note: All <code>_hoodie_*</code> metadata fields will be stripped during export, so make sure to use an existing non-metadata field as the output partitions.</p><p>By default, if no partitioning parameters are given, the output dataset will have no partition.</p><p>Example:</p><div class="codeBlockContainer_J+bg language-bash theme-code-block"><div class="codeBlockContent_csEI bash"><pre tabindex="0" class="prism-code language-bash codeBlock_rtdJ thin-scrollbar" style="color:#F8F8F2;background-color:#282A36"><code class="codeBlockLines_1zSZ"><span class="token-line" style="color:#F8F8F2"><span class="token plain">spark-submit </span><span class="token punctuation" style="color:rgb(248, 248, 242)">\</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> --jars </span><span class="token string" style="color:rgb(255, 121, 198)">"packaging/hudi-spark-bundle/target/hudi-spark-bundle_2.11-0.6.0-SNAPSHOT.jar"</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(248, 248, 242)">\</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> --deploy-mode </span><span class="token string" style="color:rgb(255, 121, 198)">"client"</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(248, 248, 242)">\</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> --class </span><span class="token string" style="color:rgb(255, 121, 198)">"org.apache.hudi.utilities.HoodieSnapshotExporter"</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(248, 248, 242)">\</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> packaging/hudi-utilities-bundle/target/hudi-utilities-bundle_2.11-0.6.0-SNAPSHOT.jar </span><span class="token punctuation" style="color:rgb(248, 248, 242)">\</span><span class="token plain"> </span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> --source-base-path </span><span class="token string" style="color:rgb(255, 121, 198)">"/tmp/"</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(248, 248, 242)">\</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> --target-output-path </span><span class="token string" style="color:rgb(255, 121, 198)">"/tmp/exported/json/"</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(248, 248, 242)">\</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> --output-format </span><span class="token string" style="color:rgb(255, 121, 198)">"json"</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(248, 248, 242)">\</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> --output-partition-field </span><span class="token string" style="color:rgb(255, 121, 198)">"symbol"</span><span class="token plain"> </span><span class="token comment" style="color:rgb(98, 114, 164)"># assume the source dataset contains a field `symbol`</span><br></span></code></pre><button type="button" aria-label="Copy code to clipboard" class="copyButton_M3SB clean-btn">Copy</button></div></div><p>The output directory will look like this</p><div class="codeBlockContainer_J+bg language-bash theme-code-block"><div class="codeBlockContent_csEI bash"><pre tabindex="0" class="prism-code language-bash codeBlock_rtdJ thin-scrollbar" style="color:#F8F8F2;background-color:#282A36"><code class="codeBlockLines_1zSZ"><span class="token-line" style="color:#F8F8F2"><span class="token variable" style="color:rgb(189, 147, 249);font-style:italic">`</span><span class="token variable" style="color:rgb(189, 147, 249);font-style:italic">_SUCCESS </span><span class="token variable assign-left variable" style="color:rgb(189, 147, 249);font-style:italic">symbol</span><span class="token variable operator" style="color:rgb(189, 147, 249);font-style:italic">=</span><span class="token variable" style="color:rgb(189, 147, 249);font-style:italic">AMRS </span><span class="token variable assign-left variable" style="color:rgb(189, 147, 249);font-style:italic">symbol</span><span class="token variable operator" style="color:rgb(189, 147, 249);font-style:italic">=</span><span class="token variable" style="color:rgb(189, 147, 249);font-style:italic">AYX </span><span class="token variable assign-left variable" style="color:rgb(189, 147, 249);font-style:italic">symbol</span><span class="token variable operator" style="color:rgb(189, 147, 249);font-style:italic">=</span><span class="token variable" style="color:rgb(189, 147, 249);font-style:italic">CDMO </span><span class="token variable assign-left variable" style="color:rgb(189, 147, 249);font-style:italic">symbol</span><span class="token variable operator" style="color:rgb(189, 147, 249);font-style:italic">=</span><span class="token variable" style="color:rgb(189, 147, 249);font-style:italic">CRC </span><span class="token variable assign-left variable" style="color:rgb(189, 147, 249);font-style:italic">symbol</span><span class="token variable operator" style="color:rgb(189, 147, 249);font-style:italic">=</span><span class="token variable" style="color:rgb(189, 147, 249);font-style:italic">DRNA </span><span class="token variable punctuation" style="color:rgb(248, 248, 242);font-style:italic">..</span><span class="token variable" style="color:rgb(189, 147, 249);font-style:italic">.</span><span class="token variable" style="color:rgb(189, 147, 249);font-style:italic">`</span><br></span></code></pre><button type="button" aria-label="Copy code to clipboard" class="copyButton_M3SB clean-btn">Copy</button></div></div><h3 class="anchor anchorWithStickyNavbar_y2LR" id="custom-re-partitioning">Custom Re-partitioning<a class="hash-link" href="#custom-re-partitioning" title="Direct link to heading"></a></h3><p><code>--output-partitioner</code> parameter takes in a fully-qualified name of a class that implements <code>HoodieSnapshotExporter.Partitioner</code>. |
| This parameter takes higher precedence than <code>--output-partition-field</code>, which will be ignored if this is provided.</p><p>An example implementation is shown below:</p><p><strong>MyPartitioner.java</strong></p><div class="codeBlockContainer_J+bg language-java theme-code-block"><div class="codeBlockContent_csEI java"><pre tabindex="0" class="prism-code language-java codeBlock_rtdJ thin-scrollbar" style="color:#F8F8F2;background-color:#282A36"><code class="codeBlockLines_1zSZ"><span class="token-line" style="color:#F8F8F2"><span class="token plain">package com.foo.bar;</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">public class MyPartitioner implements HoodieSnapshotExporter.Partitioner {</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> private static final String PARTITION_NAME = "date";</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> @Override</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> public DataFrameWriter<Row> partition(Dataset<Row> source) {</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> // use the current hoodie partition path as the output partition</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> return source</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> .withColumnRenamed(HoodieRecord.PARTITION_PATH_METADATA_FIELD, PARTITION_NAME)</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> .repartition(new Column(PARTITION_NAME))</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> .write()</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> .partitionBy(PARTITION_NAME);</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> }</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">}</span><br></span></code></pre><button type="button" aria-label="Copy code to clipboard" class="copyButton_M3SB clean-btn">Copy</button></div></div><p>After putting this class in <code>my-custom.jar</code>, which is then placed on the job classpath, the submit command will look like this:</p><div class="codeBlockContainer_J+bg language-bash theme-code-block"><div class="codeBlockContent_csEI bash"><pre tabindex="0" class="prism-code language-bash codeBlock_rtdJ thin-scrollbar" style="color:#F8F8F2;background-color:#282A36"><code class="codeBlockLines_1zSZ"><span class="token-line" style="color:#F8F8F2"><span class="token plain">spark-submit </span><span class="token punctuation" style="color:rgb(248, 248, 242)">\</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> --jars </span><span class="token string" style="color:rgb(255, 121, 198)">"packaging/hudi-spark-bundle/target/hudi-spark-bundle_2.11-0.6.0-SNAPSHOT.jar,my-custom.jar"</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(248, 248, 242)">\</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> --deploy-mode </span><span class="token string" style="color:rgb(255, 121, 198)">"client"</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(248, 248, 242)">\</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> --class </span><span class="token string" style="color:rgb(255, 121, 198)">"org.apache.hudi.utilities.HoodieSnapshotExporter"</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(248, 248, 242)">\</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> packaging/hudi-utilities-bundle/target/hudi-utilities-bundle_2.11-0.6.0-SNAPSHOT.jar </span><span class="token punctuation" style="color:rgb(248, 248, 242)">\</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> --source-base-path </span><span class="token string" style="color:rgb(255, 121, 198)">"/tmp/"</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(248, 248, 242)">\</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> --target-output-path </span><span class="token string" style="color:rgb(255, 121, 198)">"/tmp/exported/json/"</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(248, 248, 242)">\</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> --output-format </span><span class="token string" style="color:rgb(255, 121, 198)">"json"</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(248, 248, 242)">\</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> --output-partitioner </span><span class="token string" style="color:rgb(255, 121, 198)">"com.foo.bar.MyPartitioner"</span><br></span></code></pre><button type="button" aria-label="Copy code to clipboard" class="copyButton_M3SB clean-btn">Copy</button></div></div></div><footer class="theme-doc-footer docusaurus-mt-lg"><div class="theme-doc-footer-edit-meta-row row"><div class="col"><a 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