flume.sink自定义实现sink输出异常[已解决]

java 逻辑

package com.xxxx.flume.sink;

import org.apache.flume.*;
import org.apache.flume.conf.Configurable;
import org.apache.flume.sink.AbstractSink;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class MySink extends AbstractSink implements Configurable {

    private Logger logger = LoggerFactory.getLogger(MySink.class);
    private String prefix;
    private String subfix;

    //读取conf中 配置的参数
    public void configure(Context context) {
        this.prefix = context.getString("prefix");
        this.subfix = context.getString("subfix");
    }

    public Status process() throws EventDeliveryException {
        Status status = null;

        Channel channel = getChannel();

        Transaction transaction = channel.getTransaction();
        transaction.begin();

        try {
            Event event = channel.take();
            if (event != null) {

                // ==== 添加业务逻辑开始 ====
                String body = new String(event.getBody());
                logger.warn("prefix:" + this.prefix + ",\nbody:" + body + ",\nsubfix:" + this.subfix);
                String out_log_body = "prefix:" + this.prefix + ",\tbody:" + body + ",\tsubfix:" + this.subfix;

                logger.warn(out_log_body);
                logger.info(out_log_body);
                // ==== 业务逻辑结束 ====

            }
            transaction.commit();
            status = Status.READY;
        } catch (ChannelException e) {
            e.printStackTrace();
            transaction.rollback();
            status = Status.BACKOFF;
        } finally {
            transaction.close();
        }

        return status;
    }

}

配置文件

#name
a1.sources = s1
a1.channels = c1
a1.sinks = k1

# Source
a1.sources.s1.type = netcat
a1.sources.s1.bind = localhost
a1.sources.s1.port = 44449

# channels [c1]
a1.channels.c1.type = memory
a1.channels.c1.capacity = 100
a1.channels.c1.overflowCapacity  = 1000

# sinks [k1 k2]
a1.sinks.k1.type = com.xxxx.flume.sink.MySink
a1.sinks.k1.prefix = xxxx__
a1.sinks.k1.subfix = __yyyy

# Bind
a1.sources.s1.channels = c1
a1.sinks.k1.channel = c1

输入输出结果

启动flume
bin/flume-ng agent -c conf -f job/sink_test/flume1.conf --name a1 -Dflume.root.logger=INFO,console

结果如下：

# 输入
% telnet localhost 44449
...
0000000000
OK

# 输出 一个是字符串拼接有问题，一个是logger.info()输出有问题
...
2019-11-18 16:26:54,557 (SinkRunner-PollingRunner-DefaultSinkProcessor) [WARN - com.xxxx.flume.sink.MySink.process(MySink.java:42)] prefix:xxxx__,
,ody:0000000000
subfix:__yyyy
2019-11-18 16:26:54,559 (SinkRunner-PollingRunner-DefaultSinkProcessor) [WARN - com.xxxx.flume.sink.MySink.process(MySink.java:45)],prefix:subfix:__yyyy0000000000
2019-11-18 16:26:54,559 (SinkRunner-PollingRunner-DefaultSinkProcessor) [INFO - com.xxxx.flume.sink.MySink.process(MySink.java:46)],prefix:subfix:__yyyy0000000000
...

发现问题！解决它！

最后在命令行输入数据的时候发现乱码

admin@Tmp flume_interceptor % telnet localhost 44449
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
asd
OK
o<^Lo<^Lo<^Lo<^Lo<^Lo<^Lo<^L
OK
c^@^Qc^@^Qc^@^Q
OK

于是把source的类型更换为exec，在conf文件中使用

# Source
a1.sources.s1.type = exec
a1.sources.s1.command = tail -F /Users/admin/log/test.log
a1.sources.s1.shell= /bin/sh -c

搞定了！

重启flume的agent，在命令行写入数据到监控到文件，问题解决
输入：

echo 321321321 >> /Users/admin/log/test.log

输出总于正常了：

2019-11-18 19:11:59,872 (SinkRunner-PollingRunner-DefaultSinkProcessor) [WARN - com.babyfs.flume.sink.MySink.process(MySink.java:42)] prefix:xxxx__,
body:321321321,
subfix:__yyyy
2019-11-18 19:11:59,872 (SinkRunner-PollingRunner-DefaultSinkProcessor) [WARN - com.babyfs.flume.sink.MySink.process(MySink.java:45)] prefix:xxxx__,	body:321321321,	subfix:__yyyy
2019-11-18 19:11:59,873 (SinkRunner-PollingRunner-DefaultSinkProcessor) [INFO - com.babyfs.flume.sink.MySink.process(MySink.java:46)] prefix:xxxx__,	body:321321321,	subfix:__yyyy

虽然 只是学习测试用，但是不调通还是不舒服，现在舒服了。