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将消费者从 KCL 1.x 迁移到 KCL 2.x

本主题解释了 Kinesis 客户端库 1.x 和 2.x 版本之间的区别 ()。KCL它还向您展示了如何将消费者从 1.x 版迁移到 2.x 版。KCL在迁移您的客户端后，它将从最后一个检查点位置开始处理记录。

2.0 版KCL引入了以下界面更改：

迁移记录处理器

以下示例显示了为 KCL 1.x 实现的记录处理器：

package com.amazonaws.kcl;

import com.amazonaws.services.kinesis.clientlibrary.exceptions.InvalidStateException;
import com.amazonaws.services.kinesis.clientlibrary.exceptions.ShutdownException;
import com.amazonaws.services.kinesis.clientlibrary.interfaces.IRecordProcessorCheckpointer;
import com.amazonaws.services.kinesis.clientlibrary.interfaces.v2.IRecordProcessor;
import com.amazonaws.services.kinesis.clientlibrary.interfaces.v2.IShutdownNotificationAware;
import com.amazonaws.services.kinesis.clientlibrary.lib.worker.ShutdownReason;
import com.amazonaws.services.kinesis.clientlibrary.types.InitializationInput;
import com.amazonaws.services.kinesis.clientlibrary.types.ProcessRecordsInput;
import com.amazonaws.services.kinesis.clientlibrary.types.ShutdownInput;

public class TestRecordProcessor implements IRecordProcessor, IShutdownNotificationAware {
    @Override
    public void initialize(InitializationInput initializationInput) {
        //
        // Setup record processor
        //
    }

    @Override
    public void processRecords(ProcessRecordsInput processRecordsInput) {
        //
        // Process records, and possibly checkpoint
        //
    }

    @Override
    public void shutdown(ShutdownInput shutdownInput) {
        if (shutdownInput.getShutdownReason() == ShutdownReason.TERMINATE) {
            try {
                shutdownInput.getCheckpointer().checkpoint();
            } catch (ShutdownException | InvalidStateException e) {
                throw new RuntimeException(e);
            }
        }
    }

    @Override
    public void shutdownRequested(IRecordProcessorCheckpointer checkpointer) {
        try {
            checkpointer.checkpoint();
        } catch (ShutdownException | InvalidStateException e) {
            //
            // Swallow exception
            //
            e.printStackTrace();
        }
    }
}

下面是记录处理器类的更新版本。

package com.amazonaws.kcl;

import software.amazon.kinesis.exceptions.InvalidStateException;
import software.amazon.kinesis.exceptions.ShutdownException;
import software.amazon.kinesis.lifecycle.events.InitializationInput;
import software.amazon.kinesis.lifecycle.events.LeaseLostInput;
import software.amazon.kinesis.lifecycle.events.ProcessRecordsInput;
import software.amazon.kinesis.lifecycle.events.ShardEndedInput;
import software.amazon.kinesis.lifecycle.events.ShutdownRequestedInput;
import software.amazon.kinesis.processor.ShardRecordProcessor;

public class TestRecordProcessor implements ShardRecordProcessor {
    @Override
    public void initialize(InitializationInput initializationInput) {
        
    }

    @Override
    public void processRecords(ProcessRecordsInput processRecordsInput) {
        
    }

    @Override
    public void leaseLost(LeaseLostInput leaseLostInput) {
        
    }

    @Override
    public void shardEnded(ShardEndedInput shardEndedInput) {
        try {
            shardEndedInput.checkpointer().checkpoint();
        } catch (ShutdownException | InvalidStateException e) {
            //
            // Swallow the exception
            //
            e.printStackTrace();
        }
    }

    @Override
    public void shutdownRequested(ShutdownRequestedInput shutdownRequestedInput) {
        try {
            shutdownRequestedInput.checkpointer().checkpoint();
        } catch (ShutdownException | InvalidStateException e) {
            //
            // Swallow the exception
            //
            e.printStackTrace();
        }
    }
}

迁移记录处理器工厂

记录处理器工厂负责在获得租赁时创建记录处理器。以下是 KCL 1.x 工厂的示例。

package com.amazonaws.kcl;

import com.amazonaws.services.kinesis.clientlibrary.interfaces.v2.IRecordProcessor;
import com.amazonaws.services.kinesis.clientlibrary.interfaces.v2.IRecordProcessorFactory;

public class TestRecordProcessorFactory implements IRecordProcessorFactory {
    @Override
    public IRecordProcessor createProcessor() {
        return new TestRecordProcessor();
    }
}

下面是 2.0 中的记录处理器工厂的示例：

package com.amazonaws.kcl;

import software.amazon.kinesis.processor.ShardRecordProcessor;
import software.amazon.kinesis.processor.ShardRecordProcessorFactory;

public class TestRecordProcessorFactory implements ShardRecordProcessorFactory {
    @Override
    public ShardRecordProcessor shardRecordProcessor() {
        return new TestRecordProcessor();
    }
}

迁移工作人员

在 2.0 版中KCL，一个名Scheduler为的新类取代了该Worker类。以下是 KCL 1.x 工作程序的示例。

final KinesisClientLibConfiguration config = new KinesisClientLibConfiguration(...)
final IRecordProcessorFactory recordProcessorFactory = new RecordProcessorFactory();
final Worker worker = new Worker.Builder()
    .recordProcessorFactory(recordProcessorFactory)
    .config(config)
    .build();

配置 Amazon Kinesis 客户端

随着 Kinesis Client Library 版本 2.0 的发布，客户端的配置已从单个配置类（KinesisClientLibConfiguration）变为 6 个配置类。下表描述了迁移。

空闲时间移除

在 1.x 版本中KCL，对idleTimeBetweenReadsInMillis应于两个数量：

删除客户机配置

在 2.0 版本中，KCL不再创建客户端。这取决于用户提供有效的客户端。进行此更改后，已删除控制客户端创建的所有配置参数。如果需要这些参数，您可以在向 ConfigsBuilder 提供客户端之前在客户端上设置它们。