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Arinto Murdopo Josep Subirats Group 4 EEDC 2012
Outline● Current problem● What is Apache Flume?● The Flume Model ○ Flows and Nodes ○ Agent, Processor and Collector Nodes ○ Data and Control Path● Flume goals ○ Reliability ○ Scalability ○ Extensibility ○ Manageability● Use case: Near Realtime Aggregator
Current Problem● Situation:You have hundreds of services running in different serversthat produce lots of large logs which should be analyzedaltogether. You have Hadoop to process them. ● Problem:How do I send all my logs to a place that has Hadoop? Ineed a reliable, scalable, extensible and manageable wayto do it!
What is Apache Flume?● It is a distributed data collection service that gets flows of data (like logs) from their source and aggregates them to where they have to be processed.● Goals: reliability, scalability, extensibility, manageability. Exactly what I needed!
The Flume Model: Flows and Nodes● A flow corresponds to a type of data source (server logs, machine monitoring metrics...).● Flows are comprised of nodes chained together (see slide 7).
The Flume Model: Flows and Nodes● In a Node, data come in through a source... ...are optionally processed by one or more decorators... ...and then are transmitted out via a sink. Examples: Console, Exec, Syslog, IRC, Twitter, other nodes... Examples: Console, local files, HDFS, S3, other nodes... Examples: wire batching, compression, sampling, projection, extraction...
The Flume Model: Agent, Processor andCollector Nodes● Agent: receives data from an application. ● Processor (optional): intermediate processing. ● Collector: write data to permanent storage.
The Flume Model: Data and ControlPath (1/2)Nodes are in the data path.
The Flume Model: Data and ControlPath (2/2)Masters are in the control path.● Centralized point of configuration. Multiple: ZK.● Specify sources, sinks and control data flows.
Flume Goals: ReliabilityTunable Failure Recovery Modes ● Best Effort ● Store on Failure and Retry ● End to End Reliability
Flume Goals: ScalabilityHorizontally Scalable Data PathLoad Balancing
Flume Goals: ScalabilityHorizontally Scalable Control Path
Flume Goals: Extensibility● Simple Source and Sink API ○ Event streaming and composition of simple operation ● Plug in Architecture ○ Add your own sources, sinks, decorators
Flume Goals: ManageabilityCentralized Data Flow Management Interface