hadoop-metrics

hadoop-metrics is a wrapper for Hadoop Metrics API.

Installation

gem

gem install hadoop-metrics

Usage

Setup

Without jmx method, getting metrics depends on /metrics API. So if you use this library, then you should enable dumping each metrics via hadoop-metrics.properties.

# example
mapred.class=org.apache.hadoop.metrics.spi.NoEmitMetricsContext
mapred.period=30 

JobTracker

require 'hadoop_metrics/job_tracker'

jt = HadoopMetrics::JobTracker.new('localhost', 50030)
puts JSON.pretty_generate(jt.fairscheduler_jobs)

TaskTracker

require 'hadoop_metrics/task_tracker'

tt = HadoopMetrics::TaskTracker.new('localhost', 50060)
puts JSON.pretty_generate(tt.shuffle_output)

NameNode

require 'hadoop_metrics/name_node'

nn = HadoopMetrics::NameNode.new('localhost', 50070)
puts JSON.pretty_generate(nn.dfs)

DataNode

require 'hadoop_metrics/data_node'

dn = HadoopMetrics::DataNode.new('localhost', 50075)
puts JSON.pretty_generate(dn.info)

Copyright

Author	Masahiro Nakagawa
Copyright	Copyright (c) 2013- Masahiro Nakagawa
License	MIT License