A Flume agent is a (JVM) process that hosts the components through which events flow from an external source to the next destination (hop). The channel is a passive store that keeps the event until it’s consumed by a Flume sink.
Where is the Flume agent installed?
The main Flume files are located in /usr/hdp/current/flume-server . The main configuration files are located in /etc/flume/conf .
How do I stop Flume agent?
2 ways to stop the Flume agent:
- Go to the terminal where Flume agent is running and press ctrl+C to forcefully kill the agent.
- Run jps from any terminal and look for ‘Application’ process. Note down its process id and then run kill -9 to terminate the process.
How do I run Flume agent?
There are two options for starting Flume.
- To start Flume directly, run the following command on the Flume host: /usr/hdp/current/flume-server/bin/flume-ng agent -c /etc/flume/conf -f /etc/flume/conf/ flume.conf -n agent.
- To start Flume as a service, run the following command on the Flume host: service flume-agent start.
What is Flume sink?
Apache Flume sink is the component of flume agent. It is used for storing data into a centralized store such as HDFS, HBase, etc. In simple words, the component that removes events from a Flume agent and writes it to another flume agent or some other system or a data store is called a sink.
What is the main use case of Flume?
Apache Flume is an open-source tool that is used for collecting and transferring streaming data from the external sources to the terminal repository such as HBase, HDFS, etc. With Apache Flume we can transfer the real-time logs generated by web servers to the HDFS.
Can Flume distribute data to multiple destinations?
Can Flume can distribute data to multiple destinations? Answer: Flume generally supports multiplexing flow. Here, event flows from one source to multiple channel and multiple destinations. Basically, it is achieved by defining a flow multiplexer.
Where we can use Flume?
1. Apache Flume can be used in the situation when we want to collect data from the varieties of sources and store them on the Hadoop system. 2. We can use Flume whenever we need to handle high-volume and high-velocity data into a Hadoop system.
Does Flume provide 100% reliability to the data flow?
Yes, it provides end-to-end reliability of the flow. By default, Flume uses a transactional approach in the data flow. Sources and sinks are encapsulated in a transactional repository provided by the channels. So it provides 100% reliability to the data flow.
What is the difference between Flume and Kafka?
Kafka runs as a cluster which handles the incoming high volume data streams in the real time. Flume is a tool to collect log data from distributed web servers. Kafka will treat each topic partition as an ordered set of messages.
What is Flume hydraulics?
When used to measure the flow of water in open channels, a flume is defined as a specially shaped, fixed hydraulic structure that under free-flow conditions forces flow to accelerate in such a manner that the flow rate through the flume can be characterized by a level-to-flow relationship as applied to a single head ( …
What is flume used for in Hadoop?
Flume. Apache Flume is an open-source, powerful, reliable and flexible system used to collect, aggregate and move large amounts of unstructured data from multiple data sources into HDFS/Hbase (for example) in a distributed fashion via it’s strong coupling with the Hadoop cluster.
What is an agent in flume?
The agent is a JVM process in Flume. It receives events from the clients or other agents and transfers it to the destination or other agents. It is a JVM process that consists of three components that are a source, channel, and sink through which data flow occurs in Flume.
What is a flume source?
A Flume source is the component of Flume Agent which consumes data (events) from data generators like a web server and delivers it to one or more channels. The data generator sends data (events) to Flume in a format recognized by the target Flume source.
What is the use of flume in HDFS?
Flume is a framework which is used to move log data into HDFS. Generally events and log data are generated by the log servers and these servers have Flume agents running on them. These agents receive the data from the data generators. The data in these agents will be collected by an intermediate node known as Collector.
Where is Agent configuration stored in flume?
Flume agent configuration is stored in a local configuration file. This is a text file that follows the Java properties file format. Configurations for one or more agents can be specified in the same configuration file.
