influxdb 生态圈 自带采集数据工具 telegraf，telegraf集成了很多功能，包括订阅kafka数据，但是由于telegraf 订阅 kafka 性能太低，所以自定义开发了 flume sink插件，使得 订阅数据性能获得了极大提高。

InfluxSink

样例代码如下，以飨读者。

package org.apache.flume.sink.influx;




import org.apache.flume.*;
import org.apache.flume.conf.Configurable;
import org.apache.flume.instrumentation.SinkCounter;
import org.apache.flume.sink.AbstractSink;
import org.apache.log4j.Logger;
import org.influxdb.InfluxDB;
import org.influxdb.InfluxDBFactory;

public class InfluxSink extends AbstractSink implements Configurable {
    private static final Logger LOG = Logger.getLogger(InfluxSink.class);
    private String url;
    private int batchSize;
    private String database;
    private String username;
    private String password;
    private String influxsource;
    private InfluxDB influxDB;
    private String truncateTimestamp;
    private SinkCounter sinkCounter;


    public void configure(Context context) {
        String host = context.getString("host", "localhost");
        String port = context.getString("port", "8186");
        String database = context.getString("database", "flumetest");   
        int batchSize = context.getInteger("batchSize", 1000);
        String username = context.getString("username","root");
        String password = context.getString("password","root");
        String influxsource = context.getString("influxsource","body");
        String url = "http://"+host+":"+port;
        this.url = url;
        this.batchSize = batchSize;
        this.database = database;
        this.username = username;
        this.password = password;
        this.influxsource = influxsource;
        this.truncateTimestamp = truncateTimestamp;
        if (sinkCounter == null) {
            sinkCounter = new SinkCounter(getName());
        }
    }

    @Override
    public void start() {
      LOG.info("Starting Influx Sink {} ...Connecting to "+url);
      try {
        InfluxDB influxDB = InfluxDBFactory.connect(url,username,password);
        this.influxDB = influxDB;
        sinkCounter.incrementConnectionCreatedCount();
      }

      catch ( Exception e ){
        e.printStackTrace();
        LOG.error(e.getMessage());
        sinkCounter.incrementConnectionFailedCount();
      }
      sinkCounter.start();
    }

    @Override
    public void stop () {
        LOG.info("Stopping Influx Sink {} ...");
        sinkCounter.incrementConnectionClosedCount();
        sinkCounter.stop();
    }


    public Status process() throws EventDeliveryException {
        Status status = null;
        // Start transaction
        Channel ch = getChannel();
        Transaction txn = ch.getTransaction();
        txn.begin();
        try {
            StringBuilder batch = new StringBuilder();
            Event event = null;
            int count = 0;
            sinkCounter.incrementEventDrainAttemptCount();
            for (count = 0; count <= batchSize; ++count) {
                event = ch.take();
                if (event == null) {
                    break;
                }
                String InfluxEvent = ExtractInfluxEvent(event, influxsource);
                if ( batch.length() > 0) {
                    batch.append("\n");
                }
                batch.append(InfluxEvent);
                sinkCounter.incrementConnectionCreatedCount();

            }

            LOG.info("process() count:" + count);
            if (count <= 0) {
                sinkCounter.incrementBatchEmptyCount();
                sinkCounter.incrementEventDrainSuccessCount();
                status = Status.BACKOFF;
            } 
            else {
                try {

                    influxDB.write(database, "autogen", InfluxDB.ConsistencyLevel.ONE, batch.toString());
                    status = Status.READY;
                    if ( count < batchSize ) {
                        sinkCounter.incrementBatchUnderflowCount();
                    }
                    sinkCounter.incrementBatchCompleteCount();
                }
                catch ( Exception e) {
                    e.printStackTrace();
                    LOG.info(e.getMessage());
                    //txn.rollback();
                    status = Status.BACKOFF;
                    sinkCounter.incrementConnectionFailedCount();
                }
            }
            txn.commit();
            if(event == null) {
                status = Status.BACKOFF;
            }

            return status;
        }
        catch (Throwable t) {
            txn.rollback();
            // Log exception, handle individual exceptions as needed
            LOG.info(t.getMessage());
            status = Status.BACKOFF;

            // re-throw all Errors
            if (t instanceof Error) {
                throw (Error)t;
            }
        }
        finally {
            txn.close();
        }
        return status;
  }

private String ExtractInfluxEvent(Event event, String influx_source) {

    if ( influx_source.equals("body")) {
        String body = new String(event.getBody());
        //Fix for data coming from windows
 //       body = body.replaceAll("\\r","");


        return body.toString();

    }
    else { LOG.error("Just body is supported for the moment");
    return null;
    }

}


}