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| <div class="subTitle"><span class="packageLabelInType">Package</span> <a href="package-summary.html">org.apache.iceberg.flink.source.assigner</a></div> |
| <h2 title="Interface SplitAssigner" class="title">Interface SplitAssigner</h2> |
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| <dt>All Superinterfaces:</dt> |
| <dd><code>java.lang.AutoCloseable</code>, <code>java.io.Closeable</code></dd> |
| </dl> |
| <dl> |
| <dt>All Known Implementing Classes:</dt> |
| <dd><code><a href="SimpleSplitAssigner.html" title="class in org.apache.iceberg.flink.source.assigner">SimpleSplitAssigner</a></code></dd> |
| </dl> |
| <hr> |
| <pre>public interface <span class="typeNameLabel">SplitAssigner</span> |
| extends java.io.Closeable</pre> |
| <div class="block">SplitAssigner interface is extracted out as a separate component so that we can plug in different |
| split assignment strategy for different requirements. E.g. |
| |
| <ul> |
| <li>Simple assigner with no ordering guarantee or locality aware optimization. |
| <li>Locality aware assigner that prefer splits that are local. |
| <li>Snapshot aware assigner that assign splits based on the order they are committed. |
| <li>Event time alignment assigner that assign splits satisfying certain time ordering within a |
| single source or across sources. |
| </ul> |
| |
| <p>Assigner implementation needs to be thread safe. Enumerator call the assigner APIs mostly from |
| the coordinator thread. But enumerator may call the <a href="#pendingSplitCount()"><code>pendingSplitCount()</code></a> |
| from the I/O threads.</div> |
| </li> |
| </ul> |
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| <!-- ========== METHOD SUMMARY =========== --> |
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| <h3>Method Summary</h3> |
| <table class="memberSummary"> |
| <caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd"> </span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd"> </span></span><span id="t3" class="tableTab"><span><a href="javascript:show(4);">Abstract Methods</a></span><span class="tabEnd"> </span></span><span id="t5" class="tableTab"><span><a href="javascript:show(16);">Default Methods</a></span><span class="tabEnd"> </span></span></caption> |
| <tr> |
| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colSecond" scope="col">Method</th> |
| <th class="colLast" scope="col">Description</th> |
| </tr> |
| <tr id="i0" class="altColor"> |
| <td class="colFirst"><code>default void</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#close()">close</a></span>()</code></th> |
| <td class="colLast"> |
| <div class="block">Some assigners may need to perform certain actions when their corresponding enumerators are |
| closed</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code><a href="GetSplitResult.html" title="class in org.apache.iceberg.flink.source.assigner">GetSplitResult</a></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getNext(java.lang.String)">getNext</a></span>​(java.lang.String hostname)</code></th> |
| <td class="colLast"> |
| <div class="block">Request a new split from the assigner when enumerator trying to assign splits to awaiting |
| readers.</div> |
| </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>java.util.concurrent.CompletableFuture<java.lang.Void></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#isAvailable()">isAvailable</a></span>()</code></th> |
| <td class="colLast"> |
| <div class="block">Enumerator can get a notification via CompletableFuture when the assigner has more splits |
| available later.</div> |
| </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code>default void</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#onCompletedSplits(java.util.Collection)">onCompletedSplits</a></span>​(java.util.Collection<java.lang.String> completedSplitIds)</code></th> |
| <td class="colLast"> |
| <div class="block">Some assigner (like event time alignment) may rack in-progress splits to advance watermark upon |
| completed splits</div> |
| </td> |
| </tr> |
| <tr id="i4" class="altColor"> |
| <td class="colFirst"><code>void</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#onDiscoveredSplits(java.util.Collection)">onDiscoveredSplits</a></span>​(java.util.Collection<<a href="../split/IcebergSourceSplit.html" title="class in org.apache.iceberg.flink.source.split">IcebergSourceSplit</a>> splits)</code></th> |
| <td class="colLast"> |
| <div class="block">Add new splits discovered by enumerator</div> |
| </td> |
| </tr> |
| <tr id="i5" class="rowColor"> |
| <td class="colFirst"><code>void</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#onUnassignedSplits(java.util.Collection)">onUnassignedSplits</a></span>​(java.util.Collection<<a href="../split/IcebergSourceSplit.html" title="class in org.apache.iceberg.flink.source.split">IcebergSourceSplit</a>> splits)</code></th> |
| <td class="colLast"> |
| <div class="block">Forward addSplitsBack event (for failed reader) to assigner</div> |
| </td> |
| </tr> |
| <tr id="i6" class="altColor"> |
| <td class="colFirst"><code>int</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#pendingSplitCount()">pendingSplitCount</a></span>()</code></th> |
| <td class="colLast"> |
| <div class="block">Return the number of pending splits that haven't been assigned yet.</div> |
| </td> |
| </tr> |
| <tr id="i7" class="rowColor"> |
| <td class="colFirst"><code>default void</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#start()">start</a></span>()</code></th> |
| <td class="colLast"> |
| <div class="block">Some assigners may need to start background threads or perform other activity such as |
| registering as listeners to updates from other event sources e.g., watermark tracker.</div> |
| </td> |
| </tr> |
| <tr id="i8" class="altColor"> |
| <td class="colFirst"><code>java.util.Collection<<a href="../split/IcebergSourceSplitState.html" title="class in org.apache.iceberg.flink.source.split">IcebergSourceSplitState</a>></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#state()">state</a></span>()</code></th> |
| <td class="colLast"> |
| <div class="block">Get assigner state for checkpointing.</div> |
| </td> |
| </tr> |
| </table> |
| </li> |
| </ul> |
| </section> |
| </li> |
| </ul> |
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| <!-- ============ METHOD DETAIL ========== --> |
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| <h3>Method Detail</h3> |
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| <li class="blockList"> |
| <h4>start</h4> |
| <pre class="methodSignature">default void start()</pre> |
| <div class="block">Some assigners may need to start background threads or perform other activity such as |
| registering as listeners to updates from other event sources e.g., watermark tracker.</div> |
| </li> |
| </ul> |
| <a id="close()"> |
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| <h4>close</h4> |
| <pre class="methodSignature">default void close()</pre> |
| <div class="block">Some assigners may need to perform certain actions when their corresponding enumerators are |
| closed</div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code>close</code> in interface <code>java.lang.AutoCloseable</code></dd> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code>close</code> in interface <code>java.io.Closeable</code></dd> |
| </dl> |
| </li> |
| </ul> |
| <a id="getNext(java.lang.String)"> |
| <!-- --> |
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| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>getNext</h4> |
| <pre class="methodSignature"><a href="GetSplitResult.html" title="class in org.apache.iceberg.flink.source.assigner">GetSplitResult</a> getNext​(@Nullable |
| java.lang.String hostname)</pre> |
| <div class="block">Request a new split from the assigner when enumerator trying to assign splits to awaiting |
| readers. |
| |
| <p>If enumerator wasn't able to assign the split (e.g., reader disconnected), enumerator should |
| call <a href="#onUnassignedSplits(java.util.Collection)"><code>onUnassignedSplits(java.util.Collection<org.apache.iceberg.flink.source.split.IcebergSourceSplit>)</code></a> to return the split.</div> |
| </li> |
| </ul> |
| <a id="onDiscoveredSplits(java.util.Collection)"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>onDiscoveredSplits</h4> |
| <pre class="methodSignature">void onDiscoveredSplits​(java.util.Collection<<a href="../split/IcebergSourceSplit.html" title="class in org.apache.iceberg.flink.source.split">IcebergSourceSplit</a>> splits)</pre> |
| <div class="block">Add new splits discovered by enumerator</div> |
| </li> |
| </ul> |
| <a id="onUnassignedSplits(java.util.Collection)"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>onUnassignedSplits</h4> |
| <pre class="methodSignature">void onUnassignedSplits​(java.util.Collection<<a href="../split/IcebergSourceSplit.html" title="class in org.apache.iceberg.flink.source.split">IcebergSourceSplit</a>> splits)</pre> |
| <div class="block">Forward addSplitsBack event (for failed reader) to assigner</div> |
| </li> |
| </ul> |
| <a id="onCompletedSplits(java.util.Collection)"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>onCompletedSplits</h4> |
| <pre class="methodSignature">default void onCompletedSplits​(java.util.Collection<java.lang.String> completedSplitIds)</pre> |
| <div class="block">Some assigner (like event time alignment) may rack in-progress splits to advance watermark upon |
| completed splits</div> |
| </li> |
| </ul> |
| <a id="state()"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>state</h4> |
| <pre class="methodSignature">java.util.Collection<<a href="../split/IcebergSourceSplitState.html" title="class in org.apache.iceberg.flink.source.split">IcebergSourceSplitState</a>> state()</pre> |
| <div class="block">Get assigner state for checkpointing. This is a super-set API that works for all currently |
| imagined assigners.</div> |
| </li> |
| </ul> |
| <a id="isAvailable()"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>isAvailable</h4> |
| <pre class="methodSignature">java.util.concurrent.CompletableFuture<java.lang.Void> isAvailable()</pre> |
| <div class="block">Enumerator can get a notification via CompletableFuture when the assigner has more splits |
| available later. Enumerator should schedule assignment in the thenAccept action of the future. |
| |
| <p>Assigner will return the same future if this method is called again before the previous |
| future is completed. |
| |
| <p>The future can be completed from other thread, e.g. the coordinator thread from another |
| thread for event time alignment. |
| |
| <p>If enumerator need to trigger action upon the future completion, it may want to run it in |
| the coordinator thread using <code>SplitEnumeratorContext.runInCoordinatorThread(Runnable)</code>.</div> |
| </li> |
| </ul> |
| <a id="pendingSplitCount()"> |
| <!-- --> |
| </a> |
| <ul class="blockListLast"> |
| <li class="blockList"> |
| <h4>pendingSplitCount</h4> |
| <pre class="methodSignature">int pendingSplitCount()</pre> |
| <div class="block">Return the number of pending splits that haven't been assigned yet. |
| |
| <p>The enumerator can poll this API to publish a metric on the number of pending splits. |
| |
| <p>The enumerator can also use this information to throttle split discovery for streaming read. |
| If there are already many pending splits tracked by the assigner, it is undesirable to discover |
| more splits and track them in the assigner. That will increase the memory footprint and |
| enumerator checkpoint size. |
| |
| <p>Throttling works better together with <a href="../ScanContext.html#maxPlanningSnapshotCount()"><code>ScanContext.maxPlanningSnapshotCount()</code></a>. |
| Otherwise, the next split discovery after throttling will just discover all non-enumerated |
| snapshots and splits, which defeats the purpose of throttling.</div> |
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