| <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> |
| <!-- NewPage --> |
| <html lang="en"> |
| <head> |
| <!-- Generated by javadoc (1.8.0_181-google-v7) on Wed Aug 14 17:37:13 PDT 2019 --> |
| <title>DoFn.GetPartition (Apache Beam 2.15.0-SNAPSHOT)</title> |
| <meta name="date" content="2019-08-14"> |
| <link rel="stylesheet" type="text/css" href="../../../../../stylesheet.css" title="Style"> |
| <script type="text/javascript" src="../../../../../script.js"></script> |
| </head> |
| <body> |
| <script type="text/javascript"><!-- |
| try { |
| if (location.href.indexOf('is-external=true') == -1) { |
| parent.document.title="DoFn.GetPartition (Apache Beam 2.15.0-SNAPSHOT)"; |
| } |
| } |
| catch(err) { |
| } |
| //--> |
| </script> |
| <noscript> |
| <div>JavaScript is disabled on your browser.</div> |
| </noscript> |
| <!-- ========= START OF TOP NAVBAR ======= --> |
| <div class="topNav"><a name="navbar.top"> |
| <!-- --> |
| </a> |
| <div class="skipNav"><a href="#skip.navbar.top" title="Skip navigation links">Skip navigation links</a></div> |
| <a name="navbar.top.firstrow"> |
| <!-- --> |
| </a> |
| <ul class="navList" title="Navigation"> |
| <li><a href="../../../../../overview-summary.html">Overview</a></li> |
| <li><a href="package-summary.html">Package</a></li> |
| <li class="navBarCell1Rev">Class</li> |
| <li><a href="package-tree.html">Tree</a></li> |
| <li><a href="../../../../../deprecated-list.html">Deprecated</a></li> |
| <li><a href="../../../../../index-all.html">Index</a></li> |
| <li><a href="../../../../../help-doc.html">Help</a></li> |
| </ul> |
| </div> |
| <div class="subNav"> |
| <ul class="navList"> |
| <li><a href="../../../../../org/apache/beam/sdk/transforms/DoFn.GetInitialRestriction.html" title="annotation in org.apache.beam.sdk.transforms"><span class="typeNameLink">Prev Class</span></a></li> |
| <li><a href="../../../../../org/apache/beam/sdk/transforms/DoFn.GetRestrictionCoder.html" title="annotation in org.apache.beam.sdk.transforms"><span class="typeNameLink">Next Class</span></a></li> |
| </ul> |
| <ul class="navList"> |
| <li><a href="../../../../../index.html?org/apache/beam/sdk/transforms/DoFn.GetPartition.html" target="_top">Frames</a></li> |
| <li><a href="DoFn.GetPartition.html" target="_top">No Frames</a></li> |
| </ul> |
| <ul class="navList" id="allclasses_navbar_top"> |
| <li><a href="../../../../../allclasses-noframe.html">All Classes</a></li> |
| </ul> |
| <div> |
| <script type="text/javascript"><!-- |
| allClassesLink = document.getElementById("allclasses_navbar_top"); |
| if(window==top) { |
| allClassesLink.style.display = "block"; |
| } |
| else { |
| allClassesLink.style.display = "none"; |
| } |
| //--> |
| </script> |
| </div> |
| <div> |
| <ul class="subNavList"> |
| <li>Summary: </li> |
| <li>Field | </li> |
| <li>Required | </li> |
| <li>Optional</li> |
| </ul> |
| <ul class="subNavList"> |
| <li>Detail: </li> |
| <li>Field | </li> |
| <li>Element</li> |
| </ul> |
| </div> |
| <a name="skip.navbar.top"> |
| <!-- --> |
| </a></div> |
| <!-- ========= END OF TOP NAVBAR ========= --> |
| <!-- ======== START OF CLASS DATA ======== --> |
| <div class="header"> |
| <div class="subTitle">org.apache.beam.sdk.transforms</div> |
| <h2 title="Annotation Type DoFn.GetPartition" class="title">Annotation Type DoFn.GetPartition</h2> |
| </div> |
| <div class="contentContainer"> |
| <div class="description"> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <hr> |
| <br> |
| <pre>@Documented |
| @Retention(value=RUNTIME) |
| @Target(value=METHOD) |
| <a href="../../../../../org/apache/beam/sdk/annotations/Experimental.html" title="annotation in org.apache.beam.sdk.annotations">@Experimental</a>(<a href="../../../../../org/apache/beam/sdk/annotations/Experimental.html#value--">value</a>=<a href="../../../../../org/apache/beam/sdk/annotations/Experimental.Kind.html#SPLITTABLE_DO_FN">SPLITTABLE_DO_FN</a>) |
| public static @interface <span class="memberNameLabel">DoFn.GetPartition</span></pre> |
| <div class="block">Annotation for the method that returns the corresponding partition identifier for an element |
| and restriction pair. |
| |
| <p>Signature: <code>byte[] getPartitition(InputT element, RestrictionT restriction);</code> |
| |
| <p>Returns an immutable representation of the partition identifier as a byte[]. |
| |
| <p>By default, the partition identifier is represented as the encoded element and restriction |
| pair and should only be provided if the splittable <a href="../../../../../org/apache/beam/sdk/transforms/DoFn.html" title="class in org.apache.beam.sdk.transforms"><code>DoFn</code></a> can only provide a size over a |
| shared resource such as a message queue that potentially multiple element and restriction pairs |
| are doing work on. The partition identifier is used by runners for various size calculations. |
| Sizes reported with the same partition identifier represent a point in time reporting of the |
| size for that partition. For example, a runner can compute a global size by summing all |
| reported sizes over all unique partition identifiers while it can compute the size of a |
| specific partition based upon the last reported value. |
| |
| <p>For example splittable <a href="../../../../../org/apache/beam/sdk/transforms/DoFn.html" title="class in org.apache.beam.sdk.transforms"><code>DoFn</code></a>s which consume elements from: |
| |
| <ul> |
| <li>a globally shared resource such as a Pubsub queue should set this to "". |
| <li>a shared partitioned resource should use the partition identifier. |
| <li>a uniquely partitioned resource such as a file and offset range should not override this |
| since the default element and restriction pair should suffice. |
| </ul></div> |
| </li> |
| </ul> |
| </div> |
| </div> |
| <!-- ========= END OF CLASS DATA ========= --> |
| <!-- ======= START OF BOTTOM NAVBAR ====== --> |
| <div class="bottomNav"><a name="navbar.bottom"> |
| <!-- --> |
| </a> |
| <div class="skipNav"><a href="#skip.navbar.bottom" title="Skip navigation links">Skip navigation links</a></div> |
| <a name="navbar.bottom.firstrow"> |
| <!-- --> |
| </a> |
| <ul class="navList" title="Navigation"> |
| <li><a href="../../../../../overview-summary.html">Overview</a></li> |
| <li><a href="package-summary.html">Package</a></li> |
| <li class="navBarCell1Rev">Class</li> |
| <li><a href="package-tree.html">Tree</a></li> |
| <li><a href="../../../../../deprecated-list.html">Deprecated</a></li> |
| <li><a href="../../../../../index-all.html">Index</a></li> |
| <li><a href="../../../../../help-doc.html">Help</a></li> |
| </ul> |
| </div> |
| <div class="subNav"> |
| <ul class="navList"> |
| <li><a href="../../../../../org/apache/beam/sdk/transforms/DoFn.GetInitialRestriction.html" title="annotation in org.apache.beam.sdk.transforms"><span class="typeNameLink">Prev Class</span></a></li> |
| <li><a href="../../../../../org/apache/beam/sdk/transforms/DoFn.GetRestrictionCoder.html" title="annotation in org.apache.beam.sdk.transforms"><span class="typeNameLink">Next Class</span></a></li> |
| </ul> |
| <ul class="navList"> |
| <li><a href="../../../../../index.html?org/apache/beam/sdk/transforms/DoFn.GetPartition.html" target="_top">Frames</a></li> |
| <li><a href="DoFn.GetPartition.html" target="_top">No Frames</a></li> |
| </ul> |
| <ul class="navList" id="allclasses_navbar_bottom"> |
| <li><a href="../../../../../allclasses-noframe.html">All Classes</a></li> |
| </ul> |
| <div> |
| <script type="text/javascript"><!-- |
| allClassesLink = document.getElementById("allclasses_navbar_bottom"); |
| if(window==top) { |
| allClassesLink.style.display = "block"; |
| } |
| else { |
| allClassesLink.style.display = "none"; |
| } |
| //--> |
| </script> |
| </div> |
| <div> |
| <ul class="subNavList"> |
| <li>Summary: </li> |
| <li>Field | </li> |
| <li>Required | </li> |
| <li>Optional</li> |
| </ul> |
| <ul class="subNavList"> |
| <li>Detail: </li> |
| <li>Field | </li> |
| <li>Element</li> |
| </ul> |
| </div> |
| <a name="skip.navbar.bottom"> |
| <!-- --> |
| </a></div> |
| <!-- ======== END OF BOTTOM NAVBAR ======= --> |
| </body> |
| </html> |
