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DeadLetterSink.java
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DeadLetterSink.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 com.google.dataflow.sample.retail.businesslogic.core.transforms;
import com.google.dataflow.sample.retail.businesslogic.core.DeploymentAnnotations.NoPartialResultsOnDrain;
import com.google.dataflow.sample.retail.businesslogic.core.options.RetailPipelineOptions;
import com.google.dataflow.sample.retail.businesslogic.core.options.RetailPipelineReportingOptions;
import org.apache.beam.sdk.annotations.Experimental;
import org.apache.beam.sdk.io.gcp.bigquery.BigQueryIO;
import org.apache.beam.sdk.io.gcp.bigquery.BigQueryIO.Write.CreateDisposition;
import org.apache.beam.sdk.io.gcp.bigquery.BigQueryIO.Write.WriteDisposition;
import org.apache.beam.sdk.transforms.MapElements;
import org.apache.beam.sdk.transforms.PTransform;
import org.apache.beam.sdk.values.PCollection;
import org.apache.beam.sdk.values.PDone;
import org.apache.beam.sdk.values.TypeDescriptor;
import org.apache.beam.sdk.values.TypeDescriptors;
import org.joda.time.Instant;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Output Raw Error Messages to DeadLetter sinks.
*
* <p>Log {@link SinkType#LOG} output and BigQuery {@link SinkType#BIGQUERY} are currently
* supported.
*
* <p>--BigQuery Sink
*
* <p>Errors are sent to {@link RetailPipelineReportingOptions#getDeadLetterTable()}
*/
@NoPartialResultsOnDrain
@Experimental
public class DeadLetterSink extends PTransform<PCollection<ErrorMsg>, PDone> {
private static final Logger LOG = LoggerFactory.getLogger(DeadLetterSink.class);
// Enum which defines the sink type for DeadLetter sink.
public enum SinkType {
BIGQUERY,
LOG
}
private SinkType sinkType;
private static final Instant MAX_DATE = Instant.parse("9999-12-31");
private static final Instant MIN_DATE = Instant.parse("0001-01-01");
// Hide default constructor
private DeadLetterSink() {};
public static DeadLetterSink createSink(SinkType type) {
switch (type) {
case BIGQUERY:
{
return createBigQuerySink();
}
case LOG:
{
return createLogSink();
}
}
throw new IllegalArgumentException("Type can not be null");
}
private static DeadLetterSink createBigQuerySink() {
DeadLetterSink sink = new DeadLetterSink();
sink.sinkType = SinkType.BIGQUERY;
return sink;
}
private static DeadLetterSink createLogSink() {
DeadLetterSink sink = new DeadLetterSink();
sink.sinkType = SinkType.LOG;
return sink;
}
@Override
public PDone expand(PCollection<ErrorMsg> input) {
RetailPipelineOptions options =
input.getPipeline().getOptions().as(RetailPipelineOptions.class);
if (sinkType.equals(SinkType.BIGQUERY) && !options.getTestModeEnabled()) {
String table =
String.format(
"%s:%s", options.getDataWarehouseOutputProject(), options.getDeadLetterTable());
// BigQuery does not support Timestamps outside of 0001 to 9999 range. We move to Max.
// Values larger than 9999 are possible if the elements are in a Global Window.
// TODO Protect from NPE
input
.apply(
MapElements.into(TypeDescriptor.of(ErrorMsg.class))
.via(
x ->
x.toBuilder()
.setTimestamp(
(x.getTimestamp() == null
|| x.getTimestamp().isAfter(MAX_DATE)
|| x.getTimestamp().isBefore(MIN_DATE))
? MAX_DATE
: x.getTimestamp())
.build()))
.apply(
BigQueryIO.<ErrorMsg>write()
.withWriteDisposition(WriteDisposition.WRITE_APPEND)
.withCreateDisposition(CreateDisposition.CREATE_IF_NEEDED)
.to(table)
.useBeamSchema());
}
if (sinkType.equals(SinkType.LOG) || options.getTestModeEnabled()) {
input.apply(
MapElements.into(TypeDescriptors.strings())
.via(
x -> {
LOG.info(
String.format(
"%s failed with %s at %s in %s",
x.getData(), x.getError(), x.getTimestamp(), x.getTransform()));
return "";
}));
}
return PDone.in(input.getPipeline());
}
}