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| <div class="subTitle">org.apache.beam.sdk.io.gcp.spanner</div> |
| <h2 title="Class SpannerIO" class="title">Class SpannerIO</h2> |
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| <li>java.lang.Object</li> |
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| <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 class <span class="typeNameLabel">SpannerIO</span> |
| extends java.lang.Object</pre> |
| <div class="block">Experimental <a href="../../../../../../../org/apache/beam/sdk/transforms/PTransform.html" title="class in org.apache.beam.sdk.transforms"><code>Transforms</code></a> for reading from and writing to <a |
| href="https://cloud.google.com/spanner">Google Cloud Spanner</a>. |
| |
| <h3>Reading from Cloud Spanner</h3> |
| |
| <p>To read from Cloud Spanner, apply <a href="../../../../../../../org/apache/beam/sdk/io/gcp/spanner/SpannerIO.Read.html" title="class in org.apache.beam.sdk.io.gcp.spanner"><code>SpannerIO.Read</code></a> transformation. It will return a |
| <a href="../../../../../../../org/apache/beam/sdk/values/PCollection.html" title="class in org.apache.beam.sdk.values"><code>PCollection</code></a> of <a href="https://static.javadoc.io/com.google.cloud/google-cloud-spanner/1.6.0/com/google/cloud/spanner/Struct.html?is-external=true" title="class or interface in com.google.cloud.spanner"><code>Structs</code></a>, where each element represents an individual row |
| returned from the read operation. Both Query and Read APIs are supported. See more information |
| about <a href="https://cloud.google.com/spanner/docs/reads">reading from Cloud Spanner</a> |
| |
| <p>To execute a <strong>query</strong>, specify a <a href="../../../../../../../org/apache/beam/sdk/io/gcp/spanner/SpannerIO.Read.html#withQuery-com.google.cloud.spanner.Statement-"><code>SpannerIO.Read.withQuery(Statement)</code></a> or |
| <a href="../../../../../../../org/apache/beam/sdk/io/gcp/spanner/SpannerIO.Read.html#withQuery-java.lang.String-"><code>SpannerIO.Read.withQuery(String)</code></a> during the construction of the transform. |
| |
| <pre><code> |
| PCollection<Struct> rows = p.apply( |
| SpannerIO.read() |
| .withInstanceId(instanceId) |
| .withDatabaseId(dbId) |
| .withQuery("SELECT id, name, email FROM users")); |
| </code></pre> |
| |
| <p>To use the Read API, specify a <a href="../../../../../../../org/apache/beam/sdk/io/gcp/spanner/SpannerIO.Read.html#withTable-java.lang.String-"><code>table name</code></a> and a |
| <a href="../../../../../../../org/apache/beam/sdk/io/gcp/spanner/SpannerIO.Read.html#withColumns-java.util.List-"><code>list of columns</code></a>. |
| |
| <pre><code> |
| PCollection<Struct> rows = p.apply( |
| SpannerIO.read() |
| .withInstanceId(instanceId) |
| .withDatabaseId(dbId) |
| .withTable("users") |
| .withColumns("id", "name", "email")); |
| </code></pre> |
| |
| <p>To optimally read using index, specify the index name using <a href="../../../../../../../org/apache/beam/sdk/io/gcp/spanner/SpannerIO.Read.html#withIndex-java.lang.String-"><code>SpannerIO.Read.withIndex(java.lang.String)</code></a>. |
| |
| <p>The transform is guaranteed to be executed on a consistent snapshot of data, utilizing the |
| power of read only transactions. Staleness of data can be controlled using <a href="../../../../../../../org/apache/beam/sdk/io/gcp/spanner/SpannerIO.Read.html#withTimestampBound-com.google.cloud.spanner.TimestampBound-"><code>SpannerIO.Read.withTimestampBound(com.google.cloud.spanner.TimestampBound)</code></a> or <a href="../../../../../../../org/apache/beam/sdk/io/gcp/spanner/SpannerIO.Read.html#withTimestamp-com.google.cloud.Timestamp-"><code>SpannerIO.Read.withTimestamp(Timestamp)</code></a> methods. <a |
| href="https://cloud.google.com/spanner/docs/transactions">Read more</a> about transactions in |
| Cloud Spanner. |
| |
| <p>It is possible to read several <a href="../../../../../../../org/apache/beam/sdk/values/PCollection.html" title="class in org.apache.beam.sdk.values"><code>PCollections</code></a> within a single transaction. |
| Apply <a href="../../../../../../../org/apache/beam/sdk/io/gcp/spanner/SpannerIO.html#createTransaction--"><code>createTransaction()</code></a> transform, that lazily creates a transaction. The |
| result of this transformation can be passed to read operation using <a href="../../../../../../../org/apache/beam/sdk/io/gcp/spanner/SpannerIO.Read.html#withTransaction-org.apache.beam.sdk.values.PCollectionView-"><code>SpannerIO.Read.withTransaction(PCollectionView)</code></a>. |
| |
| <pre><code> |
| SpannerConfig spannerConfig = ... |
| |
| PCollectionView<Transaction> tx = |
| p.apply( |
| SpannerIO.createTransaction() |
| .withSpannerConfig(spannerConfig) |
| .withTimestampBound(TimestampBound.strong())); |
| |
| PCollection<Struct> users = p.apply( |
| SpannerIO.read() |
| .withSpannerConfig(spannerConfig) |
| .withQuery("SELECT name, email FROM users") |
| .withTransaction(tx)); |
| |
| PCollection<Struct> tweets = p.apply( |
| SpannerIO.read() |
| .withSpannerConfig(spannerConfig) |
| .withQuery("SELECT user, tweet, date FROM tweets") |
| .withTransaction(tx)); |
| </code></pre> |
| |
| <h3>Writing to Cloud Spanner</h3> |
| |
| <p>The Cloud Spanner <a href="../../../../../../../org/apache/beam/sdk/io/gcp/spanner/SpannerIO.Write.html" title="class in org.apache.beam.sdk.io.gcp.spanner"><code>SpannerIO.Write</code></a> transform writes to Cloud Spanner by executing a |
| collection of input row <a href="https://static.javadoc.io/com.google.cloud/google-cloud-spanner/1.6.0/com/google/cloud/spanner/Mutation.html?is-external=true" title="class or interface in com.google.cloud.spanner"><code>Mutations</code></a>. The mutations are grouped into batches for |
| efficiency. |
| |
| <p>To configure the write transform, create an instance using <a href="../../../../../../../org/apache/beam/sdk/io/gcp/spanner/SpannerIO.html#write--"><code>write()</code></a> and then specify |
| the destination Cloud Spanner instance (<a href="../../../../../../../org/apache/beam/sdk/io/gcp/spanner/SpannerIO.Write.html#withInstanceId-java.lang.String-"><code>SpannerIO.Write.withInstanceId(String)</code></a> and destination |
| database (<a href="../../../../../../../org/apache/beam/sdk/io/gcp/spanner/SpannerIO.Write.html#withDatabaseId-java.lang.String-"><code>SpannerIO.Write.withDatabaseId(String)</code></a>). For example: |
| |
| <pre><code> |
| // Earlier in the pipeline, create a PCollection of Mutations to be written to Cloud Spanner. |
| PCollection<Mutation> mutations = ...; |
| // Write mutations. |
| SpannerWriteResult result = mutations.apply( |
| "Write", SpannerIO.write().withInstanceId("instance").withDatabaseId("database")); |
| </code></pre> |
| |
| <h3>SpannerWriteResult</h3> |
| |
| The <a href="../../../../../../../org/apache/beam/sdk/io/gcp/spanner/SpannerWriteResult.html" title="class in org.apache.beam.sdk.io.gcp.spanner"><code>SpannerWriteResult</code></a> object contains the results of the transform, |
| including a <a href="../../../../../../../org/apache/beam/sdk/values/PCollection.html" title="class in org.apache.beam.sdk.values"><code>PCollection</code></a> of MutationGroups that failed to write, and a <a href="../../../../../../../org/apache/beam/sdk/values/PCollection.html" title="class in org.apache.beam.sdk.values"><code>PCollection</code></a> |
| that can be used in batch pipelines as a completion signal to <a href="../../../../../../../org/apache/beam/sdk/transforms/Wait.html" title="class in org.apache.beam.sdk.transforms"><code>Wait.OnSignal</code></a> to indicate when all input has been written. |
| Note that in streaming pipelines, this signal will never be triggered as the input is unbounded |
| and this <a href="../../../../../../../org/apache/beam/sdk/values/PCollection.html" title="class in org.apache.beam.sdk.values"><code>PCollection</code></a> is using the <a href="../../../../../../../org/apache/beam/sdk/transforms/windowing/GlobalWindow.html" title="class in org.apache.beam.sdk.transforms.windowing"><code>GlobalWindow</code></a>. |
| |
| <h3>Batching</h3> |
| |
| <p>To reduce the number of transactions sent to Spanner, the <a href="https://static.javadoc.io/com.google.cloud/google-cloud-spanner/1.6.0/com/google/cloud/spanner/Mutation.html?is-external=true" title="class or interface in com.google.cloud.spanner"><code>Mutations</code></a> are |
| grouped into batches The default maximum size of the batch is set to 1MB or 5000 mutated cells. |
| To override this use <a href="../../../../../../../org/apache/beam/sdk/io/gcp/spanner/SpannerIO.Write.html#withBatchSizeBytes-long-"><code>withBatchSizeBytes()</code></a> and <a href="../../../../../../../org/apache/beam/sdk/io/gcp/spanner/SpannerIO.Write.html#withMaxNumMutations-long-"><code>withMaxNumMutations()</code></a>. Setting either to a small value or zero |
| disables batching. |
| |
| <p>Note that the <a |
| href="https://cloud.google.com/spanner/quotas#limits_for_creating_reading_updating_and_deleting_data">maximum |
| size of a single transaction</a> is 20,000 mutated cells - including cells in indexes. If you |
| have a large number of indexes and are getting exceptions with message: <tt>INVALID_ARGUMENT: The |
| transaction contains too many mutations</tt> you will need to specify a smaller number of <code>MaxNumMutations</code>. |
| |
| <p>The batches written are obtained from by grouping enough <a href="https://static.javadoc.io/com.google.cloud/google-cloud-spanner/1.6.0/com/google/cloud/spanner/Mutation.html?is-external=true" title="class or interface in com.google.cloud.spanner"><code>Mutations</code></a> from the |
| Bundle provided by Beam to form (by default) 1000 batches. This group of <a href="https://static.javadoc.io/com.google.cloud/google-cloud-spanner/1.6.0/com/google/cloud/spanner/Mutation.html?is-external=true" title="class or interface in com.google.cloud.spanner"><code>Mutations</code></a> is then sorted by Key, and the batches are created from the sorted group. This so that |
| each batch will have keys that are 'close' to each other to optimise write performance. This |
| grouping factor (number of batches) is controlled by the parameter <a href="../../../../../../../org/apache/beam/sdk/io/gcp/spanner/SpannerIO.Write.html#withGroupingFactor-int-"><code>withGroupingFactor()</code></a>.<br> |
| Note that each worker will need enough memory to hold <code>GroupingFactor x MaxBatchSizeBytes</code> |
| Mutations, so if you have a large <code>MaxBatchSize</code> you may need to reduce <code>GroupingFactor</code> |
| |
| <h3>Database Schema Preparation</h3> |
| |
| <p>The Write transform reads the database schema on pipeline start. If the schema is created as |
| part of the same pipeline, this transform needs to wait until this has happened. Use <a href="../../../../../../../org/apache/beam/sdk/io/gcp/spanner/SpannerIO.Write.html#withSchemaReadySignal-org.apache.beam.sdk.values.PCollection-"><code>SpannerIO.Write.withSchemaReadySignal(PCollection)</code></a> to pass a signal <a href="../../../../../../../org/apache/beam/sdk/values/PCollection.html" title="class in org.apache.beam.sdk.values"><code>PCollection</code></a> which will be used |
| with <code>Wait.OnSignal</code> to prevent the schema from being read until it is ready. The Write |
| transform will be paused until the signal <a href="../../../../../../../org/apache/beam/sdk/values/PCollection.html" title="class in org.apache.beam.sdk.values"><code>PCollection</code></a> is closed. |
| |
| <h3>Transactions</h3> |
| |
| <p>The transform does not provide same transactional guarantees as Cloud Spanner. In particular, |
| |
| <ul> |
| <li>Individual Mutations are submitted atomically, but all Mutations are not submitted in the |
| same transaction. |
| <li>A Mutation is applied at least once; |
| <li>If the pipeline was unexpectedly stopped, mutations that were already applied will not get |
| rolled back. |
| </ul> |
| |
| <p>Use <a href="../../../../../../../org/apache/beam/sdk/io/gcp/spanner/MutationGroup.html" title="class in org.apache.beam.sdk.io.gcp.spanner"><code>MutationGroups</code></a> with the <a href="../../../../../../../org/apache/beam/sdk/io/gcp/spanner/SpannerIO.WriteGrouped.html" title="class in org.apache.beam.sdk.io.gcp.spanner"><code>SpannerIO.WriteGrouped</code></a> transform to ensure |
| that a small set mutations is bundled together. It is guaranteed that mutations in a <a href="../../../../../../../org/apache/beam/sdk/io/gcp/spanner/MutationGroup.html" title="class in org.apache.beam.sdk.io.gcp.spanner"><code>MutationGroup</code></a> are submitted in the same transaction. Note that a MutationGroup must not exceed |
| the Spanner transaction limits. |
| |
| <pre><code> |
| // Earlier in the pipeline, create a PCollection of MutationGroups to be written to Cloud Spanner. |
| PCollection<MutationGroup> mutationGroups = ...; |
| // Write mutation groups. |
| SpannerWriteResult result = mutationGroups.apply( |
| "Write", |
| SpannerIO.write().withInstanceId("instance").withDatabaseId("database").grouped()); |
| </code></pre> |
| |
| <h3>Streaming Support</h3> |
| |
| <p><a href="../../../../../../../org/apache/beam/sdk/io/gcp/spanner/SpannerIO.Write.html" title="class in org.apache.beam.sdk.io.gcp.spanner"><code>SpannerIO.Write</code></a> can be used as a streaming sink, however as with batch mode note that |
| the write order of individual <a href="https://static.javadoc.io/com.google.cloud/google-cloud-spanner/1.6.0/com/google/cloud/spanner/Mutation.html?is-external=true" title="class or interface in com.google.cloud.spanner"><code>Mutation</code></a>/<a href="../../../../../../../org/apache/beam/sdk/io/gcp/spanner/MutationGroup.html" title="class in org.apache.beam.sdk.io.gcp.spanner"><code>MutationGroup</code></a> objects is not guaranteed.</div> |
| </li> |
| </ul> |
| </div> |
| <div class="summary"> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <!-- ======== NESTED CLASS SUMMARY ======== --> |
| <ul class="blockList"> |
| <li class="blockList"><a name="nested.class.summary"> |
| <!-- --> |
| </a> |
| <h3>Nested Class Summary</h3> |
| <table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="Nested Class Summary table, listing nested classes, and an explanation"> |
| <caption><span>Nested Classes</span><span class="tabEnd"> </span></caption> |
| <tr> |
| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colLast" scope="col">Class and Description</th> |
| </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/gcp/spanner/SpannerIO.CreateTransaction.html" title="class in org.apache.beam.sdk.io.gcp.spanner">SpannerIO.CreateTransaction</a></span></code> |
| <div class="block">A <a href="../../../../../../../org/apache/beam/sdk/transforms/PTransform.html" title="class in org.apache.beam.sdk.transforms"><code>PTransform</code></a> that create a transaction.</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/gcp/spanner/SpannerIO.FailureMode.html" title="enum in org.apache.beam.sdk.io.gcp.spanner">SpannerIO.FailureMode</a></span></code> |
| <div class="block">A failure handling strategy.</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/gcp/spanner/SpannerIO.Read.html" title="class in org.apache.beam.sdk.io.gcp.spanner">SpannerIO.Read</a></span></code> |
| <div class="block">Implementation of <a href="../../../../../../../org/apache/beam/sdk/io/gcp/spanner/SpannerIO.html#read--"><code>read()</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/gcp/spanner/SpannerIO.ReadAll.html" title="class in org.apache.beam.sdk.io.gcp.spanner">SpannerIO.ReadAll</a></span></code> |
| <div class="block">Implementation of <a href="../../../../../../../org/apache/beam/sdk/io/gcp/spanner/SpannerIO.html#readAll--"><code>readAll()</code></a>.</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/gcp/spanner/SpannerIO.Write.html" title="class in org.apache.beam.sdk.io.gcp.spanner">SpannerIO.Write</a></span></code> |
| <div class="block">A <a href="../../../../../../../org/apache/beam/sdk/transforms/PTransform.html" title="class in org.apache.beam.sdk.transforms"><code>PTransform</code></a> that writes <a href="https://static.javadoc.io/com.google.cloud/google-cloud-spanner/1.6.0/com/google/cloud/spanner/Mutation.html?is-external=true" title="class or interface in com.google.cloud.spanner"><code>Mutation</code></a> objects to Google Cloud Spanner.</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/gcp/spanner/SpannerIO.WriteGrouped.html" title="class in org.apache.beam.sdk.io.gcp.spanner">SpannerIO.WriteGrouped</a></span></code> |
| <div class="block">Same as <a href="../../../../../../../org/apache/beam/sdk/io/gcp/spanner/SpannerIO.Write.html" title="class in org.apache.beam.sdk.io.gcp.spanner"><code>SpannerIO.Write</code></a> but supports grouped mutations.</div> |
| </td> |
| </tr> |
| </table> |
| </li> |
| </ul> |
| <!-- ========== METHOD SUMMARY =========== --> |
| <ul class="blockList"> |
| <li class="blockList"><a name="method.summary"> |
| <!-- --> |
| </a> |
| <h3>Method Summary</h3> |
| <table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="Method Summary table, listing methods, and an explanation"> |
| <caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd"> </span></span><span id="t1" class="tableTab"><span><a href="javascript:show(1);">Static Methods</a></span><span class="tabEnd"> </span></span><span id="t4" class="tableTab"><span><a href="javascript:show(8);">Concrete Methods</a></span><span class="tabEnd"> </span></span></caption> |
| <tr> |
| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colLast" scope="col">Method and Description</th> |
| </tr> |
| <tr id="i0" class="altColor"> |
| <td class="colFirst"><code>static <a href="../../../../../../../org/apache/beam/sdk/io/gcp/spanner/SpannerIO.CreateTransaction.html" title="class in org.apache.beam.sdk.io.gcp.spanner">SpannerIO.CreateTransaction</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/beam/sdk/io/gcp/spanner/SpannerIO.html#createTransaction--">createTransaction</a></span>()</code> |
| <div class="block">Returns a transform that creates a batch transaction.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>static <a href="../../../../../../../org/apache/beam/sdk/io/gcp/spanner/SpannerIO.Read.html" title="class in org.apache.beam.sdk.io.gcp.spanner">SpannerIO.Read</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/beam/sdk/io/gcp/spanner/SpannerIO.html#read--">read</a></span>()</code> |
| <div class="block">Creates an uninitialized instance of <a href="../../../../../../../org/apache/beam/sdk/io/gcp/spanner/SpannerIO.Read.html" title="class in org.apache.beam.sdk.io.gcp.spanner"><code>SpannerIO.Read</code></a>.</div> |
| </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>static <a href="../../../../../../../org/apache/beam/sdk/io/gcp/spanner/SpannerIO.ReadAll.html" title="class in org.apache.beam.sdk.io.gcp.spanner">SpannerIO.ReadAll</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/beam/sdk/io/gcp/spanner/SpannerIO.html#readAll--">readAll</a></span>()</code> |
| <div class="block">A <a href="../../../../../../../org/apache/beam/sdk/transforms/PTransform.html" title="class in org.apache.beam.sdk.transforms"><code>PTransform</code></a> that works like <a href="../../../../../../../org/apache/beam/sdk/io/gcp/spanner/SpannerIO.html#read--"><code>read()</code></a>, but executes read operations coming from a |
| <a href="../../../../../../../org/apache/beam/sdk/values/PCollection.html" title="class in org.apache.beam.sdk.values"><code>PCollection</code></a>.</div> |
| </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code>static <a href="../../../../../../../org/apache/beam/sdk/io/gcp/spanner/SpannerIO.Write.html" title="class in org.apache.beam.sdk.io.gcp.spanner">SpannerIO.Write</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/beam/sdk/io/gcp/spanner/SpannerIO.html#write--">write</a></span>()</code> |
| <div class="block">Creates an uninitialized instance of <a href="../../../../../../../org/apache/beam/sdk/io/gcp/spanner/SpannerIO.Write.html" title="class in org.apache.beam.sdk.io.gcp.spanner"><code>SpannerIO.Write</code></a>.</div> |
| </td> |
| </tr> |
| </table> |
| <ul class="blockList"> |
| <li class="blockList"><a name="methods.inherited.from.class.java.lang.Object"> |
| <!-- --> |
| </a> |
| <h3>Methods inherited from class java.lang.Object</h3> |
| <code>clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</code></li> |
| </ul> |
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| <h3>Method Detail</h3> |
| <a name="read--"> |
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| <h4>read</h4> |
| <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 static <a href="../../../../../../../org/apache/beam/sdk/io/gcp/spanner/SpannerIO.Read.html" title="class in org.apache.beam.sdk.io.gcp.spanner">SpannerIO.Read</a> read()</pre> |
| <div class="block">Creates an uninitialized instance of <a href="../../../../../../../org/apache/beam/sdk/io/gcp/spanner/SpannerIO.Read.html" title="class in org.apache.beam.sdk.io.gcp.spanner"><code>SpannerIO.Read</code></a>. Before use, the <a href="../../../../../../../org/apache/beam/sdk/io/gcp/spanner/SpannerIO.Read.html" title="class in org.apache.beam.sdk.io.gcp.spanner"><code>SpannerIO.Read</code></a> must be |
| configured with a <a href="../../../../../../../org/apache/beam/sdk/io/gcp/spanner/SpannerIO.Read.html#withInstanceId-java.lang.String-"><code>SpannerIO.Read.withInstanceId(java.lang.String)</code></a> and <a href="../../../../../../../org/apache/beam/sdk/io/gcp/spanner/SpannerIO.Read.html#withDatabaseId-java.lang.String-"><code>SpannerIO.Read.withDatabaseId(java.lang.String)</code></a> that identify the |
| Cloud Spanner database.</div> |
| </li> |
| </ul> |
| <a name="readAll--"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>readAll</h4> |
| <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 static <a href="../../../../../../../org/apache/beam/sdk/io/gcp/spanner/SpannerIO.ReadAll.html" title="class in org.apache.beam.sdk.io.gcp.spanner">SpannerIO.ReadAll</a> readAll()</pre> |
| <div class="block">A <a href="../../../../../../../org/apache/beam/sdk/transforms/PTransform.html" title="class in org.apache.beam.sdk.transforms"><code>PTransform</code></a> that works like <a href="../../../../../../../org/apache/beam/sdk/io/gcp/spanner/SpannerIO.html#read--"><code>read()</code></a>, but executes read operations coming from a |
| <a href="../../../../../../../org/apache/beam/sdk/values/PCollection.html" title="class in org.apache.beam.sdk.values"><code>PCollection</code></a>.</div> |
| </li> |
| </ul> |
| <a name="createTransaction--"> |
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| <ul class="blockList"> |
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| <h4>createTransaction</h4> |
| <pre><a href="../../../../../../../org/apache/beam/sdk/annotations/Experimental.html" title="annotation in org.apache.beam.sdk.annotations">@Experimental</a> |
| public static <a href="../../../../../../../org/apache/beam/sdk/io/gcp/spanner/SpannerIO.CreateTransaction.html" title="class in org.apache.beam.sdk.io.gcp.spanner">SpannerIO.CreateTransaction</a> createTransaction()</pre> |
| <div class="block">Returns a transform that creates a batch transaction. By default, <a href="https://static.javadoc.io/com.google.cloud/google-cloud-spanner/1.6.0/com/google/cloud/spanner/TimestampBound.html?is-external=true#strong--" title="class or interface in com.google.cloud.spanner"><code>TimestampBound.strong()</code></a> transaction is created, to override this use <a href="../../../../../../../org/apache/beam/sdk/io/gcp/spanner/SpannerIO.CreateTransaction.html#withTimestampBound-com.google.cloud.spanner.TimestampBound-"><code>SpannerIO.CreateTransaction.withTimestampBound(TimestampBound)</code></a>.</div> |
| </li> |
| </ul> |
| <a name="write--"> |
| <!-- --> |
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| <h4>write</h4> |
| <pre><a href="../../../../../../../org/apache/beam/sdk/annotations/Experimental.html" title="annotation in org.apache.beam.sdk.annotations">@Experimental</a> |
| public static <a href="../../../../../../../org/apache/beam/sdk/io/gcp/spanner/SpannerIO.Write.html" title="class in org.apache.beam.sdk.io.gcp.spanner">SpannerIO.Write</a> write()</pre> |
| <div class="block">Creates an uninitialized instance of <a href="../../../../../../../org/apache/beam/sdk/io/gcp/spanner/SpannerIO.Write.html" title="class in org.apache.beam.sdk.io.gcp.spanner"><code>SpannerIO.Write</code></a>. Before use, the <a href="../../../../../../../org/apache/beam/sdk/io/gcp/spanner/SpannerIO.Write.html" title="class in org.apache.beam.sdk.io.gcp.spanner"><code>SpannerIO.Write</code></a> must be |
| configured with a <a href="../../../../../../../org/apache/beam/sdk/io/gcp/spanner/SpannerIO.Write.html#withInstanceId-java.lang.String-"><code>SpannerIO.Write.withInstanceId(java.lang.String)</code></a> and <a href="../../../../../../../org/apache/beam/sdk/io/gcp/spanner/SpannerIO.Write.html#withDatabaseId-java.lang.String-"><code>SpannerIO.Write.withDatabaseId(java.lang.String)</code></a> that identify |
| the Cloud Spanner database being written.</div> |
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