[英]How to fetch ConsumerOffset (stored in kafka) for a consumer group in Java?
我有多个不同主题的Kafka消费者和生产者。 对于独立应用程序,我想监视卡夫卡消费者的滞后时间。
我正在使用kafka 0.10.0.1,因为Kafka现在将消费者补偿存储在kafka本身中,所以如何读取相同的内容。
我能够读取每个分区的主题偏移量。
您可以编写如下代码来获取组的偏移量:
public ByteBuffer send(String host, int port, AbstractRequest request, ApiKeys apiKey) throws IOException {
Socket socket = connect(host, port);
try {
return send(request, apiKey, socket);
} finally {
socket.close();
}
}
private byte[] issueRequestAndWaitForResponse(Socket socket, byte[] request) throws IOException {
sendRequest(socket, request);
return getResponse(socket);
}
private void sendRequest(Socket socket, byte[] request) throws IOException {
DataOutputStream dos = new DataOutputStream(socket.getOutputStream());
dos.writeInt(request.length);
dos.write(request);
dos.flush();
}
private byte[] getResponse(Socket socket) throws IOException {
DataInputStream dis = null;
try {
dis = new DataInputStream(socket.getInputStream());
byte[] response = new byte[dis.readInt()];
dis.readFully(response);
return response;
} finally {
if (dis != null) {
dis.close();
}
}
}
private Socket connect(String hostName, int port) throws IOException {
return new Socket(hostName, port);
}
private ByteBuffer send(AbstractRequest request, ApiKeys apiKey, Socket socket) throws IOException {
RequestHeader header = new RequestHeader(apiKey.id, request.version(), "client-id", 0);
ByteBuffer buffer = ByteBuffer.allocate(header.sizeOf() + request.sizeOf());
header.writeTo(buffer);
request.writeTo(buffer);
byte[] serializedRequest = buffer.array();
byte[] response = issueRequestAndWaitForResponse(socket, serializedRequest);
ByteBuffer responseBuffer = ByteBuffer.wrap(response);
ResponseHeader.parse(responseBuffer);
return responseBuffer;
}
// Get offsets of a given topic for a group
public void getOffsetForPartition(String groupID, String topic, int parititon) throws IOException {
TopicPartition tp = new TopicPartition(topic, parititon);
OffsetFetchRequest request = new OffsetFetchRequest.Builder(groupID, singletonList(tp)).setVersion((short)2).build();
ByteBuffer response = send("localhost", 9092, request, ApiKeys.OFFSET_FETCH);
OffsetFetchResponse resp = OffsetFetchResponse.parse(response, request.version());
OffsetFetchResponse.PartitionData partitionData = resp.responseData().get(tp);
System.out.println(partitionData.offset);
}
// Get offsets of all topics for a group
public Map<TopicPartition, OffsetFetchResponse.PartitionData> getAllOffsetsForGroup(String groupID) throws IOException {
OffsetFetchRequest request = new OffsetFetchRequest.Builder(groupID, null).setVersion((short)2).build();
ByteBuffer response = send("localhost", 9092, request, ApiKeys.OFFSET_FETCH);
OffsetFetchResponse resp = OffsetFetchResponse.parse(response, request.version());
return resp.responseData();
}
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