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[fix][io][branch-2.10] Not restart instance when kafka source poll ex…
…ception.
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pulsar-io/kafka/src/main/java/org/apache/pulsar/io/kafka/KafkaPushSource.java
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| @@ -0,0 +1,108 @@ | ||
| /** | ||
| * 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.pulsar.io.kafka; | ||
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|
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| import java.util.concurrent.LinkedBlockingQueue; | ||
| import org.apache.pulsar.functions.api.Record; | ||
| import org.apache.pulsar.io.core.Source; | ||
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|
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| /** | ||
| * Kafka Push Source. | ||
| * To maintain compatibility, we can't pick the PIP-281: https://github.com/apache/pulsar/pull/20807 | ||
| * cherry-pick to the historical version, so the class is implemented in the kafka connector. | ||
| */ | ||
| public abstract class KafkaPushSource<T> implements Source<T> { | ||
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| private static class NullRecord implements Record { | ||
| @Override | ||
| public Object getValue() { | ||
| return null; | ||
| } | ||
| } | ||
|
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| private static class ErrorNotifierRecord implements Record { | ||
| private Exception e; | ||
| public ErrorNotifierRecord(Exception e) { | ||
| this.e = e; | ||
| } | ||
| @Override | ||
| public Object getValue() { | ||
| return null; | ||
| } | ||
|
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| public Exception getException() { | ||
| return e; | ||
| } | ||
| } | ||
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| private LinkedBlockingQueue<Record<T>> queue; | ||
| private static final int DEFAULT_QUEUE_LENGTH = 1000; | ||
| private final NullRecord nullRecord = new NullRecord(); | ||
|
|
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| public KafkaPushSource() { | ||
| this.queue = new LinkedBlockingQueue<>(this.getQueueLength()); | ||
| } | ||
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| @Override | ||
| public Record<T> read() throws Exception { | ||
| Record<T> record = queue.take(); | ||
| if (record instanceof ErrorNotifierRecord) { | ||
| throw ((ErrorNotifierRecord) record).getException(); | ||
| } | ||
| if (record instanceof NullRecord) { | ||
| return null; | ||
| } else { | ||
| return record; | ||
| } | ||
| } | ||
|
|
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| /** | ||
| * Send this message to be written to Pulsar. | ||
| * Pass null if you you are done with this task | ||
| * @param record next message from source which should be sent to a Pulsar topic | ||
| */ | ||
| public void consume(Record<T> record) { | ||
| try { | ||
| if (record != null) { | ||
| queue.put(record); | ||
| } else { | ||
| queue.put(nullRecord); | ||
| } | ||
| } catch (InterruptedException e) { | ||
| throw new RuntimeException(e); | ||
| } | ||
| } | ||
|
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| /** | ||
| * Get length of the queue that records are push onto. | ||
| * Users can override this method to customize the queue length | ||
| * @return queue length | ||
| */ | ||
| public int getQueueLength() { | ||
| return DEFAULT_QUEUE_LENGTH; | ||
| } | ||
|
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| /** | ||
| * Allows the source to notify errors asynchronously. | ||
| * @param ex | ||
| */ | ||
| public void notifyError(Exception ex) { | ||
| consume(new ErrorNotifierRecord(ex)); | ||
| } | ||
| } |
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