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Migrate consumers from KCL 1.x to KCL 2.x

This topic explains the differences between versions 1.x and 2.x of the Kinesis Client Library (KCL). It also shows you how to migrate your consumer from version 1.x to version 2.x of the KCL. After you migrate your client, it will start processing records from the last checkpointed location.

Version 2.0 of the KCL introduces the following interface changes:

Migrate the record processor

The following example shows a record processor implemented for KCL 1.x:

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();
        }
    }
}

The following is the updated version of the record processor class.

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();
        }
    }
}

Migrate the record processor factory

The record processor factory is responsible for creating record processors when a lease is acquired. The following is an example of a KCL 1.x factory.

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();
    }
}

The following is an example of the record processor factory in 2.0:

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();
    }
}

Migrate the worker

In version 2.0 of the KCL, a new class, called Scheduler, replaces the Worker class. The following is an example of a KCL 1.x worker.

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

Configure the Amazon Kinesis client

With the 2.0 release of the Kinesis Client Library, the configuration of the client moved from a single configuration class (KinesisClientLibConfiguration) to six configuration classes. The following table describes the migration.

Idle time removal

In the 1.x version of the KCL, the idleTimeBetweenReadsInMillis corresponded to two quantities:

Client configuration removals

In version 2.0, the KCL no longer creates clients. It depends on the user to supply a valid client. With this change, all configuration parameters that controlled client creation have been removed. If you need these parameters, you can set them on the clients before providing the clients to ConfigsBuilder.