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href="/cn/docs/0.11.1/query_engine_setup">Guides</a></div></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-1 menu__list-item"><a class="menu__link" href="/cn/docs/0.11.1/use_cases">Use Cases</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-1 menu__list-item"><a class="menu__link" href="/cn/docs/0.11.1/faq">FAQs</a></li><li class="theme-doc-sidebar-item-link theme-doc-sidebar-item-link-level-1 menu__list-item"><a class="menu__link" href="/cn/docs/0.11.1/privacy">Privacy Policy</a></li></ul></nav></div></aside><main class="docMainContainer_Q970"><div class="container padding-top--md 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>0.11.1</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, which is no longer actively maintained.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/concurrency_control">latest version</a></b> (<!-- -->0.14.1<!-- -->).</div></div><div class="docItemContainer_oiyr"><article><span class="theme-doc-version-badge badge badge--secondary">Version: <!-- -->0.11.1</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>Concurrency Control</h1></header><p>In this section, we will cover Hudi's concurrency model and describe ways to ingest data into a Hudi Table from multiple writers; using the <a href="#deltastreamer">DeltaStreamer</a> tool as well as |
| using the <a href="#datasource-writer">Hudi datasource</a>.</p><h2 class="anchor anchorWithStickyNavbar_y2LR" id="supported-concurrency-controls">Supported Concurrency Controls<a class="hash-link" href="#supported-concurrency-controls" title="Direct link to heading"></a></h2><ul><li><p><strong>MVCC</strong> : Hudi table services such as compaction, cleaning, clustering leverage Multi Version Concurrency Control to provide snapshot isolation |
| between multiple table service writers and readers. Additionally, using MVCC, Hudi provides snapshot isolation between an ingestion writer and multiple concurrent readers. |
| With this model, Hudi supports running any number of table service jobs concurrently, without any concurrency conflict. |
| This is made possible by ensuring that scheduling plans of such table services always happens in a single writer mode to ensure no conflict and avoids race conditions.</p></li><li><p><strong>[NEW]<!-- --> OPTIMISTIC CONCURRENCY</strong> : Write operations such as the ones described above (UPSERT, INSERT) etc, leverage optimistic concurrency control to enable multiple ingestion writers to |
| the same Hudi Table. Hudi supports <code>file level OCC</code>, i.e., for any 2 commits (or writers) happening to the same table, if they do not have writes to overlapping files being changed, both writers are allowed to succeed. |
| This feature is currently <em>experimental</em> and requires either Zookeeper or HiveMetastore to acquire locks.</p></li></ul><p>It may be helpful to understand the different guarantees provided by <a href="/cn/docs/write_operations/">write operations</a> via Hudi datasource or the delta streamer.</p><h2 class="anchor anchorWithStickyNavbar_y2LR" id="single-writer-guarantees">Single Writer Guarantees<a class="hash-link" href="#single-writer-guarantees" title="Direct link to heading"></a></h2><ul><li><em>UPSERT Guarantee</em>: The target table will NEVER show duplicates.</li><li><em>INSERT Guarantee</em>: The target table wilL NEVER have duplicates if <a href="/cn/docs/configurations#hoodiedatasourcewriteinsertdropduplicates">dedup</a> is enabled.</li><li><em>BULK_INSERT Guarantee</em>: The target table will NEVER have duplicates if <a href="/cn/docs/configurations#hoodiedatasourcewriteinsertdropduplicates">dedup</a> is enabled.</li><li><em>INCREMENTAL PULL Guarantee</em>: Data consumption and checkpoints are NEVER out of order.</li></ul><h2 class="anchor anchorWithStickyNavbar_y2LR" id="multi-writer-guarantees">Multi Writer Guarantees<a class="hash-link" href="#multi-writer-guarantees" title="Direct link to heading"></a></h2><p>With multiple writers using OCC, some of the above guarantees change as follows</p><ul><li><em>UPSERT Guarantee</em>: The target table will NEVER show duplicates.</li><li><em>INSERT Guarantee</em>: The target table MIGHT have duplicates even if <a href="/cn/docs/configurations#hoodiedatasourcewriteinsertdropduplicates">dedup</a> is enabled.</li><li><em>BULK_INSERT Guarantee</em>: The target table MIGHT have duplicates even if <a href="/cn/docs/configurations#hoodiedatasourcewriteinsertdropduplicates">dedup</a> is enabled.</li><li><em>INCREMENTAL PULL Guarantee</em>: Data consumption and checkpoints MIGHT be out of order due to multiple writer jobs finishing at different times.</li></ul><h2 class="anchor anchorWithStickyNavbar_y2LR" id="enabling-multi-writing">Enabling Multi Writing<a class="hash-link" href="#enabling-multi-writing" title="Direct link to heading"></a></h2><p>The following properties are needed to be set properly to turn on optimistic concurrency control.</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">hoodie.write.concurrency.mode=optimistic_concurrency_control</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">hoodie.cleaner.policy.failed.writes=LAZY</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">hoodie.write.lock.provider=<lock-provider-classname></span><br></span></code></pre><button type="button" aria-label="Copy code to clipboard" class="copyButton_M3SB clean-btn">Copy</button></div></div><p>There are 3 different server based lock providers that require different configuration to be set.</p><p><strong><code>Zookeeper</code></strong> based lock provider</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">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</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">hoodie.write.lock.zookeeper.port</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">hoodie.write.lock.zookeeper.lock_key</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">hoodie.write.lock.zookeeper.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><p><strong><code>HiveMetastore</code></strong> based lock provider</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">hoodie.write.lock.provider=org.apache.hudi.hive.HiveMetastoreBasedLockProvider</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">hoodie.write.lock.hivemetastore.database</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">hoodie.write.lock.hivemetastore.table</span><br></span></code></pre><button type="button" aria-label="Copy code to clipboard" class="copyButton_M3SB clean-btn">Copy</button></div></div><p><code>The HiveMetastore URI's are picked up from the hadoop configuration file loaded during runtime.</code></p><p><strong><code>Amazon DynamoDB</code></strong> based lock provider</p><p>Amazon DynamoDB based lock provides a simple way to support multi writing across different clusters. You can refer to the |
| <a href="https://hudi.apache.org/docs/configurations#DynamoDB-based-Locks-Configurations" target="_blank" rel="noopener noreferrer">DynamoDB based Locks Configurations</a> |
| section for the details of each related configuration knob.</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">hoodie.write.lock.provider=org.apache.hudi.aws.transaction.lock.DynamoDBBasedLockProvider</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">hoodie.write.lock.dynamodb.table (required)</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">hoodie.write.lock.dynamodb.partition_key (optional)</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">hoodie.write.lock.dynamodb.region (optional)</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">hoodie.write.lock.dynamodb.endpoint_url (optional)</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">hoodie.write.lock.dynamodb.billing_mode (optional)</span><br></span></code></pre><button type="button" aria-label="Copy code to clipboard" class="copyButton_M3SB clean-btn">Copy</button></div></div><p>When using the DynamoDB-based lock provider, the name of the DynamoDB table acting as the lock table for Hudi is |
| specified by the config <code>hoodie.write.lock.dynamodb.table</code>. This DynamoDB table is automatically created by Hudi, so you |
| don't have to create the table yourself. If you want to use an existing DynamoDB table, make sure that an attribute with |
| the name <code>key</code> is present in the table. The <code>key</code> attribute should be the partition key of the DynamoDB table. The |
| config <code>hoodie.write.lock.dynamodb.partition_key</code> specifies the value to put for the <code>key</code> attribute (not the attribute |
| name), which is used for the lock on the same table. By default, <code>hoodie.write.lock.dynamodb.partition_key</code> is set to |
| the table name, so that multiple writers writing to the same table share the same lock. If you customize the name, make |
| sure it's the same across multiple writers.</p><p>Also, to set up the credentials for accessing AWS resources, customers can pass the following props to Hudi jobs:</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">hoodie.aws.access.key</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">hoodie.aws.secret.key</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">hoodie.aws.session.token</span><br></span></code></pre><button type="button" aria-label="Copy code to clipboard" class="copyButton_M3SB clean-btn">Copy</button></div></div><p>If not configured, Hudi falls back to use <a href="https://docs.aws.amazon.com/AWSJavaSDK/latest/javadoc/com/amazonaws/auth/DefaultAWSCredentialsProviderChain.html" target="_blank" rel="noopener noreferrer">DefaultAWSCredentialsProviderChain</a>.</p><p>IAM policy for your service instance will need to add the following permissions:</p><div class="codeBlockContainer_J+bg language-json theme-code-block"><div class="codeBlockContent_csEI json"><pre tabindex="0" class="prism-code language-json codeBlock_rtdJ thin-scrollbar" style="color:#F8F8F2;background-color:#282A36"><code class="codeBlockLines_1zSZ"><span class="token-line" style="color:#F8F8F2"><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"> </span><span class="token property">"Sid"</span><span class="token operator">:</span><span class="token string" style="color:rgb(255, 121, 198)">"DynamoDBLocksTable"</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"> </span><span class="token property">"Effect"</span><span class="token operator">:</span><span class="token plain"> </span><span class="token string" style="color:rgb(255, 121, 198)">"Allow"</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"> </span><span class="token property">"Action"</span><span class="token operator">:</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"> </span><span class="token string" style="color:rgb(255, 121, 198)">"dynamodb:CreateTable"</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"> </span><span class="token string" style="color:rgb(255, 121, 198)">"dynamodb:DeleteItem"</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"> </span><span class="token string" style="color:rgb(255, 121, 198)">"dynamodb:DescribeTable"</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"> </span><span class="token string" style="color:rgb(255, 121, 198)">"dynamodb:GetItem"</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"> </span><span class="token string" style="color:rgb(255, 121, 198)">"dynamodb:PutItem"</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"> </span><span class="token string" style="color:rgb(255, 121, 198)">"dynamodb:Scan"</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"> </span><span class="token string" style="color:rgb(255, 121, 198)">"dynamodb:UpdateItem"</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(248, 248, 242)">]</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"> </span><span class="token property">"Resource"</span><span class="token operator">:</span><span class="token plain"> </span><span class="token string" style="color:rgb(255, 121, 198)">"arn:${Partition}:dynamodb:${Region}:${Account}:table/${TableName}"</span><span class="token plain"></span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"></span><span class="token punctuation" style="color:rgb(248, 248, 242)">}</span><br></span></code></pre><button type="button" aria-label="Copy code to clipboard" class="copyButton_M3SB clean-btn">Copy</button></div></div><ul><li><code>TableName</code> : same as <code>hoodie.write.lock.dynamodb.partition_key</code></li><li><code>Region</code>: same as <code>hoodie.write.lock.dynamodb.region</code></li></ul><p>AWS SDK dependencies are not bundled with Hudi from v0.10.x and will need to be added to your classpath. |
| Add the following Maven packages (check the latest versions at time of install):</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">com.amazonaws:dynamodb-lock-client</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">com.amazonaws:aws-java-sdk-dynamodb</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">com.amazonaws:aws-java-sdk-core</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="datasource-writer">Datasource Writer<a class="hash-link" href="#datasource-writer" title="Direct link to heading"></a></h2><p>The <code>hudi-spark</code> module offers the DataSource API to write (and read) a Spark DataFrame into a Hudi table.</p><p>Following is an example of how to use optimistic_concurrency_control via spark datasource</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">inputDF.write.format("hudi")</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> .options(getQuickstartWriteConfigs)</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> .option(PRECOMBINE_FIELD_OPT_KEY, "ts")</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> .option("hoodie.cleaner.policy.failed.writes", "LAZY")</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> .option("hoodie.write.concurrency.mode", "optimistic_concurrency_control")</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> .option("hoodie.write.lock.zookeeper.url", "zookeeper")</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> .option("hoodie.write.lock.zookeeper.port", "2181")</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> .option("hoodie.write.lock.zookeeper.lock_key", "test_table")</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> .option("hoodie.write.lock.zookeeper.base_path", "/test")</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> .option(RECORDKEY_FIELD_OPT_KEY, "uuid")</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> .option(PARTITIONPATH_FIELD_OPT_KEY, "partitionpath")</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> .option(TABLE_NAME, tableName)</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> .mode(Overwrite)</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> .save(basePath)</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="deltastreamer">DeltaStreamer<a class="hash-link" href="#deltastreamer" title="Direct link to heading"></a></h2><p>The <code>HoodieDeltaStreamer</code> utility (part of hudi-utilities-bundle) provides ways to ingest from different sources such as DFS or Kafka, with the following capabilities.</p><p>Using optimistic_concurrency_control via delta streamer requires adding the above configs to the properties file that can be passed to the |
| job. For example below, adding the configs to kafka-source.properties file and passing them to deltastreamer will enable optimistic concurrency. |
| A deltastreamer job can then be triggered as follows:</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">[hoodie]$ spark-submit --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"> --props file://${PWD}/hudi-utilities/src/test/resources/delta-streamer-config/kafka-source.properties \</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> --schemaprovider-class org.apache.hudi.utilities.schema.SchemaRegistryProvider \</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> --source-class org.apache.hudi.utilities.sources.AvroKafkaSource \</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> --source-ordering-field impresssiontime \</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> --target-base-path file:\/\/\/tmp/hudi-deltastreamer-op \ </span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> --target-table uber.impressions \</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain"> --op BULK_INSERT</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="best-practices-when-using-optimistic-concurrency-control">Best Practices when using Optimistic Concurrency Control<a class="hash-link" href="#best-practices-when-using-optimistic-concurrency-control" title="Direct link to heading"></a></h2><p>Concurrent Writing to Hudi tables requires acquiring a lock with either Zookeeper or HiveMetastore. Due to several reasons you might want to configure retries to allow your application to acquire the lock. </p><ol><li>Network connectivity or excessive load on servers increasing time for lock acquisition resulting in timeouts</li><li>Running a large number of concurrent jobs that are writing to the same hudi table can result in contention during lock acquisition can cause timeouts</li><li>In some scenarios of conflict resolution, Hudi commit operations might take upto 10's of seconds while the lock is being held. This can result in timeouts for other jobs waiting to acquire a lock.</li></ol><p>Set the correct native lock provider client retries. NOTE that sometimes these settings are set on the server once and all clients inherit the same configs. Please check your settings before enabling optimistic concurrency.</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">hoodie.write.lock.wait_time_ms</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">hoodie.write.lock.num_retries</span><br></span></code></pre><button type="button" aria-label="Copy code to clipboard" class="copyButton_M3SB clean-btn">Copy</button></div></div><p>Set the correct hudi client retries for Zookeeper & HiveMetastore. This is useful in cases when native client retry settings cannot be changed. Please note that these retries will happen in addition to any native client retries that you may have set. </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">hoodie.write.lock.client.wait_time_ms</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">hoodie.write.lock.client.num_retries</span><br></span></code></pre><button type="button" aria-label="Copy code to clipboard" class="copyButton_M3SB clean-btn">Copy</button></div></div><p><em>Setting the right values for these depends on a case by case basis; some defaults have been provided for general cases.</em></p><h2 class="anchor anchorWithStickyNavbar_y2LR" id="disabling-multi-writing">Disabling Multi Writing<a class="hash-link" href="#disabling-multi-writing" title="Direct link to heading"></a></h2><p>Remove the following settings that were used to enable multi-writer or override with default values.</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">hoodie.write.concurrency.mode=single_writer</span><br></span><span class="token-line" style="color:#F8F8F2"><span class="token plain">hoodie.cleaner.policy.failed.writes=EAGER</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>If you are using the <code>WriteClient</code> API, please note that multiple writes to the table need to be initiated from 2 different instances of the write client. |
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class="pagination-nav__sublabel">Previous</div><div class="pagination-nav__label">Key Generation</div></a></div><div class="pagination-nav__item pagination-nav__item--next"><a class="pagination-nav__link" href="/cn/docs/0.11.1/table_management"><div class="pagination-nav__sublabel">Next</div><div class="pagination-nav__label">SQL DDL</div></a></div></nav></div></div><div class="col col--3"><div class="tableOfContents_vrFS thin-scrollbar theme-doc-toc-desktop"><ul class="table-of-contents table-of-contents__left-border"><li><a href="#supported-concurrency-controls" class="table-of-contents__link toc-highlight">Supported Concurrency Controls</a></li><li><a href="#single-writer-guarantees" class="table-of-contents__link toc-highlight">Single Writer Guarantees</a></li><li><a href="#multi-writer-guarantees" class="table-of-contents__link toc-highlight">Multi Writer Guarantees</a></li><li><a href="#enabling-multi-writing" class="table-of-contents__link toc-highlight">Enabling Multi 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