Flume Sequence Generator Source

Prerequisites

Configuring Flume

Sequence Generator Source

  • Channels
  • Source type − seq

Memory Channel

  • type − It holds the type of the channel. In our example the type is MemChannel.
  • Capacity − It is the maximum number of events stored in the channel. Its default value is 100. (optional)
  • TransactionCapacity − It is the maximum number of events the channel accepts or sends. Its default is 100. (optional).

HDFS Sink

  • Channel
  • type − hdfs
  • hdfs.path − the path of the directory in HDFS where data is to be stored.

Example – Configuration File

seq_gen.conf

# Naming the components on the current agent

SeqGenAgent.sources = SeqSource
SeqGenAgent.channels = MemChannel
SeqGenAgent.sinks = HDFS

# Describing/Configuring the source
SeqGenAgent.sources.SeqSource.type = seq

# Describing/Configuring the sink
SeqGenAgent.sinks.HDFS.type = hdfs
SeqGenAgent.sinks.HDFS.hdfs.path = hdfs://localhost:9000/user/Hadoop/seqgen_data/
SeqGenAgent.sinks.HDFS.hdfs.filePrefix = log
SeqGenAgent.sinks.HDFS.hdfs.rollInterval = 0
SeqGenAgent.sinks.HDFS.hdfs.rollCount = 10000
SeqGenAgent.sinks.HDFS.hdfs.fileType = DataStream

# Describing/Configuring the channel
SeqGenAgent.channels.MemChannel.type = memory
SeqGenAgent.channels.MemChannel.capacity = 1000
SeqGenAgent.channels.MemChannel.transactionCapacity = 100

# Binding the source and sink to the channel
SeqGenAgent.sources.SeqSource.channels = MemChannel
SeqGenAgent.sinks.HDFS.channel = MemChannel

Execution

$ cd $FLUME_HOME
$./bin/flume-ng agent --conf $FLUME_HOME/conf --conf-file $FLUME_HOME/conf/seq_gen.conf --name SeqGenAgent

Verifying the HDFS

Verifying the Contents of the File

hdfs dfs -cat hdfs://localhost:9000/user/Hadoop/seqgen_data/log.1559538145091

Results

tail -f -n 99 /usr/local/apache-flume-1.9.0/logs/flume.log