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| <h2 title="Interface RestrictionTracker.HasProgress" class="title">Interface RestrictionTracker.HasProgress</h2> |
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| <dt>All Known Implementing Classes:</dt> |
| <dd><a href="../../../../../../org/apache/beam/sdk/transforms/splittabledofn/ByteKeyRangeTracker.html" title="class in org.apache.beam.sdk.transforms.splittabledofn">ByteKeyRangeTracker</a>, <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">DetectNewPartitionsRangeTracker</a>, <a href="../../../../../../org/apache/beam/sdk/transforms/splittabledofn/GrowableOffsetRangeTracker.html" title="class in org.apache.beam.sdk.transforms.splittabledofn">GrowableOffsetRangeTracker</a>, <a href="../../../../../../org/apache/beam/sdk/transforms/splittabledofn/OffsetRangeTracker.html" title="class in org.apache.beam.sdk.transforms.splittabledofn">OffsetRangeTracker</a>, <a href="../../../../../../org/apache/beam/sdk/io/parquet/ParquetIO.ReadFiles.BlockTracker.html" title="class in org.apache.beam.sdk.io.parquet">ParquetIO.ReadFiles.BlockTracker</a>, <a href="../../../../../../org/apache/beam/sdk/transforms/PeriodicSequence.OutputRangeTracker.html" title="class in org.apache.beam.sdk.transforms">PeriodicSequence.OutputRangeTracker</a>, <a href="../../../../../../org/apache/beam/sdk/io/gcp/spanner/changestreams/restriction/ReadChangeStreamPartitionRangeTracker.html" title="class in org.apache.beam.sdk.io.gcp.spanner.changestreams.restriction">ReadChangeStreamPartitionRangeTracker</a>, <a href="../../../../../../org/apache/beam/sdk/io/gcp/spanner/changestreams/restriction/TimestampRangeTracker.html" title="class in org.apache.beam.sdk.io.gcp.spanner.changestreams.restriction">TimestampRangeTracker</a>, <a href="../../../../../../org/apache/beam/sdk/io/gcp/pubsublite/internal/TrackerWithProgress.html" title="class in org.apache.beam.sdk.io.gcp.pubsublite.internal">TrackerWithProgress</a></dd> |
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| <dd><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/transforms/splittabledofn/RestrictionTracker.html" title="type parameter in RestrictionTracker">RestrictionT</a>,<a href="../../../../../../org/apache/beam/sdk/transforms/splittabledofn/RestrictionTracker.html" title="type parameter in RestrictionTracker">PositionT</a>></dd> |
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| <pre>public static interface <span class="typeNameLabel">RestrictionTracker.HasProgress</span></pre> |
| <div class="block">All <a href="../../../../../../org/apache/beam/sdk/transforms/splittabledofn/RestrictionTracker.html" title="class in org.apache.beam.sdk.transforms.splittabledofn"><code>RestrictionTracker</code></a>s SHOULD implement this interface to improve auto-scaling and |
| splitting performance.</div> |
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| <td class="colFirst"><code><a href="../../../../../../org/apache/beam/sdk/transforms/splittabledofn/RestrictionTracker.Progress.html" title="class in org.apache.beam.sdk.transforms.splittabledofn">RestrictionTracker.Progress</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/beam/sdk/transforms/splittabledofn/RestrictionTracker.HasProgress.html#getProgress--">getProgress</a></span>()</code> |
| <div class="block">A representation for the amount of known completed and known remaining work.</div> |
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| <h4>getProgress</h4> |
| <pre><a href="../../../../../../org/apache/beam/sdk/transforms/splittabledofn/RestrictionTracker.Progress.html" title="class in org.apache.beam.sdk.transforms.splittabledofn">RestrictionTracker.Progress</a> getProgress()</pre> |
| <div class="block">A representation for the amount of known completed and known remaining work. |
| |
| <p>It is up to each restriction tracker to convert between their natural representation of |
| completed and remaining work and the <code>double</code> representation. For example: |
| |
| <ul> |
| <li>Block based file source (e.g. Avro): The number of bytes from the beginning of the |
| restriction to the current block and the number of bytes from the current block to the |
| end of the restriction. |
| <li>Pull based queue based source (e.g. Pubsub): The local/global size available in number |
| of messages or number of <code>message bytes</code> that have processed and the number of |
| messages or number of <code>message bytes</code> that are outstanding. |
| <li>Key range based source (e.g. BigQuery, Bigtable, ...): Scale the start key to be one |
| and end key to be zero and interpolate the position of the next splittable key as a |
| position. If information about the probability density function or cumulative |
| distribution function is available, work completed and work remaining interpolation can |
| be improved. Alternatively, if the number of encoded bytes for the keys and values is |
| known for the key range, the number of completed and remaining bytes can be used. |
| </ul> |
| |
| <p>The work completed and work remaining must be of the same scale whether that be number of |
| messages or number of bytes and should never represent two distinct unit types.</div> |
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