我正在研究Cloud Data Fusion POC，并且正在尝试创建MSSQL到BigQuery管道。由于我可以从查询导入架构，因此该连接有效，但是，我得到了MapReduce Program "phase-1" failed和java.lang.NullPointerException: null exception
我已经尝试使用通用数据库源和接收器，如该问题Getting Null Pointer Exception when mapping SQL Server Database to MySQL Database with MapReduce所述，导入查询也已经指定。
这是完整的堆栈跟踪
java.lang.NullPointerException: null
at com.google.common.base.Preconditions.checkNotNull(Preconditions.java:770) ~[com.google.guava.guava-13.0.1.jar:na]
at com.google.common.collect.Lists$TransformingSequentialList.<init>(Lists.java:569) ~[com.google.guava.guava-13.0.1.jar:na]
at com.google.common.collect.Lists.transform(Lists.java:553) ~[com.google.guava.guava-13.0.1.jar:na]
at com.google.cloud.bigquery.FieldList.fromPb(FieldList.java:116) ~[na:na]
at com.google.cloud.bigquery.Schema.fromPb(Schema.java:107) ~[na:na]
at com.google.cloud.bigquery.TableDefinition$Builder.table(TableDefinition.java:120) ~[na:na]
at com.google.cloud.bigquery.StandardTableDefinition.fromPb(StandardTableDefinition.java:220) ~[na:na]
at com.google.cloud.bigquery.TableDefinition.fromPb(TableDefinition.java:155) ~[na:na]
at com.google.cloud.bigquery.TableInfo$BuilderImpl.<init>(TableInfo.java:183) ~[na:na]
at com.google.cloud.bigquery.Table.fromPb(Table.java:603) ~[na:na]
at com.google.cloud.bigquery.BigQueryImpl.getTable(BigQueryImpl.java:415) ~[na:na]
at io.cdap.plugin.gcp.bigquery.util.BigQueryUtil.getBigQueryTable(BigQueryUtil.java:131) ~[na:na]
at io.cdap.plugin.gcp.bigquery.sink.AbstractBigQuerySink.validateSchema(AbstractBigQuerySink.java:291) ~[na:na]
at io.cdap.plugin.gcp.bigquery.sink.AbstractBigQuerySink.initOutput(AbstractBigQuerySink.java:119) ~[na:na]
at io.cdap.plugin.gcp.bigquery.sink.BigQuerySink.prepareRunInternal(BigQuerySink.java:80) ~[na:na]
at io.cdap.plugin.gcp.bigquery.sink.AbstractBigQuerySink.prepareRun(AbstractBigQuerySink.java:88) ~[na:na]
at io.cdap.plugin.gcp.bigquery.sink.AbstractBigQuerySink.prepareRun(AbstractBigQuerySink.java:57) ~[na:na]
at io.cdap.cdap.etl.common.plugin.WrappedBatchSink.lambda$prepareRun$0(WrappedBatchSink.java:52) ~[na:na]
at io.cdap.cdap.etl.common.plugin.Caller$1.call(Caller.java:30) ~[na:na]
at io.cdap.cdap.etl.common.plugin.StageLoggingCaller.call(StageLoggingCaller.java:40) ~[na:na]
at io.cdap.cdap.etl.common.plugin.WrappedBatchSink.prepareRun(WrappedBatchSink.java:51) ~[na:na]
at io.cdap.cdap.etl.common.plugin.WrappedBatchSink.prepareRun(WrappedBatchSink.java:37) ~[na:na]
at io.cdap.cdap.etl.common.submit.SubmitterPlugin.lambda$prepareRun$2(SubmitterPlugin.java:71) ~[na:na]
at io.cdap.cdap.internal.app.runtime.AbstractContext$2.run(AbstractContext.java:551) ~[na:na]
at io.cdap.cdap.data2.transaction.Transactions$CacheBasedTransactional.finishExecute(Transactions.java:224) ~[na:na]
at io.cdap.cdap.data2.transaction.Transactions$CacheBasedTransactional.execute(Transactions.java:211) ~[na:na]
at io.cdap.cdap.internal.app.runtime.AbstractContext.execute(AbstractContext.java:546) ~[na:na]
at io.cdap.cdap.internal.app.runtime.AbstractContext.execute(AbstractContext.java:534) ~[na:na]
at io.cdap.cdap.etl.common.submit.SubmitterPlugin.prepareRun(SubmitterPlugin.java:69) ~[na:na]
at io.cdap.cdap.etl.batch.PipelinePhasePreparer.prepare(PipelinePhasePreparer.java:111) ~[na:na]
at io.cdap.cdap.etl.batch.mapreduce.MapReducePreparer.prepare(MapReducePreparer.java:97) ~[na:na]
at io.cdap.cdap.etl.batch.mapreduce.ETLMapReduce.initialize(ETLMapReduce.java:192) ~[na:na]
at io.cdap.cdap.api.mapreduce.AbstractMapReduce.initialize(AbstractMapReduce.java:109) ~[na:na]
at io.cdap.cdap.api.mapreduce.AbstractMapReduce.initialize(AbstractMapReduce.java:32) ~[na:na]
at io.cdap.cdap.internal.app.runtime.batch.MapReduceRuntimeService$1.initialize(MapReduceRuntimeService.java:182) ~[na:na]
at io.cdap.cdap.internal.app.runtime.batch.MapReduceRuntimeService$1.initialize(MapReduceRuntimeService.java:177) ~[na:na]
at io.cdap.cdap.internal.app.runtime.AbstractContext.lambda$initializeProgram$1(AbstractContext.java:640) ~[na:na]
at io.cdap.cdap.internal.app.runtime.AbstractContext.execute(AbstractContext.java:600) ~[na:na]
at io.cdap.cdap.internal.app.runtime.AbstractContext.initializeProgram(AbstractContext.java:637) ~[na:na]
at io.cdap.cdap.internal.app.runtime.batch.MapReduceRuntimeService.beforeSubmit(MapReduceRuntimeService.java:547) ~[na:na]
at io.cdap.cdap.internal.app.runtime.batch.MapReduceRuntimeService.startUp(MapReduceRuntimeService.java:226) ~[na:na]
at com.google.common.util.concurrent.AbstractExecutionThreadService$1$1.run(AbstractExecutionThreadService.java:47) ~[com.google.guava.guava-13.0.1.jar:na]
at io.cdap.cdap.internal.app.runtime.batch.MapReduceRuntimeService$2$1.run(MapReduceRuntimeService.java:450) [na:na]
at java.lang.Thread.run(Thread.java:748) [na:1.8.0_212]
答案 0 :(得分：0)
您可以尝试删除目标数据集并让管道自动创建它吗？我怀疑管道正在尝试写入没有字段的数据集。