版权声明: https://blog.csdn.net/KamRoseLee/article/details/83780556
1:Avro Client
MyApp.java
import org.apache.flume.Event;
import org.apache.flume.EventDeliveryException;
import org.apache.flume.api.RpcClient;
import org.apache.flume.api.RpcClientFactory;
import org.apache.flume.event.EventBuilder;
import java.nio.charset.Charset;
public class MyApp {
public static void main(String[] args) {
MyRpcClientFacade client = new MyRpcClientFacade();
// Initialize client with the remote Flume agent's host and port
client.init("host.example.org", 41414);
// Send 10 events to the remote Flume agent. That agent should be
// configured to listen with an AvroSource.
String sampleData = "Hello Flume!";
for (int i = 0; i < 10; i++) {
client.sendDataToFlume(sampleData);
}
client.cleanUp();
}
}
class MyRpcClientFacade {
private RpcClient client;
private String hostname;
private int port;
public void init(String hostname, int port) {
// Setup the RPC connection
this.hostname = hostname;
this.port = port;
this.client = RpcClientFactory.getDefaultInstance(hostname, port);
// Use the following method to create a thrift client (instead of the above line):
// this.client = RpcClientFactory.getThriftInstance(hostname, port);
}
public void sendDataToFlume(String data) {
// Create a Flume Event object that encapsulates the sample data
Event event = EventBuilder.withBody(data, Charset.forName("UTF-8"));
// Send the event
try {
client.append(event);
} catch (EventDeliveryException e) {
// clean up and recreate the client
client.close();
client = null;
client = RpcClientFactory.getDefaultInstance(hostname, port);
// Use the following method to create a thrift client (instead of the above line):
// this.client = RpcClientFactory.getThriftInstance(hostname, port);
}
}
public void cleanUp() {
// Close the RPC connection
client.close();
}
}
#配置文件:case_client.conf
a1.channels = c1
a1.sources = r1
a1.sinks = k1
a1.channels.c1.type = memory
a1.sources.r1.channels = c1
a1.sources.r1.type = avro
# For using a thrift source set the following instead of the above line.
# a1.source.r1.type = thrift
a1.sources.r1.bind = 0.0.0.0
a1.sources.r1.port = 41414
a1.sinks.k1.channel = c1
a1.sinks.k1.type = logger
#开始命令
flume-ng agent -c conf -f conf/case_client.conf -n a1 -Dflume.root.logger=INFO,console
2:Custom Sink (目的:将获取的数据存入mysql中,还没有实现。)
MySink.java
import org.apache.flume.Channel;
import org.apache.flume.Context;
import org.apache.flume.Event;
import org.apache.flume.EventDeliveryException;
import org.apache.flume.Transaction;
import org.apache.flume.conf.Configurable;
import org.apache.flume.sink.AbstractSink;
public class MySink extends AbstractSink implements Configurable {
private String myProp;
@Override
public void configure(Context context) {
String myProp = context.getString("myProp", "defaultValue");
// Process the myProp value (e.g. validation)
// Store myProp for later retrieval by process() method
this.myProp = myProp;
}
@Override
public void start() {
// Initialize the connection to the external repository (e.g. HDFS) that
// this Sink will forward Events to ..
}
@Override
public void stop () {
// Disconnect from the external respository and do any
// additional cleanup (e.g. releasing resources or nulling-out
// field values) ..
}
@Override
public Status process() throws EventDeliveryException {
Status status = null;
// Start transaction
Channel ch = getChannel();
Transaction txn = ch.getTransaction();
txn.begin();
try {
// This try clause includes whatever Channel operations you want to do
Event event = ch.take();
// Send the Event to the external repository.
// storeSomeData(e);
txn.commit();
status = Status.READY;
} catch (Throwable t) {
txn.rollback();
// Log exception, handle individual exceptions as needed
status = Status.BACKOFF;
// re-throw all Errors
if (t instanceof Error) {
throw (Error)t;
}
} finally {
txn.close();
}
return status;
}
}
#配置文件:case_custom_sink.conf
a1.channels = c1
a1.sources = r1
a1.sinks = k1
a1.channels.c1.type = memory
a1.sources.r1.channels = c1
a1.sources.r1.type = avro
# For using a thrift source set the following instead of the above line.
# a1.source.r1.type = thrift
a1.sources.r1.bind = 0.0.0.0
a1.sources.r1.port = 41414
a1.sinks.k1.channel = c1
a1.sinks.k1.type = com.flume.test.MySink
#开始命令
flume-ng agent -c conf -f conf/case_custom_sink.conf -n a1 -Dflume.root.logger=INFO,console
3:custom source
MySource.java
import java.util.List;
import org.apache.flume.Channel;
import org.apache.flume.Context;
import org.apache.flume.Event;
import org.apache.flume.EventDeliveryException;
import org.apache.flume.PollableSource;
import org.apache.flume.Transaction;
import org.apache.flume.conf.Configurable;
import org.apache.flume.source.AbstractSource;
public class MySource extends AbstractSource implements Configurable, PollableSource {
private String myProp;
@Override
public void configure(Context context) {
String myProp = context.getString("myProp", "defaultValue");
// Process the myProp value (e.g. validation, convert to another type, ...)
// Store myProp for later retrieval by process() method
this.myProp = myProp;
}
@Override
public void start() {
// Initialize the connection to the external client
}
@Override
public void stop () {
// Disconnect from external client and do any additional cleanup
// (e.g. releasing resources or nulling-out field values) ..
}
@Override
public Status process() throws EventDeliveryException {
// TODO Auto-generated method stub
List<Channel> list = getChannelProcessor().getSelector().getAllChannels();
Status status = null;
// Start transaction
Channel ch = list.get(0);
Transaction txn = ch.getTransaction();
txn.begin();
try {
// This try clause includes whatever Channel operations you want to do
// Receive new data
Event e = null;//getSomeData();EventBuilder.withBody(data, Charset.forName("UTF-8"), headerMap);EventBuilder.withBody(data, Charset.forName("UTF-8"));
// Store the Event into this Source's associated Channel(s)
getChannelProcessor().processEvent(e);
txn.commit();
status = Status.READY;
} catch (Throwable t) {
txn.rollback();
// Log exception, handle individual exceptions as needed
status = Status.BACKOFF;
// re-throw all Errors
if (t instanceof Error) {
throw (Error)t;
}
} finally {
txn.close();
}
return status;
}
}
#配置文件:case_custom_source.conf
a1.channels = c1
a1.sources = r1
a1.sinks = k1
a1.channels.c1.type = memory
a1.sources.r1.channels = c1
a1.sources.r1.type = com.wy.test.MySource
a1.sinks.k1.channel = c1
a1.sinks.k1.type = logger
#开始命令
flume-ng agent -c conf -f conf/case_custom_source.conf -n a1 -Dflume.root.logger=INFO,consol