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padding-bottom--lg"><div class="row"><div class="col docItemCol_zHA2"><div class="theme-doc-version-banner alert alert--warning margin-bottom--md" role="alert"><div>This is documentation for <!-- -->Apache Hudi<!-- --> <b>0.13.0</b>, which is no longer actively maintained.</div><div class="margin-top--md">For up-to-date documentation, see the <b><a href="/cn/docs/migration_guide">latest version</a></b> (<!-- -->0.14.1<!-- -->).</div></div><div class="docItemContainer_oiyr"><article><span class="theme-doc-version-badge badge badge--secondary">Version: <!-- -->0.13.0</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>Bootstrapping</h1></header><p>Hudi maintains metadata such as commit timeline and indexes to manage a table. The commit timelines helps to understand the actions happening on a table as well as the current state of a table. Indexes are used by Hudi to maintain a record key to file id mapping to efficiently locate a record. At the moment, Hudi supports writing only parquet columnar formats. |
| To be able to start using Hudi for your existing table, you will need to migrate your existing table into a Hudi managed table. There are a couple of ways to achieve this.</p><h2 class="anchor anchorWithStickyNavbar_y2LR" id="approaches">Approaches<a class="hash-link" href="#approaches" title="Direct link to heading"></a></h2><h3 class="anchor anchorWithStickyNavbar_y2LR" id="use-hudi-for-new-partitions-alone">Use Hudi for new partitions alone<a class="hash-link" href="#use-hudi-for-new-partitions-alone" title="Direct link to heading"></a></h3><p>Hudi can be used to manage an existing table without affecting/altering the historical data already present in the |
| table. Hudi has been implemented to be compatible with such a mixed table with a caveat that either the complete |
| Hive partition is Hudi managed or not. Thus the lowest granularity at which Hudi manages a table is a Hive |
| partition. Start using the datasource API or the WriteClient to write to the table and make sure you start writing |
| to a new partition or convert your last N partitions into Hudi instead of the entire table. Note, since the historical |
| partitions are not managed by HUDI, none of the primitives provided by HUDI work on the data in those partitions. More concretely, one cannot perform upserts or incremental pull on such older partitions not managed by the HUDI table. |
| Take this approach if your table is an append only type of table and you do not expect to perform any updates to existing (or non Hudi managed) partitions.</p><h3 class="anchor anchorWithStickyNavbar_y2LR" id="convert-existing-table-to-hudi">Convert existing table to Hudi<a class="hash-link" href="#convert-existing-table-to-hudi" title="Direct link to heading"></a></h3><p>Import your existing table into a Hudi managed table. Since all the data is Hudi managed, none of the limitations |
| of Approach 1 apply here. Updates spanning any partitions can be applied to this table and Hudi will efficiently |
| make the update available to queries. Note that not only do you get to use all Hudi primitives on this table, |
| there are other additional advantages of doing this. Hudi automatically manages file sizes of a Hudi managed table |
| . You can define the desired file size when converting this table and Hudi will ensure it writes out files |
| adhering to the config. It will also ensure that smaller files later get corrected by routing some new inserts into |
| small files rather than writing new small ones thus maintaining the health of your cluster.</p><p>There are a few options when choosing this approach.</p><p><strong>Option 1</strong> |
| Use the HoodieDeltaStreamer tool. HoodieDeltaStreamer supports bootstrap with --run-bootstrap command line option. There are two types of bootstrap, |
| METADATA_ONLY and FULL_RECORD. METADATA_ONLY will generate just skeleton base files with keys/footers, avoiding full cost of rewriting the dataset. |
| FULL_RECORD will perform a full copy/rewrite of the data as a Hudi table.</p><p>Here is an example for running FULL_RECORD bootstrap and keeping hive style partition with HoodieDeltaStreamer.</p><div class="codeBlockContainer_J+bg theme-code-block"><div class="codeBlockContent_csEI"><pre tabindex="0" class="prism-code language-undefined 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 --master local \</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">--conf 'spark.serializer=org.apache.spark.serializer.KryoSerializer' \</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">--class org.apache.hudi.utilities.deltastreamer.HoodieDeltaStreamer `ls packaging/hudi-utilities-bundle/target/hudi-utilities-bundle-*.jar` \</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">--run-bootstrap \</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">--target-base-path /tmp/hoodie/bootstrap_table \</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">--target-table bootstrap_table \</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">--table-type COPY_ON_WRITE \</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">--hoodie-conf hoodie.bootstrap.base.path=/tmp/source_table \</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">--hoodie-conf hoodie.datasource.write.recordkey.field=${KEY_FIELD} \</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">--hoodie-conf hoodie.datasource.write.partitionpath.field=${PARTITION_FIELD} \</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">--hoodie-conf hoodie.datasource.write.precombine.field=${PRECOMBINE_FILED} \</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">--hoodie-conf hoodie.bootstrap.keygen.class=org.apache.hudi.keygen.SimpleKeyGenerator \</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">--hoodie-conf hoodie.bootstrap.full.input.provider=org.apache.hudi.bootstrap.SparkParquetBootstrapDataProvider \</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">--hoodie-conf hoodie.bootstrap.mode.selector=org.apache.hudi.client.bootstrap.selector.BootstrapRegexModeSelector \</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">--hoodie-conf hoodie.bootstrap.mode.selector.regex.mode=FULL_RECORD \</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">--hoodie-conf hoodie.datasource.write.hive_style_partitioning=true</span><br></span></code></pre><button type="button" aria-label="Copy code to clipboard" class="copyButton_M3SB clean-btn">Copy</button></div></div><p><strong>Option 2</strong> |
| For huge tables, this could be as simple as : </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">for partition in [list of partitions in source table] {</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> val inputDF = spark.read.format("any_input_format").load("partition_path")</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> inputDF.write.format("org.apache.hudi").option()....save("basePath")</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><strong>Option 3</strong> |
| Write your own custom logic of how to load an existing table into a Hudi managed one. Please read about the RDD API |
| <a href="/cn/docs/quick-start-guide">here</a>. Using the bootstrap run CLI. Once hudi has been built via <code>mvn clean install -DskipTests</code>, the shell can be |
| fired by via <code>cd hudi-cli && ./hudi-cli.sh</code>.</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">hudi->bootstrap run --srcPath /tmp/source_table --targetPath /tmp/hoodie/bootstrap_table --tableName bootstrap_table --tableType COPY_ON_WRITE --rowKeyField ${KEY_FIELD} --partitionPathField ${PARTITION_FIELD} --sparkMaster local --hoodieConfigs hoodie.datasource.write.hive_style_partitioning=true --selectorClass org.apache.hudi.client.bootstrap.selector.FullRecordBootstrapModeSelector</span><br></span></code></pre><button type="button" aria-label="Copy code to clipboard" class="copyButton_M3SB clean-btn">Copy</button></div></div><p>Unlike deltaStream, FULL_RECORD or METADATA_ONLY is set with --selectorClass, see detalis with help "bootstrap run".</p><p><strong>Option 4</strong> |
| You can load an existing table into a Hudi managed one only through SQL. |
| Here is an example of using the <code>spark-sql</code> script to execute bootstrap through the SQL of <code>call run_bootstrap</code></p><div class="codeBlockContainer_J+bg theme-code-block"><div class="codeBlockContent_csEI"><pre tabindex="0" class="prism-code language-undefined codeBlock_rtdJ thin-scrollbar" style="color:#F8F8F2;background-color:#282A36"><code class="codeBlockLines_1zSZ"><span class="token-line" style="color:#F8F8F2"><span class="token plain">spark-sql> call run_bootstrap(table => 'bootstrap_table',table_type => 'COPY_ON_WRITE',bootstrap_path => '/tmp/source_table',base_path => '/tmp/hoodie/bootstrap_table', rowKey_field => '${KEY_FIELD}',partition_path_field => '${PARTITION_FIELD}',selector_class => 'org.apache.hudi.client.bootstrap.selector.FullRecordBootstrapModeSelector', bootstrap_overwrite => true);</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 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