Flume日志采集系统:架构与实战解析

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"Flume是Cloudera设计的用于海量日志采集、聚合和传输的系统,具有分布式、高可用和高可靠性的特点。它允许用户定制数据发送方以适应不同协议,同时提供数据处理能力,如过滤和格式转换。Flume通过其三层架构——Agent、Collector和Storage实现扩展性和容错性。它提供了三种级别的可靠性保障,分别是end-to-end、StoreonFailure和BestEffort。系统中的每个Agent和Collector由Master统一管理,Master可以通过ZooKeeper实现多实例和负载均衡,避免单点故障。用户可以通过Web或Shell命令管理数据流,并可以添加自定义组件。Flume内建多种Agent、Collector和Storage组件,如File、Syslog、HDFS等,便于用户根据需求构建日志处理流程。" Flume的核心在于其Agent,它作为数据采集的基本单元,包含Source、Channel和Sink三个部分。Source负责从各种数据源收集信息,例如网络日志、系统日志等,支持多种数据发送方。Channel作为临时存储,确保数据在传输过程中的可靠性,即使Agent或Sink出现问题,数据也不会丢失。Sink则将数据传输到目标位置,如HDFS、HBase或其他存储系统。 Flume的高可用性体现在其能够通过水平扩展Agent和Collector来增加处理能力,同时通过ZooKeeper实现动态配置和故障恢复。在Master节点出现故障时,ZooKeeper可以保证集群的稳定运行。此外,Flume的Web服务器和Shell命令工具使用户能便捷地监控和管理数据流,进行配置更新和动态加载。 在实际应用中,Flume常用于日志分析、实时数据处理等场景,尤其在大数据生态系统中,它作为一个重要的数据接入层,能够有效地将分散的日志数据整合起来,为后续的分析和处理提供基础。通过灵活的插件机制,Flume可以轻松地集成到各种复杂环境中,满足企业的不同需求。

org.apache.flume.EventDeliveryException: Failed to send events at org.apache.flume.sink.AbstractRpcSink.process(AbstractRpcSink.java:389) at org.apache.flume.sink.DefaultSinkProcessor.process(DefaultSinkProcessor.java:67) at org.apache.flume.SinkRunner$PollingRunner.run(SinkRunner.java:145) at java.lang.Thread.run(Thread.java:748) Caused by: org.apache.flume.FlumeException: NettyAvroRpcClient { host: localhost, port: 44444 }: RPC connection error at org.apache.flume.api.NettyAvroRpcClient.connect(NettyAvroRpcClient.java:181) at org.apache.flume.api.NettyAvroRpcClient.connect(NettyAvroRpcClient.java:120) at org.apache.flume.api.NettyAvroRpcClient.configure(NettyAvroRpcClient.java:638) at org.apache.flume.api.RpcClientFactory.getInstance(RpcClientFactory.java:90) at org.apache.flume.sink.AvroSink.initializeRpcClient(AvroSink.java:127) at org.apache.flume.sink.AbstractRpcSink.createConnection(AbstractRpcSink.java:210) at org.apache.flume.sink.AbstractRpcSink.verifyConnection(AbstractRpcSink.java:270) at org.apache.flume.sink.AbstractRpcSink.process(AbstractRpcSink.java:346) ... 3 more Caused by: java.io.IOException: Error connecting to localhost/127.0.0.1:44444 at org.apache.avro.ipc.NettyTransceiver.getChannel(NettyTransceiver.java:261) at org.apache.avro.ipc.NettyTransceiver.<init>(NettyTransceiver.java:203) at org.apache.avro.ipc.NettyTransceiver.<init>(NettyTransceiver.java:152) at org.apache.flume.api.NettyAvroRpcClient.connect(NettyAvroRpcClient.java:167) ... 10 more Caused by: java.net.ConnectException: 拒绝连接: localhost/127.0.0.1:44444 at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method) at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:717) at org.jboss.netty.channel.socket.nio.NioClientBoss.connect(NioClientBoss.java:152) at org.jboss.netty.channel.socket.nio.NioClientBoss.processSelectedKeys(NioClientBoss.java:105) at org.jboss.netty.channel.socket.nio.NioClientBoss.process(NioClientBoss.java:79) at org.jboss.netty.channel.socket.nio.AbstractNioSelector.run(AbstractNioSelector.java:318) at org.jboss.netty.channel.socket.nio.NioClientBoss.run(NioClientBoss.java:42) at org.jboss.netty.util.ThreadRenamingRunnable.run(ThreadRenamingRunnable.java:108) at org.jboss.netty.util.internal.DeadLockProofWorker$1.run(DeadLockProofWorker.java:42) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) ... 1 more

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