Class: Fluent::MetricSenseOutput::Backends::RDBTSDBBackend

Inherits:
Fluent::MetricSenseOutput::Backend show all
Defined in:
lib/fluent/plugin/backends/rdb_tsdb_backend.rb

Constant Summary collapse

INSERT_SUPPRESS_RING_BUFFER_SIZE = 
64
ROW_TIME_WINDOW =

def shutdown end

60*24
ROW_TIME_WINDOW_BITS = 
11
ROW_TIME_WINDOW_MASK = 
(1<<ROW_TIME_WINDOW_BITS)-1

Constants inherited from Fluent::MetricSenseOutput::Backend

Fluent::MetricSenseOutput::Backend::UpdateMode

Instance Attribute Summary

Attributes inherited from Fluent::MetricSenseOutput::Backend

#log

Instance Method Summary collapse

Methods inherited from Fluent::MetricSenseOutput::Backend

#shutdown

Constructor Details

#initialize ⇒ RDBTSDBBackend

Returns a new instance of RDBTSDBBackend.



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# File 'lib/fluent/plugin/backends/rdb_tsdb_backend.rb', line 29

def initialize
  super
  require 'sequel'
  @insup_ring = []
  @insup_ring_index = 0
end

Instance Method Details

#configure(conf) ⇒ Object 



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# File 'lib/fluent/plugin/backends/rdb_tsdb_backend.rb', line 36

def configure(conf)
  super

  @rdb_read_url ||= @rdb_url

  @metric_tag_table = "#{@rdb_table_prefix}_metric_tags"
  @segment_value_table = "#{@rdb_table_prefix}_segment_values"
  @data_table = "#{@rdb_table_prefix}_data"
  @metric_view = "#{@rdb_table_prefix}_metrics"
  @metric_json_view = "#{@rdb_table_prefix}_json"

  #sql_standard_concat = lambda {|array| array.join(' || ') }
  #sql_standard_surround = lambda {|expr| "'\"' || #{expr} || '\"'" }

  case @rdb_url
  when /^mysql/i
    @sql_type = :mysql
    @sql_autoincr_type = "INT"
    @sql_autoincr_ref_type = "INT"
    @sql_autoincr_suffix = " AUTO_INCREMENT"
    @sql_value_type = "SMALLINT"
    @sql_name_type = "VARCHAR(255)"
    @sql_time_type = "INT"
    @sql_insert_ignore = "INSERT IGNORE"
    @sql_insert_returns_last_id = true
    #@sql_concat = lambda {|array| "CONCAT(#{array.join(', ')})" }
    #@sql_surround = lambda {|expr| "CONCAT('\"', #{expr}, '\"')" }
  when /^postgres/i
    @sql_type = :postgresql
    @sql_autoincr_type = "SERIAL"
    @sql_autoincr_ref_type = "INT"
    @sql_autoincr_suffix = ""
    @sql_value_type = "SMALLINT"
    @sql_name_type = "VARCHAR(255)"
    @sql_time_type = "INT"
    @sql_insert_ignore = "INSERT"
    @sql_insert_returns_last_id = false
    #@sql_concat = sql_standard_concat
    #@sql_surround = sql_standard_surround
  when /^sqlite/i
    @sql_type = :sqlite
    @sql_autoincr_type = "INTEGER"
    @sql_autoincr_ref_type = "INTEGER"
    @sql_autoincr_suffix = " AUTOINCREMENT"
    @sql_value_type = "INTEGER"
    @sql_name_type = "TEXT"
    @sql_time_type = "INTEGER"
    @sql_insert_ignore = "INSERT OR IGNORE"
    @sql_insert_returns_last_id = false
    #@sql_concat = sql_standard_concat
    #@sql_surround = sql_standard_surround
  else
    @sql_type = :unknown
    @sql_autoincr_type = "INT"
    @sql_autoincr_ref_type = "INT"
    @sql_autoincr_suffix = " AUTO_INCREMENT"
    @sql_value_type = "SMALLINT"
    @sql_name_type = "VARCHAR(255)"
    @sql_time_type = "INT"
    @sql_insert_ignore = "INSERT IGNORE"
    @sql_insert_returns_last_id = false
    #@sql_concat = sql_standard_concat
    #@sql_surround = sql_standard_surround
  end
end

#ensure_connect(&block) ⇒ Object 



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# File 'lib/fluent/plugin/backends/rdb_tsdb_backend.rb', line 296

def ensure_connect(&block)
  db = Sequel.connect(@rdb_url, :max_connections=>1)
  begin
    block.call(db)
  ensure
    db.disconnect
  end
end

#get_metric_id(db, tag, seg_key) ⇒ Object 



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# File 'lib/fluent/plugin/backends/rdb_tsdb_backend.rb', line 252

def get_metric_id(db, tag, seg_key)
  key = "#{tag}\0#{seg_key}"
  id = @metric_names[key]
  return id if id

  begin
    id = db["INSERT INTO `#{@metric_tag_table}` (metric_name,segment_name) VALUES (?,?)", tag, seg_key||''].update
    if @sql_insert_returns_last_id
      @metric_names[key] = id
      return id
    end
    reload_metric_names!(db)
    return @metric_names[key]

  rescue => e
    reload_metric_names!(db)
    id = @metric_names[key]
    return id if id
    raise e
  end
end

#get_segment_id(db, seg_val) ⇒ Object 



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# File 'lib/fluent/plugin/backends/rdb_tsdb_backend.rb', line 274

def get_segment_id(db, seg_val)
  key = seg_val ? seg_val.to_s : ''
  id = @segment_names[key]
  return id if id

  begin
    id = db["INSERT INTO `#{@segment_value_table}` (name) VALUES (?)", key].update
    if @sql_insert_returns_last_id
      @segment_names[key] = id
      return id
    end
    reload_segment_names!(db)
    return @segment_names[key]

  rescue => e
    reload_segment_names!(db)
    id = @segment_names[key]
    return id if id
    raise e
  end
end

#reload_metric_names!(db) ⇒ Object 



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# File 'lib/fluent/plugin/backends/rdb_tsdb_backend.rb', line 235

def reload_metric_names!(db)
  map = {}
  db.fetch("SELECT id, metric_name, segment_name FROM `#{@metric_tag_table}`") {|row|
    key = "#{row[:metric_name]}\0#{row[:segment_name]}"
    map[key] = row[:id]
  }
  @metric_names = map
end

#reload_segment_names!(db) ⇒ Object 



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# File 'lib/fluent/plugin/backends/rdb_tsdb_backend.rb', line 244

def reload_segment_names!(db)
  map = {}
  db.fetch("SELECT id, name FROM `#{@segment_value_table}`") {|row|
    map[row[:name]] = row[:id]
  }
  @segment_names = map
end

#start ⇒ Object 



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# File 'lib/fluent/plugin/backends/rdb_tsdb_backend.rb', line 102

def start
  ensure_connect do |db|
    db.run %[
      CREATE TABLE IF NOT EXISTS `#{@metric_tag_table}` (
        id #{@sql_autoincr_type} PRIMARY KEY#{@sql_autoincr_suffix},
        metric_name #{@sql_name_type} NOT NULL,
        segment_name #{@sql_name_type} NOT NULL,
        UNIQUE (metric_name, segment_name)
      );]

    db.run %[
      CREATE TABLE IF NOT EXISTS `#{@segment_value_table}` (
        id #{@sql_autoincr_type} PRIMARY KEY#{@sql_autoincr_suffix},
        name #{@sql_name_type} NOT NULL,
        UNIQUE (name)
      );]

    minutes = (0..59).to_a.map {|m| "m#{m} #{@sql_value_type} NOT NULL DEFAULT 0" }.join(', ')
    db.run %[
      CREATE TABLE IF NOT EXISTS `#{@data_table}` (
        base_time #{@sql_time_type} NOT NULL,
        metric_id #{@sql_autoincr_ref_type} NOT NULL,
        segment_id #{@sql_autoincr_ref_type},
        #{minutes},
        PRIMARY KEY (base_time, metric_id, segment_id)
      );]

    if @sql_type == :postgresql
      # ignore duplication error on data_table
      db.run %[
        CREATE OR REPLACE RULE ignore_duplicated_insert AS ON INSERT TO `#{@data_table}`
        WHERE NEW.base_time = OLD.base_time AND NEW.metric_id = OLD.metric_id AND NEW.segment_id = OLD.segment_id
        DO INSTEAD NOTHING;]
    end

    #minutes = (0..59).to_a.map {|m| "m#{m}" }.join(', ')
    #db.run %[
    #  CREATE VIEW IF NOT EXISTS `#{@metric_view}` AS
    #  SELECT
    #    base_time * 60 AS time,
    #    M.metric_name AS metric_name,
    #    CASE M.segment_name WHEN '' THEN NULL ELSE M.segment_name END AS segment_name,
    #    S.name AS segment_value,
    #    #{minutes}
    #  FROM `#{@data_table}` T
    #  LEFT JOIN `#{@metric_tag_table}` M ON T.metric_id = M.id
    #  LEFT JOIN `#{@segment_value_table}` S ON T.segment_id = S.id;]

    #minutes = (0..59).to_a.map {|m| ["m#{m}", "','"] }.flatten!
    #minutes.pop
    #minutes = @sql_concat.call(["'['"]+minutes+["']'"])
    #db.run %[
    #  CREATE VIEW IF NOT EXISTS `#{@metric_json_view}` AS
    #  SELECT
    #    base_time * 60 AS time,
    #    #{@sql_surround.call("M.metric_name")} AS metric_name,
    #    CASE WHEN M.segment_name IS NULL OR M.segment_name = '' THEN 'null' ELSE #{@sql_surround.call("M.segment_name")} END AS segment_name,
    #    CASE WHEN S.name IS NULL OR S.name = '' THEN 'null' ELSE #{@sql_surround.call("S.name")} END AS segment_value,
    #    #{minutes}
    #  FROM `#{@data_table}` T
    #  LEFT JOIN `#{@metric_tag_table}` M ON T.metric_id = M.id
    #  LEFT JOIN `#{@segment_value_table}` S ON T.segment_id = S.id;]

    reload_metric_names!(db)
    reload_segment_names!(db)
  end
end

#write(data) ⇒ Object 



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# File 'lib/fluent/plugin/backends/rdb_tsdb_backend.rb', line 177

def write(data)
  ensure_connect do |db|
    # group by row_key (base_time,metric_id,segment_id)
    rows = {}
    data.each {|tag,time,value,seg_key,seg_val,mode|
      # TODO update_mode is not supported yet
      base_time = time / ROW_TIME_WINDOW
      metric_id = get_metric_id(db, tag, seg_key)
      segment_id = get_segment_id(db, seg_val) if seg_val

      row_key = [base_time, metric_id, segment_id]
      minutes = (rows[row_key] ||= [])
      minutes << ((value << ROW_TIME_WINDOW_BITS) | (time % 60))
    }

    # insert rows if not exist
    if @sql_type == :sqlite
      # sqlite3 < 1.3.7 doesn't allow multiple rows at once
      rows.keys.each {|row_key|
        next if @insup_ring.include?(row_key)
        db["#{@sql_insert_ignore} INTO `#{@data_table}` (base_time,metric_id,segment_id) VALUES (?,?,?)", *row_key].update
        rid = @insup_ring_index = (@insup_ring_index + 1) % INSERT_SUPPRESS_RING_BUFFER_SIZE
        @insup_ring[rid] = row_key
      }
    else
      insert_sql = "#{@sql_insert_ignore} INTO `#{@data_table}` (base_time,metric_id,segment_id) VALUES " + (["(?,?,?)"] * rows.size).join(', ')
      insert_params = [insert_sql]
      rows.keys.each {|row_key|
        next if @insup_ring.include?(row_key)
        insert_params.concat(row_key)
        rid = @insup_ring_index = (@insup_ring_index + 1) % INSERT_SUPPRESS_RING_BUFFER_SIZE
        @insup_ring[rid] = row_key
      }
      db[*insert_params].update
    end

    # increment values
    db.transaction do
      rows.each_pair {|row_key,minutes|
        update_sql = "UPDATE `#{@data_table}` SET "
        update_params = [update_sql]

        values_sql = []
        minutes.each {|m|
          value = m >> ROW_TIME_WINDOW_BITS
          minute = m & ROW_TIME_WINDOW_MASK
          values_sql << "m#{minute} = m#{minute} + ?"
          update_params << value
        }.join(', ')
        update_sql << values_sql.join(', ') << " WHERE base_time=? AND metric_id=? AND segment_id=?"
        update_params.concat(row_key)

        db[*update_params].update
      }
    end
  end
end