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    252. 

  252.                        <h5>MapReduce REST APIs</h5>
    253. 

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    256. 

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    261. 

  261.                        <h5>YARN</h5>
    262. 

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    289. 

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    292. 

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    294. 

  294.                   <a href="../../../hadoop-yarn/hadoop-yarn-site/TimelineServer.html">Timeline Server</a>
    295. 

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    297. 

  297.                   <a href="../../../hadoop-yarn/hadoop-yarn-site/TimelineServiceV2.html">Timeline Service V.2</a>
    298. 

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  300.                   <a href="../../../hadoop-yarn/hadoop-yarn-site/WritingYarnApplications.html">Writing YARN Applications</a>
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    303. 

  303.                   <a href="../../../hadoop-yarn/hadoop-yarn-site/YarnApplicationSecurity.html">YARN Application Security</a>
    304. 

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    305. 

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    306. 

  306.                   <a href="../../../hadoop-yarn/hadoop-yarn-site/NodeManager.html">NodeManager</a>
    307. 

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    308. 

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    309. 

  309.                   <a href="../../../hadoop-yarn/hadoop-yarn-site/DockerContainers.html">Running Applications in Docker Containers</a>
    310. 

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    312. 

  312.                   <a href="../../../hadoop-yarn/hadoop-yarn-site/RuncContainers.html">Running Applications in runC Containers</a>
    313. 

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    314. 

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    315. 

  315.                   <a href="../../../hadoop-yarn/hadoop-yarn-site/NodeManagerCgroups.html">Using CGroups</a>
    316. 

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    525. 

  525. <h1><a name="BulkDelete"></a> interface <code>BulkDelete</code></h1>
    526. 

  526. <ul>
    527. 

  527. <li><a href="#Key_Features">Key Features</a>
    528. 

  528. <ul>
    529. 

  529. <li><a href="#Interface_org.apache.hadoop.fs.BulkDeleteSource">Interface org.apache.hadoop.fs.BulkDeleteSource</a></li>
    530. 

  530. <li><a href="#Interface_org.apache.hadoop.fs.BulkDelete">Interface org.apache.hadoop.fs.BulkDelete</a></li>
    531. 

  531. <li><a href="#bulkDelete.28paths.29">bulkDelete(paths)</a></li>
    532. 

  532. <li><a href="#Availability">Availability</a></li>
    533. 

  533. <li><a href="#Invocation_through_Reflection.">Invocation through Reflection.</a></li>
    534. 

  534. <li><a href="#Implementations">Implementations</a></li></ul></li></ul>
    535. 

  535. 

  536. <p>The <code>BulkDelete</code> interface provides an API to perform bulk delete of files/objects in an object store or filesystem.</p><section>
    537. 

  537. <h2><a name="Key_Features"></a>Key Features</h2>
    538. 

  538. <ul>
    539. 

  539. 

  540. <li>An API for submitting a list of paths to delete.</li>
    541. 

  541. <li>This list must be no larger than the &#x201c;page size&#x201d; supported by the client; This size is also exposed as a method.</li>
    542. 

  542. <li>This list must not have any path outside the base path.</li>
    543. 

  543. <li>Triggers a request to delete files at the specific paths.</li>
    544. 

  544. <li>Returns a list of which paths were reported as delete failures by the store.</li>
    545. 

  545. <li>Does not consider a nonexistent file to be a failure.</li>
    546. 

  546. <li>Does not offer any atomicity guarantees.</li>
    547. 

  547. <li>Idempotency guarantees are weak: retries may delete files newly created by other clients.</li>
    548. 

  548. <li>Provides no guarantees as to the outcome if a path references a directory.</li>
    549. 

  549. <li>Provides no guarantees that parent directories will exist after the call.</li>
    550. 

  550. </ul>
    551. 

  551. <p>The API is designed to match the semantics of the AWS S3 <a class="externalLink" href="https://docs.aws.amazon.com/AmazonS3/latest/API/API_DeleteObjects.html">Bulk Delete</a> REST API call, but it is not exclusively restricted to this store. This is why the &#x201c;provides no guarantees&#x201d; restrictions do not state what the outcome will be when executed on other stores.</p><section>
    552. 

  552. <h3><a name="Interface_org.apache.hadoop.fs.BulkDeleteSource"></a>Interface <code>org.apache.hadoop.fs.BulkDeleteSource</code></h3>
    553. 

  553. <p>The interface <code>BulkDeleteSource</code> is offered by a FileSystem/FileContext class if it supports the API. The default implementation is implemented in base FileSystem class that returns an instance of <code>org.apache.hadoop.fs.impl.DefaultBulkDeleteOperation</code>. The default implementation details are provided in below sections.</p>
    554. 

  554. 

  555. <div class="source">
    556. 

  556. <div class="source">
    557. 

  557. <pre>@InterfaceAudience.Public
    558. 

  558. @InterfaceStability.Unstable
    559. 

  559. public interface BulkDeleteSource {
    560. 

  560.   BulkDelete createBulkDelete(Path path)
    561. 

  561.       throws UnsupportedOperationException, IllegalArgumentException, IOException;
    562. 

  562. 

  563. }
    564. 

  564. 

  565. </pre></div></div>
    566. 

  566. </section><section>
    567. 

  567. <h3><a name="Interface_org.apache.hadoop.fs.BulkDelete"></a>Interface <code>org.apache.hadoop.fs.BulkDelete</code></h3>
    568. 

  568. <p>This is the bulk delete implementation returned by the <code>createBulkDelete()</code> call.</p>
    569. 

  569. 

  570. <div class="source">
    571. 

  571. <div class="source">
    572. 

  572. <pre>@InterfaceAudience.Public
    573. 

  573. @InterfaceStability.Unstable
    574. 

  574. public interface BulkDelete extends IOStatisticsSource, Closeable {
    575. 

  575.   int pageSize();
    576. 

  576.   Path basePath();
    577. 

  577.   List&lt;Map.Entry&lt;Path, String&gt;&gt; bulkDelete(List&lt;Path&gt; paths)
    578. 

  578.       throws IOException, IllegalArgumentException;
    579. 

  579. 

  580. }
    581. 

  581. 

  582. </pre></div></div>
    583. 

  583. </section><section>
    584. 

  584. <h3><a name="bulkDelete.28paths.29"></a><code>bulkDelete(paths)</code></h3><section>
    585. 

  585. <h4><a name="Preconditions"></a>Preconditions</h4>
    586. 

  586. 

  587. <div class="source">
    588. 

  588. <div class="source">
    589. 

  589. <pre>if length(paths) &gt; pageSize: throw IllegalArgumentException
    590. 

  590. </pre></div></div>
    591. 

  591. </section><section>
    592. 

  592. <h4><a name="Postconditions"></a>Postconditions</h4>
    593. 

  593. <p>All paths which refer to files are removed from the set of files.</p>
    594. 

  594. 

  595. <div class="source">
    596. 

  596. <div class="source">
    597. 

  597. <pre>FS'Files = FS.Files - [paths]
    598. 

  598. </pre></div></div>
    599. 

  599. 

  600. <p>No other restrictions are placed upon the outcome.</p></section></section><section>
    601. 

  601. <h3><a name="Availability"></a>Availability</h3>
    602. 

  602. <p>The <code>BulkDeleteSource</code> interface is exported by <code>FileSystem</code> and <code>FileContext</code> storage clients which is available for all FS via <code>org.apache.hadoop.fs.impl.DefaultBulkDeleteSource</code>. For integration in applications like Apache Iceberg to work seamlessly, all implementations of this interface MUST NOT reject the request but instead return a BulkDelete instance of size &gt;= 1.</p>
    603. 

  603. <p>Use the <code>PathCapabilities</code> probe <code>fs.capability.bulk.delete</code>.</p>
    604. 

  604. 

  605. <div class="source">
    606. 

  606. <div class="source">
    607. 

  607. <pre>store.hasPathCapability(path, &quot;fs.capability.bulk.delete&quot;)
    608. 

  608. </pre></div></div>
    609. 

  609. </section><section>
    610. 

  610. <h3><a name="Invocation_through_Reflection."></a>Invocation through Reflection.</h3>
    611. 

  611. <p>The need for many libraries to compile against very old versions of Hadoop means that most of the cloud-first Filesystem API calls cannot be used except through reflection -And the more complicated The API and its data types are, The harder that reflection is to implement.</p>
    612. 

  612. <p>To assist this, the class <code>org.apache.hadoop.io.wrappedio.WrappedIO</code> has few methods which are intended to provide simple access to the API, especially through reflection.</p>
    613. 

  613. 

  614. <div class="source">
    615. 

  615. <div class="source">
    616. 

  616. <pre>  public static int bulkDeletePageSize(FileSystem fs, Path path) throws IOException;
    617. 

  617. 

  618.   public static int bulkDeletePageSize(FileSystem fs, Path path) throws IOException;
    619. 

  619. 

  620.   public static List&lt;Map.Entry&lt;Path, String&gt;&gt; bulkDelete(FileSystem fs, Path base, Collection&lt;Path&gt; paths);
    621. 

  621. </pre></div></div>
    622. 

  622. </section><section>
    623. 

  623. <h3><a name="Implementations"></a>Implementations</h3><section>
    624. 

  624. <h4><a name="Default_Implementation"></a>Default Implementation</h4>
    625. 

  625. <p>The default implementation which will be used by all implementation of <code>FileSystem</code> of the <code>BulkDelete</code> interface is <code>org.apache.hadoop.fs.impl.DefaultBulkDeleteOperation</code> which fixes the page size to be 1 and calls <code>FileSystem.delete(path, false)</code> on the single path in the list.</p></section><section>
    626. 

  626. <h4><a name="S3A_Implementation"></a>S3A Implementation</h4>
    627. 

  627. <p>The S3A implementation is <code>org.apache.hadoop.fs.s3a.impl.BulkDeleteOperation</code> which implements the multi object delete semantics of the AWS S3 API <a class="externalLink" href="https://docs.aws.amazon.com/AmazonS3/latest/API/API_DeleteObjects.html">Bulk Delete</a> For more details please refer to the S3A Performance documentation.</p></section></section></section>
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