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Filebeat 配置为使用来自 kafka 的输入并输出到文件

关闭多行设置时，输出将发布到文件中。但是当 kafka 输入配置为mutiline时，文件中没有输出（甚至没有创建文件）

这是相关的filebeat配置

输入配置

filebeat.inputs:
  - type: kafka
    hosts:
      - <ip>:9092
    topics:
      - "my-multiline-log"
    group_id: "kafka-consumer-filebeat"
    parsers:
      - multiline:
          #          type: pattern
          pattern: '^'
          negate: true
          match: after

输出配置：

output.file:
  path: "/tmp/filebeat"
  filename: filebeat
#  codec.format:
#    string: '%{[message]}'

Filebeat相关日志

2021-12-16T11:02:34.551Z    INFO    [input.kafka]   compat/compat.go:111    Input kafka starting    {"id": "19A7FFEEC9EDFC04"}
2021-12-16T11:02:34.551Z    INFO    [input.kafka.kafka input]   kafka/input.go:129  Starting Kafka input    {"id": "19A7FFEEC9EDFC04", "hosts": ["<ip>:9092"]}
2021-12-16T11:02:38.158Z    DEBUG   [reader_multiline]  multiline/pattern.go:142    Multiline event flushed because timeout reached.
2021-12-16T11:02:44.767Z    DEBUG   [reader_multiline]  multiline/pattern.go:142    Multiline event flushed because timeout reached.
2021-12-16T11:02:51.481Z    DEBUG   [reader_multiline]  multiline/pattern.go:142    Multiline event flushed because timeout reached.
2021-12-16T11:02:58.225Z    DEBUG   [reader_multiline]  multiline/pattern.go:142    Multiline event flushed because timeout reached.
2021-12-16T11:03:04.555Z    DEBUG   cgroup/util.go:276  PID 1 contains a cgroups V2 path (0::/) but no V2 mountpoint was found.
This may be because metricbeat is running inside a container on a hybrid system.
To monitor cgroups V2 processess in this way, mount the unified (V2) hierarchy inside
the container as /sys/fs/cgroup/unified and start metricbeat with --system.hostfs.

reader_multiline在日志中重复获得相同的四行

编辑：在 7.16 版中添加了对 kafka 多行解析器的支持

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