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| <h2 title="Annotation Type DoFn.GetSize" class="title">Annotation Type DoFn.GetSize</h2> |
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| <pre>@Documented |
| @Retention(value=RUNTIME) |
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| public static @interface <span class="memberNameLabel">DoFn.GetSize</span></pre> |
| <div class="block">Annotation for the method that returns the corresponding size for an element and restriction |
| pair. |
| |
| <p>Signature: <code>double getSize(InputT element, RestrictionT restriction);</code> |
| |
| <p>Returns a double representing the size of the element and restriction. |
| |
| <p>Splittable <a href="../../../../../org/apache/beam/sdk/transforms/DoFn.html" title="class in org.apache.beam.sdk.transforms"><code>DoFn</code></a>s should only provide this method if the default implementation |
| within the <a href="../../../../../org/apache/beam/sdk/transforms/splittabledofn/RestrictionTracker.html" title="class in org.apache.beam.sdk.transforms.splittabledofn"><code>RestrictionTracker</code></a> is an inaccurate representation of known work. |
| |
| <p>It is up to each splittable to convert between their natural representation of |
| outstanding work and this representation. For example: |
| |
| <ul> |
| <li>Block based file source (e.g. Avro): From the end of the current block, the remaining |
| number of bytes 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 not been processed. |
| <li>Key range based source (e.g. Shuffle, Bigtable, ...): Scale the start key to be one and |
| end key to be zero and interpolate the position of the next splittable key as the size. |
| If information about the probability density function or cumulative distribution function |
| is available, size 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 remaining bytes |
| can be used. |
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