Class: Fluent::MysqlBinlogFlydataInput

Inherits:
MysqlBinlogInput
  • Object
show all
Includes:
MysqlBinlogFlydataInputPreference
Defined in:
lib/flydata/fluent-plugins/in_mysql_binlog_flydata.rb

Constant Summary

Constants included from MysqlBinlogFlydataInputPreference

Fluent::MysqlBinlogFlydataInputPreference::CUSTOM_CONFIG_PARAMS

Instance Method Summary collapse

Methods included from MysqlBinlogFlydataInputPreference

included

Constructor Details

#initialize ⇒ MysqlBinlogFlydataInput

Returns a new instance of MysqlBinlogFlydataInput.



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# File 'lib/flydata/fluent-plugins/in_mysql_binlog_flydata.rb', line 45

def initialize
  super
  install_custom_signal_handler
end

Instance Method Details

#configure(conf) ⇒ Object 



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# File 'lib/flydata/fluent-plugins/in_mysql_binlog_flydata.rb', line 57

def configure(conf)
  super
  @binlog_position_file = Mysql::BinLogPositionFile.new(@position_file)
  unless @binlog_position_file.exists?
    raise "No position file(#{@position_file}). Initial synchronization is required before starting."
  end
  load_custom_conf
  $log.info "mysql host:\"#{@host}\" port:\"#{@port}\" username:\"#{@username}\" database:\"#{@database}\" tables:\"#{@tables}\" tables_append_only:\"#{tables_append_only}\""
  $log.info "mysql client version: #{`mysql -V`}"
  server_version = `echo 'select version();' | MYSQL_PWD="#{@password}" mysql -h #{@host} --port #{@port} -u #{@username} 2>/dev/null`
  $log.info "mysql server version: #{server_version}"

  @tables = @tables.split(/,\s*/)
  @omit_events = Hash.new
  @tables_append_only.split(/,\s*/).each do |table|
    @tables << table unless @tables.include?(table)
    @omit_events[table] = [:delete]
  end
  @sync_fm = Flydata::FileUtil::SyncFileManager.new(nil) # Passing nil for data_entry as this class does not use methods which require data_entry

  table_meta = Mysql::TableMeta.new(
    mysql_url: mysql_url, database: @database, tables: @tables)
  table_meta.update

  @context = Mysql::Context.new(
    database: @database, tables: @tables,
    tag: @tag, sync_fm: @sync_fm, omit_events: @omit_events,
    table_meta: table_meta,
  )
  @record_dispatcher = Mysql::FlydataBinlogRecordDispatcher.new(@context)
  @idle_event_detector = IdleEventDetector.new(@initial_idle_interval, @continuous_idle_interval, @check_interval)
end

#event_listener(event) ⇒ Object 



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# File 'lib/flydata/fluent-plugins/in_mysql_binlog_flydata.rb', line 150

def event_listener(event)
  @idle_event_detector.notify
  @record_dispatcher.dispatch(event)
rescue Exception => e
  position = @binlog_position_file.read
  $log.error "error occured while processing #{event.event_type} event at #{position}\n#{e.message}\n#{$!.backtrace.join("\n")}"
  # Not reraising a StandardError because the underlying code can't handle an error well.
  raise unless e.kind_of?(StandardError)
end

#install_custom_signal_handler ⇒ Object

Hack: All that has been added here is ‘Fluent::Engine.shutdown_source`. This should be in fluentd’s supervisor#install_main_process_signal_handlers



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# File 'lib/flydata/fluent-plugins/in_mysql_binlog_flydata.rb', line 186

def install_custom_signal_handler
    trap :USR1 do
      $log.debug "fluentd main process get SIGUSR1"
      $log.info "force flushing buffered events"
      #@log.reopen!

      # Creating new thread due to mutex can't lock
      # in main thread during trap context
      Thread.new {
        begin
          Fluent::Engine.shutdown_source
          Fluent::Engine.flush!
          $log.debug "flushing thread: flushed"
        rescue Exception => e
          $log.warn "flushing thread error: #{e}"
        end
      }.run
    end
end

#run ⇒ Object 



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# File 'lib/flydata/fluent-plugins/in_mysql_binlog_flydata.rb', line 121

def run
  start_kodama(mysql_url) do |c|
    c.binlog_position_file = @position_file
    c.connection_retry_limit = @retry_limit
    c.connection_retry_wait = @retry_wait
    c.log_level = @log_level.to_sym
    @listen_events.each do |event_type|
      $log.trace { "registered binlog event listener '#{event_type}'" }
      c.send("on_#{event_type}", &method(:event_listener))
    end
  end
rescue
  $log.error "unexpected error. exception: #{$!.class.to_s}, error: #{$!.to_s}\n#{$!.backtrace.join("\n")}"
  raise
rescue SignalException
  $log.debug "signal exception. exception: #{$!.class.to_s}, error: #{$!.to_s}"
  raise
rescue Exception
  $log.error "unexpected fatal error. exception: #{$!.class.to_s}, error: #{$!.to_s}\n#{$!.backtrace.join("\n")}"
  raise
end

#shutdown ⇒ Object 



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# File 'lib/flydata/fluent-plugins/in_mysql_binlog_flydata.rb', line 160

def shutdown
  @idle_event_detector.stop
  if @thread and @thread.alive?
    $log.info "Requesting stop Kodama"
    @kodama_client.stop_request
    if wait_till_safe_to_stop
      $log.info "Killing Kodama client"
      Thread.kill(@thread)
    else
      $log.error "Unable to stop Kodama"
    end
  end
  @sync_fm.close
end

#start ⇒ Object 



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# File 'lib/flydata/fluent-plugins/in_mysql_binlog_flydata.rb', line 90

def start
  super
  @idle_event_detector.start do |reason, timestamp|
    case reason
    when :event_not_coming
      $log.warn "No binary log event since #{timestamp}"
    when :event_still_not_coming
      $log.warn "No binary log event since #{timestamp}"
    when :event_arrived_finally
      $log.info "Binary log event has come at #{timestamp}"
    end
  end

  positions_path = @context.sync_fm.table_positions_dir_path
  Dir.mkdir positions_path unless File.exists? positions_path
rescue Binlog::Error
  if (/basic_string::_M_replace_aux/ === $!.to_s)
    # TODO Fix the root cause in mysql-replication-listener
    $log.error <<EOS
a mysql-replication-listener error.  This could have been caused by one of the following reasons.
- Failed on connect: Your host is blocked because of many connection errors; unblock with 'mysqladmin flush-hosts'
EOS
  else
    $log.error "unexpected mysql-replication-listener error. exception: #{$!.class.to_s}, error: #{$!.to_s}\n#{$!.backtrace.join("\n")}"
  end
  raise
rescue Exception
  $log.error "unexpected fatal error. exception: #{$!.class.to_s}, error: #{$!.to_s}\n#{$!.backtrace.join("\n")}"
  raise
end

#start_kodama(options, &block) ⇒ Object 



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# File 'lib/flydata/fluent-plugins/in_mysql_binlog_flydata.rb', line 143

def start_kodama(options, &block)
  @kodama_client = Kodama::Client.new(Kodama::Client.mysql_url(options))
  @kodama_client.logger = $log
  block.call(@kodama_client)
  @kodama_client.start
end

#wait_till_safe_to_stop ⇒ Object 



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# File 'lib/flydata/fluent-plugins/in_mysql_binlog_flydata.rb', line 175

def wait_till_safe_to_stop
  retry_count = 5
  1.upto(retry_count) do |i|
    return true if @kodama_client.safe_to_stop?
    sleep 3
  end
  false
end