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A schema transform implementation for SpannerIO.Write (apache#24278)
* A schema transform implementation for SpannerIO.Write * fixup * fixup * fixup * fixup * fixup and comments * fixup * fixup
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...src/main/java/org/apache/beam/sdk/io/gcp/spanner/SpannerWriteSchemaTransformProvider.java
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| /* | ||
| * Licensed to the Apache Software Foundation (ASF) under one | ||
| * or more contributor license agreements. See the NOTICE file | ||
| * distributed with this work for additional information | ||
| * regarding copyright ownership. The ASF licenses this file | ||
| * to you under the Apache License, Version 2.0 (the | ||
| * "License"); you may not use this file except in compliance | ||
| * with the License. You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
| package org.apache.beam.sdk.io.gcp.spanner; | ||
|
|
||
| import com.google.auto.service.AutoService; | ||
| import com.google.auto.value.AutoValue; | ||
| import com.google.cloud.spanner.Mutation; | ||
| import java.io.Serializable; | ||
| import java.util.Collections; | ||
| import java.util.List; | ||
| import java.util.Objects; | ||
| import java.util.stream.Collectors; | ||
| import org.apache.beam.sdk.schemas.AutoValueSchema; | ||
| import org.apache.beam.sdk.schemas.Schema; | ||
| import org.apache.beam.sdk.schemas.annotations.DefaultSchema; | ||
| import org.apache.beam.sdk.schemas.transforms.SchemaTransform; | ||
| import org.apache.beam.sdk.schemas.transforms.SchemaTransformProvider; | ||
| import org.apache.beam.sdk.schemas.transforms.TypedSchemaTransformProvider; | ||
| import org.apache.beam.sdk.transforms.FlatMapElements; | ||
| import org.apache.beam.sdk.transforms.MapElements; | ||
| import org.apache.beam.sdk.transforms.PTransform; | ||
| import org.apache.beam.sdk.transforms.SimpleFunction; | ||
| import org.apache.beam.sdk.values.PCollection; | ||
| import org.apache.beam.sdk.values.PCollectionRowTuple; | ||
| import org.apache.beam.sdk.values.Row; | ||
| import org.apache.beam.sdk.values.TypeDescriptors; | ||
| import org.apache.beam.vendor.guava.v26_0_jre.com.google.common.collect.Iterators; | ||
| import org.checkerframework.checker.initialization.qual.Initialized; | ||
| import org.checkerframework.checker.nullness.qual.NonNull; | ||
| import org.checkerframework.checker.nullness.qual.UnknownKeyFor; | ||
|
|
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| @AutoService(SchemaTransformProvider.class) | ||
| public class SpannerWriteSchemaTransformProvider | ||
| extends TypedSchemaTransformProvider< | ||
| SpannerWriteSchemaTransformProvider.SpannerWriteSchemaTransformConfiguration> { | ||
|
|
||
| @Override | ||
| protected @UnknownKeyFor @NonNull @Initialized Class<SpannerWriteSchemaTransformConfiguration> | ||
| configurationClass() { | ||
| return SpannerWriteSchemaTransformConfiguration.class; | ||
| } | ||
|
|
||
| @Override | ||
| protected @UnknownKeyFor @NonNull @Initialized SchemaTransform from( | ||
| SpannerWriteSchemaTransformConfiguration configuration) { | ||
| return new SpannerSchemaTransformWrite(configuration); | ||
| } | ||
|
|
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| static class SpannerSchemaTransformWrite implements SchemaTransform, Serializable { | ||
| private final SpannerWriteSchemaTransformConfiguration configuration; | ||
|
|
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| SpannerSchemaTransformWrite(SpannerWriteSchemaTransformConfiguration configuration) { | ||
| this.configuration = configuration; | ||
| } | ||
|
|
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| @Override | ||
| public @UnknownKeyFor @NonNull @Initialized PTransform< | ||
| @UnknownKeyFor @NonNull @Initialized PCollectionRowTuple, | ||
| @UnknownKeyFor @NonNull @Initialized PCollectionRowTuple> | ||
| buildTransform() { | ||
| // TODO: For now we are allowing ourselves to fail at runtime, but we could | ||
| // perform validations here at expansion time. This TODO is to add a few | ||
| // validations (e.g. table/database/instance existence, schema match, etc). | ||
| return new PTransform<@NonNull PCollectionRowTuple, @NonNull PCollectionRowTuple>() { | ||
| @Override | ||
| public PCollectionRowTuple expand(@NonNull PCollectionRowTuple input) { | ||
| SpannerWriteResult result = | ||
| input | ||
| .get("input") | ||
| .apply( | ||
| MapElements.via( | ||
| new SimpleFunction<Row, Mutation>( | ||
| row -> | ||
| MutationUtils.createMutationFromBeamRows( | ||
| Mutation.newInsertOrUpdateBuilder(configuration.getTableId()), | ||
| Objects.requireNonNull(row))) {})) | ||
| .apply( | ||
| SpannerIO.write() | ||
| .withDatabaseId(configuration.getDatabaseId()) | ||
| .withInstanceId(configuration.getInstanceId()) | ||
| .withFailureMode(SpannerIO.FailureMode.REPORT_FAILURES)); | ||
| Schema failureSchema = | ||
| Schema.builder() | ||
| .addStringField("operation") | ||
| .addStringField("instanceId") | ||
| .addStringField("databaseId") | ||
| .addStringField("tableId") | ||
| .addStringField("mutationData") | ||
| .build(); | ||
| PCollection<Row> failures = | ||
| result | ||
| .getFailedMutations() | ||
| .apply( | ||
| FlatMapElements.into(TypeDescriptors.rows()) | ||
| .via( | ||
| mtg -> | ||
| Objects.requireNonNull(mtg).attached().stream() | ||
| .map( | ||
| mutation -> | ||
| Row.withSchema(failureSchema) | ||
| .addValue(mutation.getOperation().toString()) | ||
| .addValue(configuration.getInstanceId()) | ||
| .addValue(configuration.getDatabaseId()) | ||
| .addValue(mutation.getTable()) | ||
| // TODO(pabloem): Figure out how to represent | ||
| // mutation | ||
| // contents in DLQ | ||
| .addValue( | ||
| Iterators.toString( | ||
| mutation.getValues().iterator())) | ||
| .build()) | ||
| .collect(Collectors.toList()))) | ||
| .setRowSchema(failureSchema); | ||
| return PCollectionRowTuple.of("failures", failures); | ||
| } | ||
| }; | ||
| } | ||
| } | ||
|
|
||
| @Override | ||
| public @UnknownKeyFor @NonNull @Initialized String identifier() { | ||
| return "beam:schematransform:org.apache.beam:spanner_write:v1"; | ||
| } | ||
|
|
||
| @Override | ||
| public @UnknownKeyFor @NonNull @Initialized List<@UnknownKeyFor @NonNull @Initialized String> | ||
| inputCollectionNames() { | ||
| return Collections.singletonList("input"); | ||
| } | ||
|
|
||
| @Override | ||
| public @UnknownKeyFor @NonNull @Initialized List<@UnknownKeyFor @NonNull @Initialized String> | ||
| outputCollectionNames() { | ||
| return Collections.singletonList("failures"); | ||
| } | ||
|
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| @AutoValue | ||
| @DefaultSchema(AutoValueSchema.class) | ||
| public abstract static class SpannerWriteSchemaTransformConfiguration implements Serializable { | ||
| public abstract String getInstanceId(); | ||
|
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| public abstract String getDatabaseId(); | ||
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| public abstract String getTableId(); | ||
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| public static Builder builder() { | ||
| return new AutoValue_SpannerWriteSchemaTransformProvider_SpannerWriteSchemaTransformConfiguration | ||
| .Builder(); | ||
| } | ||
|
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| @AutoValue.Builder | ||
| public abstract static class Builder { | ||
| public abstract Builder setInstanceId(String instanceId); | ||
|
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| public abstract Builder setDatabaseId(String databaseId); | ||
|
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| public abstract Builder setTableId(String tableId); | ||
|
|
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| public abstract SpannerWriteSchemaTransformConfiguration build(); | ||
| } | ||
| } | ||
| } |
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