写入 BigQuery 时出现 MojoExecutionException
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【中文标题】写入 BigQuery 时出现 MojoExecutionException【英文标题】：MojoExecutionException while writing to BigQuery 【发布时间】：2017-09-11 12:26:26 【问题描述】：我对 GCP 比较陌生，并尝试亲身体验 Google Cloud 上提供的不同服务。
在使用 Bigquery 尝试数据流 (Beam) 时，我遇到了一个异常，我无法从显示的错误中找到任何信息。 对此的任何帮助将不胜感激。
上下文：
我正在尝试运行一个数据流管道，该管道将从数据存储中读取全部数据，然后将其写入 Bigquery。
代码
import com.google.api.services.bigquery.model.TableFieldSchema;
import com.google.api.services.bigquery.model.TableRow;
import com.google.api.services.bigquery.model.TableSchema;
import com.google.datastore.v1.Entity;
import com.google.datastore.v1.Query;
import com.google.datastore.v1.Value;
import org.apache.beam.sdk.Pipeline;
import org.apache.beam.sdk.io.gcp.bigquery.BigQueryIO;
import org.apache.beam.sdk.io.gcp.datastore.DatastoreIO;
import org.apache.beam.sdk.options.*;
import org.apache.beam.sdk.transforms.DoFn;
import org.apache.beam.sdk.transforms.ParDo;
import org.druk.twc.tods.ToDatastore;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import static com.google.datastore.v1.client.DatastoreHelper.getString;
public class DsToBQ
private static final Logger LOG = LoggerFactory.getLogger(ToDatastore.class);
static class GetContentFn extends DoFn<Entity, String>
private static final long serialVersionUID = 0;
@ProcessElement
public void processElement(ProcessContext c)
Map<String, Value> props = c.element().getPropertiesMap();
Value value = props.get("content");
if (value != null)
c.output(getString(value));
static class ToTableRowFn extends DoFn<String, TableRow>
private static final long serialVersionUID = 0;
@ProcessElement
public void processElement(ProcessContext c)
TableRow row = new TableRow()
.set("number", Integer.parseInt(c.element()));
c.output(row);
public static interface Options extends PipelineOptions
@Description("Dataset entity kind")
@Default.String("pos")
String getKind();
void setKind(String value);
@Description("Table location in formate: YOUR_PROJECT_ID:DATASET_ID.TABLE_ID")
@Validation.Required
String getTable();
void setTable(String table);
public static void main(String args[])
//Register all the custom option
PipelineOptionsFactory.register(Options.class);
//Create pipeline options
Options option = PipelineOptionsFactory.fromArgs(args).withValidation().as(Options.class);
// Build a query:
Query.Builder q = Query.newBuilder();
// read all entities of the specified kind.
q.addKindBuilder().setName(option.getKind());
Query query = q.build();
// Build the table schema for the output table.
List<TableFieldSchema> fields = new ArrayList<>();
fields.add(new TableFieldSchema().setName("number").setType("INTEGER"));
TableSchema schema = new TableSchema().setFields(fields);
Pipeline p = Pipeline.create(option);
p
.apply("Read From Datastore", DatastoreIO.v1().read().withQuery(query))
.apply("Multiply with 3", ParDo.of(new GetContentFn()))
.apply("Convert to Table row", ParDo.of(new ToTableRowFn()))
.apply("Write for BQ", BigQueryIO.writeTableRows()
.to(option.getTable())
.withSchema(schema));
p.run();
错误
[ERROR] Failed to execute goal org.codehaus.mojo:exec-maven-plugin:1.4.0:java (default-cli) on project pubsub-bigquery: An exception occured while executing the Java class. null: InvocationTargetException: projectId -> [Help 1]
org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal org.codehaus.mojo:exec-maven-plugin:1.4.0:java (default-cli) on project pubsub-bigquery: An exception occured while executing the Java class. null
at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:212)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:153)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145)
at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:116)
at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:80)
at org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build(SingleThreadedBuilder.java:51)
at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:128)
at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:307)
at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:193)
at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:106)
at org.apache.maven.cli.MavenCli.execute(MavenCli.java:863)
at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:288)
at org.apache.maven.cli.MavenCli.main(MavenCli.java:199)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:289)
at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:229)
at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:415)
at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:356)
Caused by: org.apache.maven.plugin.MojoExecutionException: An exception occured while executing the Java class. null
at org.codehaus.mojo.exec.ExecJavaMojo.execute(ExecJavaMojo.java:345)
at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:134)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:207)
... 20 more
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.codehaus.mojo.exec.ExecJavaMojo$1.run(ExecJavaMojo.java:293)
at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.NullPointerException: projectId
at com.google.common.base.Preconditions.checkNotNull(Preconditions.java:787)
at org.apache.beam.sdk.io.gcp.datastore.DatastoreV1$Read.validate(DatastoreV1.java:624)
at org.apache.beam.sdk.Pipeline$ValidateVisitor.enterCompositeTransform(Pipeline.java:610)
at org.apache.beam.sdk.runners.TransformHierarchy$Node.visit(TransformHierarchy.java:590)
at org.apache.beam.sdk.runners.TransformHierarchy$Node.visit(TransformHierarchy.java:594)
at org.apache.beam.sdk.runners.TransformHierarchy$Node.access$500(TransformHierarchy.java:276)
at org.apache.beam.sdk.runners.TransformHierarchy.visit(TransformHierarchy.java:210)
at org.apache.beam.sdk.Pipeline.traverseTopologically(Pipeline.java:440)
at org.apache.beam.sdk.Pipeline.validate(Pipeline.java:552)
at org.apache.beam.sdk.Pipeline.run(Pipeline.java:296)
at org.apache.beam.sdk.Pipeline.run(Pipeline.java:283)
at org.druk.twc.tobq.DsToBQ.main(DsToBQ.java:126)
... 6 more
[ERROR]
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoExecutionException
执行命令
mvn compile exec:java -Dexec.mainClass=<Class Name>
-Dexec.args="--runner=DataflowRunner \
--project=<Project ID> --kind=<Kind Name> \
--gcpTempLocation=gs://<To temp Location> \
--table=<Project ID>:<Dataset ID>.<Table ID>" -Pdataflow-runner
【问题讨论】：
【参考方案1】：从错误中，我看到它无法检索要从 Datastore 读取的项目。在您的 Pipeline 配置中，您必须使用以下命令指定 Datastore 项目：
p
.apply("Read From Datastore", DatastoreIO.v1().read()
.withProject("..")
.withQuery(query))
我已打开 JIRA 问题 BEAM-2883 以改进此错误消息。
【讨论】：
谢谢，斯科特！这行得通。我的印象是它会自动从数据存储中获取 projectID。以上是关于写入 BigQuery 时出现 MojoExecutionException的主要内容，如果未能解决你的问题，请参考以下文章
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