Hi James,
the method `Table.writeToSink()` calls `configure(String[] fieldNames,
TypeInformation<?>[] fieldTypes)` internally. Since you return null, you
are trying to register null instead of a table sink.
I hope this helps.
Regards,
Timo
Am 23.07.18 um 14:33 schrieb Porritt, James:
I put this class together when trying to create my own upsertable
table sink in Java:
public class MyTableSink implements UpsertStreamTableSink<Row> {
@Override
public TableSink<Tuple2<Boolean, Row>> configure(String[] fieldNames,
TypeInformation<?>[] fieldTypes) {
return null;
}
@Override
public void setKeyFields(String[] keys) {
System.out.println("setKeyFields" + keys);
}
@Override
public void setIsAppendOnly(Boolean isAppendOnly) {
}
@Override
public String[] getFieldNames() {
return new String[0];
}
@Override
public TypeInformation<?>[] getFieldTypes() {
return new TypeInformation[0];
}
@Override
public TypeInformation<Row> getRecordType() {
return null;
}
@Override
public TupleTypeInfo<Tuple2<Boolean, Row>> getOutputType() {
return new TupleTypeInfo<Tuple2<Boolean, Row>>();
}
@Override
public void emitDataStream(DataStream<Tuple2<Boolean, Row>> dataStream) {
dataStream.print();
}
}
I try and link it to my StreamTable with:
mystreamtable.writeToSink(new MyTableSink());
For some reason though I’m getting the error:
org.apache.flink.client.program.ProgramInvocationException: The main
method caused an error.
at
org.apache.flink.client.program.PackagedProgram.callMainMethod(PackagedProgram.java:545)
at
org.apache.flink.client.program.PackagedProgram.invokeInteractiveModeForExecution(PackagedProgram.java:420)
at
org.apache.flink.client.program.ClusterClient.run(ClusterClient.java:404)
at
org.apache.flink.client.cli.CliFrontend.executeProgram(CliFrontend.java:781)
at
org.apache.flink.client.cli.CliFrontend.runProgram(CliFrontend.java:275)
at org.apache.flink.client.cli.CliFrontend.run(CliFrontend.java:210)
at
org.apache.flink.client.cli.CliFrontend.parseParameters(CliFrontend.java:1020)
at
org.apache.flink.client.cli.CliFrontend.lambda$main$9(CliFrontend.java:1096)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:422)
at
org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1754)
at
org.apache.flink.runtime.security.HadoopSecurityContext.runSecured(HadoopSecurityContext.java:41)
at org.apache.flink.client.cli.CliFrontend.main(CliFrontend.java:1096)
Caused by: org.apache.flink.table.api.TableException: Stream Tables
can only be emitted by AppendStreamTableSink, RetractStreamTableSink,
or UpsertStreamTableSink.
at
org.apache.flink.table.api.StreamTableEnvironment.writeToSink(StreamTableEnvironment.scala:284)
at org.apache.flink.table.api.Table.writeToSink(table.scala:862)
at org.apache.flink.table.api.Table.writeToSink(table.scala:830)
at alphagen_stats.KafkaAlphaGen.main(KafkaAlphaGen.java:265)
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.apache.flink.client.program.PackagedProgram.callMainMethod(PackagedProgram.java:528)
... 12 more
What am I doing wrong?
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