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docItemCol_zHA2"><div class="theme-doc-version-banner alert alert--warning margin-bottom--md" role="alert"><div>This is documentation for <!-- -->Apache Hudi<!-- --> <b>0.12.1</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, which is no longer actively maintained.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/metadata_indexing">latest version</a></b> (<!-- -->0.14.1<!-- -->).</div></div><div class="docItemContainer_oiyr"><article><span class="theme-doc-version-badge badge badge--secondary">Version: <!-- -->0.12.1</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>Metadata Indexing</h1></header><p>We can now create different metadata indexes, including files, bloom filters and column stats, |
| asynchronously in Hudi, which are then used by queries and writing to improve performance. |
| Being able to index without blocking writing has two benefits,</p><ul><li>improved write latency</li><li>reduced resource wastage due to contention between writing and indexing.</li></ul><p>To learn more about the design of this feature, please check out <a href="https://github.com/apache/hudi/blob/master/rfc/rfc-45/rfc-45.md" target="_blank" rel="noopener noreferrer">RFC-45</a>.</p><h2 class="anchor anchorWithStickyNavbar_y2LR" id="setup-async-indexing">Setup Async Indexing<a class="hash-link" href="#setup-async-indexing" title="Direct link to heading"></a></h2><p>First, we will generate a continuous workload. In the below example, we are going to start a <a href="/cn/docs/0.12.1/hoodie_deltastreamer#deltastreamer">deltastreamer</a> which will continuously write data |
| from raw parquet to Hudi table. We used the widely available <a href="https://registry.opendata.aws/nyc-tlc-trip-records-pds/" target="_blank" rel="noopener noreferrer">NY Taxi dataset</a>, whose setup details are as below:</p><details class="details_Q743 alert alert--info details_h+cY" data-collapsed="true"><summary>Ingestion write config</summary><div><div class="collapsibleContent_K5uX"><p></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">hoodie.datasource.write.recordkey.field</span><span class="token operator">=</span><span class="token plain">VendorID</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">hoodie.datasource.write.partitionpath.field</span><span class="token operator">=</span><span class="token plain">tpep_dropoff_datetime</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">hoodie.datasource.write.precombine.field</span><span class="token operator">=</span><span class="token plain">tpep_dropoff_datetime</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">hoodie.deltastreamer.source.dfs.root</span><span class="token operator">=</span><span class="token plain">/Users/home/path/to/data/parquet_files/</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">hoodie.deltastreamer.schemaprovider.target.schema.file</span><span class="token operator">=</span><span class="token plain">/Users/home/path/to/schema/schema.avsc</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">hoodie.deltastreamer.schemaprovider.source.schema.file</span><span class="token operator">=</span><span class="token plain">/Users/home/path/to/schema/schema.avsc</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">// </span><span class="token builtin class-name" style="color:rgb(189, 147, 249)">set</span><span class="token plain"> lock provider configs</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">hoodie.write.lock.provider</span><span class="token operator">=</span><span class="token plain">org.apache.hudi.client.transaction.lock.ZookeeperBasedLockProvider</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">hoodie.write.lock.zookeeper.url</span><span class="token operator">=</span><span class="token operator"><</span><span class="token plain">zk_url</span><span class="token operator">></span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">hoodie.write.lock.zookeeper.port</span><span class="token operator">=</span><span class="token operator"><</span><span class="token plain">zk_port</span><span class="token operator">></span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">hoodie.write.lock.zookeeper.lock_key</span><span class="token operator">=</span><span class="token operator"><</span><span class="token plain">zk_key</span><span class="token operator">></span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">hoodie.write.lock.zookeeper.base_path</span><span class="token operator">=</span><span class="token operator"><</span><span class="token plain">zk_base_path</span><span class="token operator">></span><br></span></code></pre><button type="button" aria-label="Copy code to clipboard" class="copyButton_M3SB clean-btn">Copy</button></div></div><p></p></div></div></details><details class="details_Q743 alert alert--info details_h+cY" data-collapsed="true"><summary>Run deltastreamer</summary><div><div class="collapsibleContent_K5uX"><p></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">--class org.apache.hudi.utilities.deltastreamer.HoodieDeltaStreamer </span><span class="token variable" style="color:rgb(189, 147, 249);font-style:italic">`</span><span class="token variable function" style="color:rgb(80, 250, 123);font-style:italic">ls</span><span class="token variable" style="color:rgb(189, 147, 249);font-style:italic"> /Users/home/path/to/hudi-utilities-bundle/target/hudi-utilities-bundle_2.11-0.12.1-SNAPSHOT.jar</span><span class="token variable" style="color:rgb(189, 147, 249);font-style:italic">`</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">--props </span><span class="token variable" style="color:rgb(189, 147, 249);font-style:italic">`</span><span class="token variable function" style="color:rgb(80, 250, 123);font-style:italic">ls</span><span class="token variable" style="color:rgb(189, 147, 249);font-style:italic"> /Users/home/path/to/write/config.properties</span><span class="token variable" style="color:rgb(189, 147, 249);font-style:italic">`</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">--source-class org.apache.hudi.utilities.sources.ParquetDFSSource --schemaprovider-class org.apache.hudi.utilities.schema.FilebasedSchemaProvider </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-ordering-field tpep_dropoff_datetime </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">--table-type COPY_ON_WRITE </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-base-path file:///tmp/hudi-ny-taxi/ </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-table ny_hudi_tbl </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">--op UPSERT </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">--continuous </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-limit </span><span class="token number">5000000</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">--min-sync-interval-seconds </span><span class="token number">60</span><br></span></code></pre><button type="button" aria-label="Copy code to clipboard" class="copyButton_M3SB clean-btn">Copy</button></div></div><p></p></div></div></details><p>From version 0.11.0 onwards, Hudi metadata table is enabled by default and the files index will be automatically created. While the deltastreamer is running in continuous mode, let |
| us schedule the indexing for COLUMN_STATS index. First we need to define a properties file for the indexer.</p><div class="admonition admonition-note alert alert--secondary"><div class="admonition-heading"><h5><span class="admonition-icon"><svg xmlns="http://www.w3.org/2000/svg" width="14" height="16" viewBox="0 0 14 16"><path fill-rule="evenodd" d="M6.3 5.69a.942.942 0 0 1-.28-.7c0-.28.09-.52.28-.7.19-.18.42-.28.7-.28.28 0 .52.09.7.28.18.19.28.42.28.7 0 .28-.09.52-.28.7a1 1 0 0 1-.7.3c-.28 0-.52-.11-.7-.3zM8 7.99c-.02-.25-.11-.48-.31-.69-.2-.19-.42-.3-.69-.31H6c-.27.02-.48.13-.69.31-.2.2-.3.44-.31.69h1v3c.02.27.11.5.31.69.2.2.42.31.69.31h1c.27 0 .48-.11.69-.31.2-.19.3-.42.31-.69H8V7.98v.01zM7 2.3c-3.14 0-5.7 2.54-5.7 5.68 0 3.14 2.56 5.7 5.7 5.7s5.7-2.55 5.7-5.7c0-3.15-2.56-5.69-5.7-5.69v.01zM7 .98c3.86 0 7 3.14 7 7s-3.14 7-7 7-7-3.12-7-7 3.14-7 7-7z"></path></svg></span>note</h5></div><div class="admonition-content"><p>Enabling metadata table and configuring a lock provider are the prerequisites for using async indexer.</p></div></div><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"># ensure that both metadata and async indexing is enabled as below two configs</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">hoodie.metadata.enable=true</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">hoodie.metadata.index.async=true</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"># enable column_stats index config</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">hoodie.metadata.index.column.stats.enable=true</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"># set concurrency mode and lock configs as this is a multi-writer scenario</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"># check https://hudi.apache.org/docs/concurrency_control/ for differnt lock provider configs</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">hoodie.write.concurrency.mode=optimistic_concurrency_control</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">hoodie.write.lock.provider=org.apache.hudi.client.transaction.lock.ZookeeperBasedLockProvider</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">hoodie.write.lock.zookeeper.url=<zk_url></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">hoodie.write.lock.zookeeper.port=<zk_port></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">hoodie.write.lock.zookeeper.lock_key=<zk_key></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">hoodie.write.lock.zookeeper.base_path=<zk_base_path></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="schedule-indexing">Schedule indexing<a class="hash-link" href="#schedule-indexing" title="Direct link to heading"></a></h3><p>Now, we can schedule indexing using <code>HoodieIndexer</code> in <code>schedule</code> mode as follows:</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 \</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">--class org.apache.hudi.utilities.HoodieIndexer \</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">/Users/home/path/to/hudi-utilities-bundle/target/hudi-utilities-bundle_2.11-0.12.1-SNAPSHOT.jar \</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">--props /Users/home/path/to/indexer.properties \</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">--mode schedule \</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">--base-path /tmp/hudi-ny-taxi \</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">--table-name ny_hudi_tbl \</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">--index-types COLUMN_STATS \</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">--parallelism 1 \</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">--spark-memory 1g</span><br></span></code></pre><button type="button" aria-label="Copy code to clipboard" class="copyButton_M3SB clean-btn">Copy</button></div></div><p>This will write an <code>indexing.requested</code> instant to the timeline.</p><h3 class="anchor anchorWithStickyNavbar_y2LR" id="execute-indexing">Execute Indexing<a class="hash-link" href="#execute-indexing" title="Direct link to heading"></a></h3><p>To execute indexing, run the indexer in <code>execute</code> mode as below.</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 \</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">--class org.apache.hudi.utilities.HoodieIndexer \</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">/Users/home/path/to/hudi-utilities-bundle/target/hudi-utilities-bundle_2.11-0.12.1-SNAPSHOT.jar \</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">--props /Users/home/path/to/indexer.properties \</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">--mode execute \</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">--base-path /tmp/hudi-ny-taxi \</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">--table-name ny_hudi_tbl \</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">--index-types COLUMN_STATS \</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">--parallelism 1 \</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">--spark-memory 1g</span><br></span></code></pre><button type="button" aria-label="Copy code to clipboard" class="copyButton_M3SB clean-btn">Copy</button></div></div><p>We can also run the indexer in <code>scheduleAndExecute</code> mode to do the above two steps in one shot. Doing it separately gives us better control over when we want to execute.</p><p>Let's look at the data timeline.</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">ls -lrt /tmp/hudi-ny-taxi/.hoodie</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">total 1816</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">-rw-r--r-- 1 sagars wheel 0 Apr 14 19:53 20220414195327683.commit.requested</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">-rw-r--r-- 1 sagars wheel 153423 Apr 14 19:54 20220414195327683.inflight</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">-rw-r--r-- 1 sagars wheel 207061 Apr 14 19:54 20220414195327683.commit</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">-rw-r--r-- 1 sagars wheel 0 Apr 14 19:54 20220414195423420.commit.requested</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">-rw-r--r-- 1 sagars wheel 659 Apr 14 19:54 20220414195437837.indexing.requested</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">-rw-r--r-- 1 sagars wheel 323950 Apr 14 19:54 20220414195423420.inflight</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">-rw-r--r-- 1 sagars wheel 0 Apr 14 19:55 20220414195437837.indexing.inflight</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">-rw-r--r-- 1 sagars wheel 222920 Apr 14 19:55 20220414195423420.commit</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">-rw-r--r-- 1 sagars wheel 734 Apr 14 19:55 hoodie.properties</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">-rw-r--r-- 1 sagars wheel 979 Apr 14 19:55 20220414195437837.indexing</span><br></span></code></pre><button type="button" aria-label="Copy code to clipboard" class="copyButton_M3SB clean-btn">Copy</button></div></div><p>In the data timeline, we can see that indexing was scheduled after one commit completed (<code>20220414195327683.commit</code>) and another was requested |
| (<code>20220414195423420.commit.requested</code>). This would have picked <code>20220414195327683</code> as the base instant. Indexing was inflight with an inflight writer as well. If we parse the |
| indexer logs, we would find that it indeed caught up with instant <code>20220414195423420</code> after indexing upto the base instant.</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">22/04/14 19:55:22 INFO HoodieTableMetaClient: Finished Loading Table of type MERGE_ON_READ(version=1, baseFileFormat=HFILE) from /tmp/hudi-ny-taxi/.hoodie/metadata</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">22/04/14 19:55:22 INFO RunIndexActionExecutor: Starting Index Building with base instant: 20220414195327683</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">22/04/14 19:55:22 INFO HoodieBackedTableMetadataWriter: Creating a new metadata index for partition 'column_stats' under path /tmp/hudi-ny-taxi/.hoodie/metadata upto instant 20220414195327683</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><span class="token-line" style="color:#F8F8F2"><span class="token plain">22/04/14 19:55:38 INFO RunIndexActionExecutor: Total remaining instants to index: 1</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">22/04/14 19:55:38 INFO HoodieTableMetaClient: Loading HoodieTableMetaClient from /tmp/hudi-ny-taxi/.hoodie/metadata</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">22/04/14 19:55:38 INFO HoodieTableConfig: Loading table properties from /tmp/hudi-ny-taxi/.hoodie/metadata/.hoodie/hoodie.properties</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">22/04/14 19:55:38 INFO HoodieTableMetaClient: Finished Loading Table of type MERGE_ON_READ(version=1, baseFileFormat=HFILE) from /tmp/hudi-ny-taxi/.hoodie/metadata</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">22/04/14 19:55:38 INFO HoodieActiveTimeline: Loaded instants upto : Option{val=[20220414195423420__deltacommit__COMPLETED]}</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">22/04/14 19:55:38 INFO RunIndexActionExecutor: Starting index catchup task</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><h3 class="anchor anchorWithStickyNavbar_y2LR" id="drop-index">Drop Index<a class="hash-link" href="#drop-index" title="Direct link to heading"></a></h3><p>To drop an index, just run the index in <code>dropindex</code> mode.</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 \</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">--class org.apache.hudi.utilities.HoodieIndexer \</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">/Users/home/path/to/hudi-utilities-bundle/target/hudi-utilities-bundle_2.11-0.12.1-SNAPSHOT.jar \</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">--props /Users/home/path/to/indexer.properties \</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">--mode dropindex \</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">--base-path /tmp/hudi-ny-taxi \</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">--table-name ny_hudi_tbl \</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">--index-types COLUMN_STATS \</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">--parallelism 1 \</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">--spark-memory 2g</span><br></span></code></pre><button type="button" aria-label="Copy code to clipboard" class="copyButton_M3SB clean-btn">Copy</button></div></div><h2 class="anchor anchorWithStickyNavbar_y2LR" id="caveats">Caveats<a class="hash-link" href="#caveats" title="Direct link to heading"></a></h2><p>Asynchronous indexing feature is still evolving. Few points to note from deployment perspective while running the indexer:</p><ul><li>While an index can be created concurrently with ingestion, it cannot be dropped concurrently. Please stop all writers |
| before dropping an index.</li><li>Files index is created by default as long as the metadata table is enabled.</li><li>Trigger indexing for one metadata partition (or index type) at a time.</li><li>If an index is enabled via async HoodieIndexer, then ensure that index is also enabled in configs corresponding to regular ingestion writers. Otherwise, metadata writer will |
| think that particular index was disabled and cleanup the metadata partition.</li><li>In the case of multi-writers, enable async index and specific index config for all writers.</li><li>Unlike other table services like compaction and clustering, where we have a separate configuration to run inline, there is no such inline config here. |
| For example, if async indexing is disabled and metadata is enabled along with column stats index type, then both files and column stats index will be created synchronously with ingestion.</li></ul><p>Some of these limitations will be removed in the upcoming releases. Please |
| follow <a href="https://issues.apache.org/jira/browse/HUDI-2488" target="_blank" rel="noopener noreferrer">HUDI-2488</a> for developments on this feature.</p></div><footer class="theme-doc-footer docusaurus-mt-lg"><div class="theme-doc-footer-edit-meta-row row"><div class="col"><a href="https://github.com/apache/hudi/tree/asf-site/website/versioned_docs/version-0.12.1/metadata_indexing.md" target="_blank" rel="noreferrer noopener" class="theme-edit-this-page"><svg fill="currentColor" height="20" width="20" viewBox="0 0 40 40" class="iconEdit_mS5F" aria-hidden="true"><g><path d="m34.5 11.7l-3 3.1-6.3-6.3 3.1-3q0.5-0.5 1.2-0.5t1.1 0.5l3.9 3.9q0.5 0.4 0.5 1.1t-0.5 1.2z m-29.5 17.1l18.4-18.5 6.3 6.3-18.4 18.4h-6.3v-6.2z"></path></g></svg>Edit this page</a></div><div class="col lastUpdated_mt2f"></div></div></footer></article><nav class="pagination-nav docusaurus-mt-lg" aria-label="Docs pages navigation"><div class="pagination-nav__item"><a class="pagination-nav__link" 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