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| <div class="subTitle">org.apache.beam.sdk.io.aws2.dynamodb</div> |
| <h2 title="Class DynamoDBIO" class="title">Class DynamoDBIO</h2> |
| </div> |
| <div class="contentContainer"> |
| <ul class="inheritance"> |
| <li>java.lang.Object</li> |
| <li> |
| <ul class="inheritance"> |
| <li>org.apache.beam.sdk.io.aws2.dynamodb.DynamoDBIO</li> |
| </ul> |
| </li> |
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| <div class="description"> |
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| <br> |
| <pre><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#SOURCE_SINK">SOURCE_SINK</a>) |
| public final class <span class="typeNameLabel">DynamoDBIO</span> |
| extends java.lang.Object</pre> |
| <div class="block">IO to read from and write to <a href="https://aws.amazon.com/dynamodb/">DynamoDB</a> tables. |
| |
| <h3>Reading from DynamoDB</h3> |
| |
| <p>Example usage: |
| |
| <pre><code> |
| PCollection<List<Map<String, AttributeValue>>> output = |
| pipeline.apply( |
| DynamoDBIO.<List<Map<String, AttributeValue>>>read() |
| .withScanRequestFn(in -> ScanRequest.builder().tableName(tableName).totalSegments(1).build()) |
| .items()); // ScanResponse items mapper |
| </code></pre> |
| |
| <p>At a minimum you have to provide: |
| |
| <ul> |
| <li>a <code>scanRequestFn</code> providing the <a href="https://static.javadoc.io/software.amazon.awssdk/dynamodb/2.17.127/software/amazon/awssdk/services/dynamodb/model/ScanRequest.html?is-external=true" title="class or interface in software.amazon.awssdk.services.dynamodb.model"><code>ScanRequest</code></a> instance; <code>table name</code> and |
| <code>total segments</code> are required. Note: Choose <code>total segments</code> according to the |
| number of workers used. |
| <li>a <code>scanResponseMapperFn</code> to map the <a href="https://static.javadoc.io/software.amazon.awssdk/dynamodb/2.17.127/software/amazon/awssdk/services/dynamodb/model/ScanResponse.html?is-external=true" title="class or interface in software.amazon.awssdk.services.dynamodb.model"><code>ScanResponse</code></a> to the expected output type, |
| such as <a href="../../../../../../../org/apache/beam/sdk/io/aws2/dynamodb/DynamoDBIO.Read.html#items--"><code>DynamoDBIO.Read.items()</code></a>. |
| </ul> |
| |
| <h3>Writing to DynamoDB</h3> |
| |
| <p>Example usage: |
| |
| <pre><code> |
| PCollection<T> data = ...; |
| SerializableFunction<T, WriteRequest> requestBuilder = ...; |
| data.apply( |
| DynamoDBIO.<WriteRequest>write() |
| .withWriteRequestMapperFn(t -> KV.of(tableName, requestBuilder.apply(t)))); |
| </code></pre> |
| |
| <p>At a minimum you have to provide a <code>writeRequestMapperFn</code> to map each element into a |
| <a href="../../../../../../../org/apache/beam/sdk/values/KV.html" title="class in org.apache.beam.sdk.values"><code>KV</code></a> of <code>table name</code> and <a href="https://static.javadoc.io/software.amazon.awssdk/dynamodb/2.17.127/software/amazon/awssdk/services/dynamodb/model/WriteRequest.html?is-external=true" title="class or interface in software.amazon.awssdk.services.dynamodb.model"><code>WriteRequest</code></a>. |
| |
| <p><b>Note:</b> AWS does not allow writing duplicate keys within a single batch operation. If |
| primary keys possibly repeat in your stream (i.e. an upsert stream), you may encounter a |
| `ValidationError`. To address this you have to provide the key names corresponding to your |
| primary key using <a href="../../../../../../../org/apache/beam/sdk/io/aws2/dynamodb/DynamoDBIO.Write.html#withDeduplicateKeys-java.util.List-"><code>DynamoDBIO.Write.withDeduplicateKeys(List)</code></a>. Based on these keys only the last |
| observed element is kept. Nevertheless, if no deduplication keys are provided, identical elements |
| are still deduplicated. |
| |
| <h3>Configuration of AWS clients</h3> |
| |
| <p>AWS clients for all AWS IOs can be configured using <a href="../../../../../../../org/apache/beam/sdk/io/aws2/options/AwsOptions.html" title="interface in org.apache.beam.sdk.io.aws2.options"><code>AwsOptions</code></a>, e.g. <code>--awsRegion=us-west-1</code>. <a href="../../../../../../../org/apache/beam/sdk/io/aws2/options/AwsOptions.html" title="interface in org.apache.beam.sdk.io.aws2.options"><code>AwsOptions</code></a> contain reasonable defaults based on default providers |
| for <a href="https://static.javadoc.io/software.amazon.awssdk/regions/2.17.127/software/amazon/awssdk/regions/Region.html?is-external=true" title="class or interface in software.amazon.awssdk.regions"><code>Region</code></a> and <a href="https://static.javadoc.io/software.amazon.awssdk/auth/2.17.127/software/amazon/awssdk/auth/credentials/AwsCredentialsProvider.html?is-external=true" title="class or interface in software.amazon.awssdk.auth.credentials"><code>AwsCredentialsProvider</code></a>. |
| |
| <p>If you require more advanced configuration, you may change the <a href="../../../../../../../org/apache/beam/sdk/io/aws2/common/ClientBuilderFactory.html" title="interface in org.apache.beam.sdk.io.aws2.common"><code>ClientBuilderFactory</code></a> |
| using <a href="../../../../../../../org/apache/beam/sdk/io/aws2/options/AwsOptions.html#setClientBuilderFactory-java.lang.Class-"><code>AwsOptions.setClientBuilderFactory(Class)</code></a>. |
| |
| <p>Configuration for a specific IO can be overwritten using <code>withClientConfiguration()</code>, |
| which also allows to configure the retry behavior for the respective IO. |
| |
| <h4>Retries</h4> |
| |
| <p>Retries for failed requests can be configured using <code>ClientConfiguration.Builder#retry(Consumer)</code> and are handled by the AWS SDK unless there's a |
| partial success (batch requests). The SDK uses a backoff strategy with equal jitter for computing |
| the delay before the next retry. |
| |
| <p><b>Note:</b> Once retries are exhausted the error is surfaced to the runner which <em>may</em> |
| then opt to retry the current partition in entirety or abort if the max number of retries of the |
| runner is reached.</div> |
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| <tr class="altColor"> |
| <td class="colFirst"><code>static class </code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/beam/sdk/io/aws2/dynamodb/DynamoDBIO.Read.html" title="class in org.apache.beam.sdk.io.aws2.dynamodb">DynamoDBIO.Read</a><<a href="../../../../../../../org/apache/beam/sdk/io/aws2/dynamodb/DynamoDBIO.Read.html" title="type parameter in DynamoDBIO.Read">T</a>></span></code> |
| <div class="block">Read data from DynamoDB using <a href="../../../../../../../org/apache/beam/sdk/io/aws2/dynamodb/DynamoDBIO.Read.html#getScanRequestFn--"><code>DynamoDBIO.Read.getScanRequestFn()</code></a> and emit an element of type <code>T</code> |
| for each <a href="https://static.javadoc.io/software.amazon.awssdk/dynamodb/2.17.127/software/amazon/awssdk/services/dynamodb/model/ScanResponse.html?is-external=true" title="class or interface in software.amazon.awssdk.services.dynamodb.model"><code>ScanResponse</code></a> using the mapping function <a href="../../../../../../../org/apache/beam/sdk/io/aws2/dynamodb/DynamoDBIO.Read.html#getScanResponseMapperFn--"><code>DynamoDBIO.Read.getScanResponseMapperFn()</code></a>.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>static class </code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/beam/sdk/io/aws2/dynamodb/DynamoDBIO.RetryConfiguration.html" title="class in org.apache.beam.sdk.io.aws2.dynamodb">DynamoDBIO.RetryConfiguration</a></span></code> |
| <div class="block"><span class="deprecatedLabel">Deprecated.</span> |
| <div class="block"><span class="deprecationComment">Use <a href="../../../../../../../org/apache/beam/sdk/io/aws2/common/RetryConfiguration.html" title="class in org.apache.beam.sdk.io.aws2.common"><code>RetryConfiguration</code></a> instead to |
| delegate retries to the AWS SDK.</span></div> |
| </div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>static class </code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/beam/sdk/io/aws2/dynamodb/DynamoDBIO.Write.html" title="class in org.apache.beam.sdk.io.aws2.dynamodb">DynamoDBIO.Write</a><<a href="../../../../../../../org/apache/beam/sdk/io/aws2/dynamodb/DynamoDBIO.Write.html" title="type parameter in DynamoDBIO.Write">T</a>></span></code> |
| <div class="block">Write a PCollection<T> data into DynamoDB.</div> |
| </td> |
| </tr> |
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| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/beam/sdk/io/aws2/dynamodb/DynamoDBIO.html#DynamoDBIO--">DynamoDBIO</a></span>()</code> </td> |
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| <td class="colFirst"><code>static <T> <a href="../../../../../../../org/apache/beam/sdk/io/aws2/dynamodb/DynamoDBIO.Read.html" title="class in org.apache.beam.sdk.io.aws2.dynamodb">DynamoDBIO.Read</a><T></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/beam/sdk/io/aws2/dynamodb/DynamoDBIO.html#read--">read</a></span>()</code> </td> |
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| <td class="colFirst"><code>static <T> <a href="../../../../../../../org/apache/beam/sdk/io/aws2/dynamodb/DynamoDBIO.Write.html" title="class in org.apache.beam.sdk.io.aws2.dynamodb">DynamoDBIO.Write</a><T></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/beam/sdk/io/aws2/dynamodb/DynamoDBIO.html#write--">write</a></span>()</code> </td> |
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| <pre>public DynamoDBIO()</pre> |
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| <pre>public static <T> <a href="../../../../../../../org/apache/beam/sdk/io/aws2/dynamodb/DynamoDBIO.Read.html" title="class in org.apache.beam.sdk.io.aws2.dynamodb">DynamoDBIO.Read</a><T> read()</pre> |
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| <pre>public static <T> <a href="../../../../../../../org/apache/beam/sdk/io/aws2/dynamodb/DynamoDBIO.Write.html" title="class in org.apache.beam.sdk.io.aws2.dynamodb">DynamoDBIO.Write</a><T> write()</pre> |
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