Class: MongoMonitor

Inherits:
Rubix::ClusterMonitor show all
Defined in:
lib/rubix/examples/mongo_monitor.rb

Constant Summary collapse

CLUSTER_HOSTGROUPS =

Hostgroup for any hosts that needs to be created.

'MongoDB clusters'
CLUSTER_TEMPLATES =

Templates for any hosts that need to be created.

'Template_MongoDB'
CLUSTER_APPLICATIONS =

Applications

'_cluster'
IGNORED_DATABASES =

Names of database to ignore when we find them.

%w[db test admin local].to_set

Instance Attribute Summary

Attributes inherited from Rubix::ClusterMonitor

#nodes_by_cluster, #private_ips_by_cluster

Attributes inherited from Rubix::Monitor

#settings

Instance Method Summary collapse

Methods inherited from Rubix::ClusterMonitor

#clusters, #group_nodes_by_cluster, #initialize, #measure, #node_query

Methods inherited from Rubix::ChefMonitor

#chef_node_from_node_name, #chef_node_name_from_ip, default_settings, #initialize, #search_nodes, #set_chef_credentials

Methods inherited from Rubix::Monitor

#close, default_settings, #fifo?, #file?, #initialize, #loop?, #loop_period, #measure, #output, #output_path, #run, run, #stdout?, #write

Constructor Details

This class inherits a constructor from Rubix::ClusterMonitor

Instance Method Details

#matching_chef_nodes ⇒ Object 



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# File 'lib/rubix/examples/mongo_monitor.rb', line 25

def matching_chef_nodes
  Chef::Search::Query.new.search('node', 'provides_service:*-mongodb-server')
end

#measure_cluster(cluster_name) ⇒ Object 



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# File 'lib/rubix/examples/mongo_monitor.rb', line 29

def measure_cluster cluster_name
  measured_mongo_server    = false
  measured_mongo_databases = false
  private_ips_by_cluster[cluster_name].each do |private_ip|
    begin
      connection = Mongo::Connection.new(private_ip)
    rescue Mongo::ConnectionFailure => e
      next
    end
    measured_mongo_server    = measure_mongo_server(cluster_name, connection)    unless measured_mongo_server
    measured_mongo_databases = measure_mongo_databases(cluster_name, connection) unless measured_mongo_databases
    break if measured_mongo_server && measured_mongo_databases
  end
end

#measure_mongo_databases(cluster_name, connection) ⇒ Object 



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# File 'lib/rubix/examples/mongo_monitor.rb', line 101

def measure_mongo_databases cluster_name, connection
  dbs = connection.database_names
  return true if dbs.size == 0 # nothing to do here

  dbs.each do |database_name|
    next if self.class::IGNORED_DATABASES.include?(database_name.downcase)
    stats = connection.db(database_name).stats()

    write({
            :hostname    => "#{cluster_name}-mongodb",
            :hostgroup   => self.class::CLUSTER_HOSTGROUPS,
            :templates   => self.class::CLUSTER_TEMPLATES,
            :application => database_name
           }) do |d|
      d << ["#{database_name}.collections",      stats["collections"] ]
      d << ["#{database_name}.objects.count",    stats["objects"]     ]
      d << ["#{database_name}.objects.avg_size", stats["avgObjSize"]  ]
      d << ["#{database_name}.size.data",        stats["dataSize"]    ]
      d << ["#{database_name}.size.disk",        stats["storageSize"] ]
      d << ["#{database_name}.size.indexes",     stats["indexSize"]   ]
      d << ["#{database_name}.size.file",        stats["fileSize"]    ]
      d << ["#{database_name}.extents",          stats["numExtents"]  ]
      d << ["#{database_name}.indexes",          stats["indexes"]     ]
    end
  end
  true
end

#measure_mongo_server(cluster_name, connection) ⇒ Object 



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# File 'lib/rubix/examples/mongo_monitor.rb', line 44

def measure_mongo_server cluster_name, connection
  initial = nil, final = nil
  db       = connection.db('system') # the name of this db doesn't matter?
  command = {:serverStatus => true}  # the value of the 'serverStatus' key doesn't matter?

  # gather metrics with a 1.0 second gap
  initial = db.command(command) ; sleep 1.0 ; final = db.command(command)
  return false unless initial && final
  dt = final['localTime'].to_f - initial['localTime'].to_f
  write({
          :hostname    => "#{cluster_name}-mongodb",
          :hostgroup   => self.class::CLUSTER_HOSTGROUPS,
          :templates   => self.class::CLUSTER_TEMPLATES,
          :application => self.class::CLUSTER_APPLICATIONS
         }) do |d|
    
    # operations
    d << ['inserts',       (final['opcounters']['insert']  - initial['opcounters']['insert'])  / dt]
    d << ['queries',       (final['opcounters']['query']   - initial['opcounters']['query'])   / dt]
    d << ['updates',       (final['opcounters']['update']  - initial['opcounters']['update'])  / dt]
    d << ['deletes',       (final['opcounters']['delete']  - initial['opcounters']['delete'])  / dt]
    d << ['getmores',      (final['opcounters']['getmore'] - initial['opcounters']['getmore']) / dt]
    d << ['commands',      (final['opcounters']['command'] - initial['opcounters']['command']) / dt]

    # memory
    d << ['mem.resident',  final['mem']['resident']]
    d << ['mem.virtual',   final['mem']['virtual']]
    d << ['mem.mapped',    final['mem']['mapped']]

    # disk
    d << ['flushes',       (final['backgroundFlushing']['flushes']  - initial['backgroundFlushing']['flushes'])  / dt]
    d << ['flush_time',    (final['backgroundFlushing']['total_ms'] - initial['backgroundFlushing']['total_ms'])     ]
    d << ['faults',        (final['extra_info']['page_faults']      - initial['extra_info']['page_faults'])      / dt]

    # index
    d << ['accesses',        (final['indexCounters']['btree']['accesses'] - initial['indexCounters']['btree']['accesses']) / dt]
    d << ['hits',            (final['indexCounters']['btree']['hits']     - initial['indexCounters']['btree']['hits'])     / dt]
    d << ['misses',          (final['indexCounters']['btree']['misses']   - initial['indexCounters']['btree']['misses'])   / dt]
    d << ['resets',          (final['indexCounters']['btree']['resets']   - initial['indexCounters']['btree']['resets'])   / dt]

    # read/write load
    d << ['queue.total',   final['globalLock']['currentQueue']['total']]
    d << ['queue.read',    final['globalLock']['currentQueue']['readers']]
    d << ['queue.write',   final['globalLock']['currentQueue']['writers']]
    d << ['clients.total', final['globalLock']['activeClients']['total']]
    d << ['clients.read',  final['globalLock']['activeClients']['readers']]
    d << ['clients.write', final['globalLock']['activeClients']['writers']]

    # network
    d << ['net.in',        (final['network']['bytesIn']     - initial['network']['bytesIn'])     / dt]
    d << ['net.out',       (final['network']['bytesOut']    - initial['network']['bytesOut'])    / dt]
    d << ['requests',      (final['network']['numRequests'] - initial['network']['numRequests']) / dt]
    d << ['connections',   final['connections']['current']]
  end
  true
end