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| <div class="subTitle">org.apache.beam.sdk.io.gcp.spanner.changestreams.action</div> |
| <h2 title="Class DetectNewPartitionsAction" class="title">Class DetectNewPartitionsAction</h2> |
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| <li>org.apache.beam.sdk.io.gcp.spanner.changestreams.action.DetectNewPartitionsAction</li> |
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| <pre>public class <span class="typeNameLabel">DetectNewPartitionsAction</span> |
| extends java.lang.Object</pre> |
| <div class="block">This class is responsible for scheduling partitions. It obtains partitions to be scheduled from |
| the partition metadata table. The full algorithm is described in <code>DetectNewPartitionsAction#run(RestrictionTracker, OutputReceiver, ManualWatermarkEstimator)</code>.</div> |
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| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../../../../org/apache/beam/sdk/io/gcp/spanner/changestreams/action/DetectNewPartitionsAction.html#DetectNewPartitionsAction-org.apache.beam.sdk.io.gcp.spanner.changestreams.dao.PartitionMetadataDao-org.apache.beam.sdk.io.gcp.spanner.changestreams.mapper.PartitionMetadataMapper-org.apache.beam.sdk.io.gcp.spanner.changestreams.ChangeStreamMetrics-org.joda.time.Duration-">DetectNewPartitionsAction</a></span>(<a href="../../../../../../../../../org/apache/beam/sdk/io/gcp/spanner/changestreams/dao/PartitionMetadataDao.html" title="class in org.apache.beam.sdk.io.gcp.spanner.changestreams.dao">PartitionMetadataDao</a> dao, |
| <a href="../../../../../../../../../org/apache/beam/sdk/io/gcp/spanner/changestreams/mapper/PartitionMetadataMapper.html" title="class in org.apache.beam.sdk.io.gcp.spanner.changestreams.mapper">PartitionMetadataMapper</a> mapper, |
| <a href="../../../../../../../../../org/apache/beam/sdk/io/gcp/spanner/changestreams/ChangeStreamMetrics.html" title="class in org.apache.beam.sdk.io.gcp.spanner.changestreams">ChangeStreamMetrics</a> metrics, |
| <a href="https://static.javadoc.io/joda-time/joda-time/2.10.10/org/joda/time/Duration.html?is-external=true" title="class or interface in org.joda.time">Duration</a> resumeDuration)</code> |
| <div class="block">Constructs an action class for detecting / scheduling new partitions.</div> |
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| <td class="colFirst"><code><a href="../../../../../../../../../org/apache/beam/sdk/transforms/DoFn.ProcessContinuation.html" title="class in org.apache.beam.sdk.transforms">DoFn.ProcessContinuation</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../../../org/apache/beam/sdk/io/gcp/spanner/changestreams/action/DetectNewPartitionsAction.html#run-org.apache.beam.sdk.transforms.splittabledofn.RestrictionTracker-org.apache.beam.sdk.transforms.DoFn.OutputReceiver-org.apache.beam.sdk.transforms.splittabledofn.ManualWatermarkEstimator-">run</a></span>(<a href="../../../../../../../../../org/apache/beam/sdk/transforms/splittabledofn/RestrictionTracker.html" title="class in org.apache.beam.sdk.transforms.splittabledofn">RestrictionTracker</a><<a href="../../../../../../../../../org/apache/beam/sdk/io/gcp/spanner/changestreams/restriction/TimestampRange.html" title="class in org.apache.beam.sdk.io.gcp.spanner.changestreams.restriction">TimestampRange</a>,com.google.cloud.Timestamp> tracker, |
| <a href="../../../../../../../../../org/apache/beam/sdk/transforms/DoFn.OutputReceiver.html" title="interface in org.apache.beam.sdk.transforms">DoFn.OutputReceiver</a><<a href="../../../../../../../../../org/apache/beam/sdk/io/gcp/spanner/changestreams/model/PartitionMetadata.html" title="class in org.apache.beam.sdk.io.gcp.spanner.changestreams.model">PartitionMetadata</a>> receiver, |
| <a href="../../../../../../../../../org/apache/beam/sdk/transforms/splittabledofn/ManualWatermarkEstimator.html" title="interface in org.apache.beam.sdk.transforms.splittabledofn">ManualWatermarkEstimator</a><<a href="https://static.javadoc.io/joda-time/joda-time/2.10.10/org/joda/time/Instant.html?is-external=true" title="class or interface in org.joda.time">Instant</a>> watermarkEstimator)</code> |
| <div class="block">Executes the main logic to schedule new partitions.</div> |
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| <h4>DetectNewPartitionsAction</h4> |
| <pre>public DetectNewPartitionsAction(<a href="../../../../../../../../../org/apache/beam/sdk/io/gcp/spanner/changestreams/dao/PartitionMetadataDao.html" title="class in org.apache.beam.sdk.io.gcp.spanner.changestreams.dao">PartitionMetadataDao</a> dao, |
| <a href="../../../../../../../../../org/apache/beam/sdk/io/gcp/spanner/changestreams/mapper/PartitionMetadataMapper.html" title="class in org.apache.beam.sdk.io.gcp.spanner.changestreams.mapper">PartitionMetadataMapper</a> mapper, |
| <a href="../../../../../../../../../org/apache/beam/sdk/io/gcp/spanner/changestreams/ChangeStreamMetrics.html" title="class in org.apache.beam.sdk.io.gcp.spanner.changestreams">ChangeStreamMetrics</a> metrics, |
| <a href="https://static.javadoc.io/joda-time/joda-time/2.10.10/org/joda/time/Duration.html?is-external=true" title="class or interface in org.joda.time">Duration</a> resumeDuration)</pre> |
| <div class="block">Constructs an action class for detecting / scheduling new partitions.</div> |
| </li> |
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| <a name="run-org.apache.beam.sdk.transforms.splittabledofn.RestrictionTracker-org.apache.beam.sdk.transforms.DoFn.OutputReceiver-org.apache.beam.sdk.transforms.splittabledofn.ManualWatermarkEstimator-"> |
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| <h4>run</h4> |
| <pre>public <a href="../../../../../../../../../org/apache/beam/sdk/transforms/DoFn.ProcessContinuation.html" title="class in org.apache.beam.sdk.transforms">DoFn.ProcessContinuation</a> run(<a href="../../../../../../../../../org/apache/beam/sdk/transforms/splittabledofn/RestrictionTracker.html" title="class in org.apache.beam.sdk.transforms.splittabledofn">RestrictionTracker</a><<a href="../../../../../../../../../org/apache/beam/sdk/io/gcp/spanner/changestreams/restriction/TimestampRange.html" title="class in org.apache.beam.sdk.io.gcp.spanner.changestreams.restriction">TimestampRange</a>,com.google.cloud.Timestamp> tracker, |
| <a href="../../../../../../../../../org/apache/beam/sdk/transforms/DoFn.OutputReceiver.html" title="interface in org.apache.beam.sdk.transforms">DoFn.OutputReceiver</a><<a href="../../../../../../../../../org/apache/beam/sdk/io/gcp/spanner/changestreams/model/PartitionMetadata.html" title="class in org.apache.beam.sdk.io.gcp.spanner.changestreams.model">PartitionMetadata</a>> receiver, |
| <a href="../../../../../../../../../org/apache/beam/sdk/transforms/splittabledofn/ManualWatermarkEstimator.html" title="interface in org.apache.beam.sdk.transforms.splittabledofn">ManualWatermarkEstimator</a><<a href="https://static.javadoc.io/joda-time/joda-time/2.10.10/org/joda/time/Instant.html?is-external=true" title="class or interface in org.joda.time">Instant</a>> watermarkEstimator)</pre> |
| <div class="block">Executes the main logic to schedule new partitions. It follows this procedure periodically: |
| |
| <ol> |
| <li>Fetches the min watermark from all the unfinished partitions in the metadata tables. |
| <li>If there are no unfinished partitions, this function will stop and not be re-scheduled. |
| <li>Updates the component's watermark to the min fetched. |
| <li>Fetches the read timestamp from the restriction. |
| <li>Fetches all the partitions with a createdAt timestamp > read timestamp. |
| <li>Groups the partitions by createdAt timestamp. |
| <li>Process the groups in ascending order of createdAt timestamp (oldest first) |
| <li>For each group, updates the state to <a href="../../../../../../../../../org/apache/beam/sdk/io/gcp/spanner/changestreams/model/PartitionMetadata.State.html#SCHEDULED"><code>PartitionMetadata.State.SCHEDULED</code></a>. |
| <li>Tries to claim the createdAt timestamp of the group within the restriction. |
| <li>If it is possible to claim the timestamp, outputs each partition to the next stage. It |
| then proceeds to process the next batch. When there are no more batches to process, |
| schedules the function to resume after the configured resume duration. |
| <li>If it is not possible to claim the timestamp, stops. |
| </ol></div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>tracker</code> - an instance of <a href="../../../../../../../../../org/apache/beam/sdk/io/gcp/spanner/changestreams/restriction/DetectNewPartitionsRangeTracker.html" title="class in org.apache.beam.sdk.io.gcp.spanner.changestreams.restriction"><code>DetectNewPartitionsRangeTracker</code></a></dd> |
| <dd><code>receiver</code> - a <a href="../../../../../../../../../org/apache/beam/sdk/io/gcp/spanner/changestreams/model/PartitionMetadata.html" title="class in org.apache.beam.sdk.io.gcp.spanner.changestreams.model"><code>PartitionMetadata</code></a> <a href="../../../../../../../../../org/apache/beam/sdk/transforms/DoFn.OutputReceiver.html" title="interface in org.apache.beam.sdk.transforms"><code>DoFn.OutputReceiver</code></a></dd> |
| <dd><code>watermarkEstimator</code> - a <a href="../../../../../../../../../org/apache/beam/sdk/transforms/splittabledofn/ManualWatermarkEstimator.html" title="interface in org.apache.beam.sdk.transforms.splittabledofn"><code>ManualWatermarkEstimator</code></a> of <a href="https://static.javadoc.io/joda-time/joda-time/2.10.10/org/joda/time/Instant.html?is-external=true" title="class or interface in org.joda.time"><code>Instant</code></a></dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>a <a href="../../../../../../../../../org/apache/beam/sdk/transforms/DoFn.ProcessContinuation.html#stop--"><code>DoFn.ProcessContinuation.stop()</code></a> if there are no more partitions to process or |
| <a href="../../../../../../../../../org/apache/beam/sdk/transforms/DoFn.ProcessContinuation.html#resume--"><code>DoFn.ProcessContinuation.resume()</code></a> to re-schedule the function after the configured |
| interval.</dd> |
| </dl> |
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