Class: Embulk::Output::Vertica

Inherits:
OutputPlugin
  • Object
show all
Defined in:
lib/embulk/output/vertica.rb,
lib/embulk/output/vertica/output_thread.rb,
lib/embulk/output/vertica/value_converter_factory.rb

Defined Under Namespace

Classes: Error, NotSupportedType, OutputThread, OutputThreadPool, ValueConverterFactory

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(task, schema, index) ⇒ Vertica

instance is created on each thread



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# File 'lib/embulk/output/vertica.rb', line 119

def initialize(task, schema, index)
  super
end

Class Method Details

.thread_pool ⇒ Object 



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# File 'lib/embulk/output/vertica.rb', line 13

def self.thread_pool
  @thread_pool ||= @thread_pool_proc.call
end

.transaction(config, schema, processor_count, &control) ⇒ Object 



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# File 'lib/embulk/output/vertica.rb', line 17

def self.transaction(config, schema, processor_count, &control)
  task = {
    'host'             => config.param('host',             :string,  :default => 'localhost'),
    'port'             => config.param('port',             :integer, :default => 5433),
    'user'             => config.param('user',             :string,  :default => nil),
    'username'         => config.param('username',         :string,  :default => nil), # alias to :user for backward compatibility
    'password'         => config.param('password',         :string,  :default => ''),
    'database'         => config.param('database',         :string,  :default => 'vdb'),
    'schema'           => config.param('schema',           :string,  :default => 'public'),
    'table'            => config.param('table',            :string),
    'mode'             => config.param('mode',             :string,  :default => 'insert'),
    'copy_mode'        => config.param('copy_mode',        :string,  :default => 'AUTO'),
    'abort_on_error'   => config.param('abort_on_error',   :bool,    :default => false),
    'compress'         => config.param('compress',         :string,  :default => 'UNCOMPRESSED'),
    'default_timezone' => config.param('default_timezone', :string, :default => 'UTC'),
    'column_options'   => config.param('column_options',   :hash,    :default => {}),
    'reject_on_materialized_type_error' => config.param('reject_on_materialized_type_error', :bool, :default => false),
    'pool'             => config.param('pool',             :integer, :default => processor_count),
  }

  @thread_pool_proc = Proc.new do
    OutputThreadPool.new(task, schema, task['pool'])
  end

  task['user'] ||= task['username']
  unless task['user']
    raise ConfigError.new 'required field "user" is not set'
  end

  task['mode'] = task['mode'].upcase
  unless %w[INSERT REPLACE].include?(task['mode'])
    raise ConfigError.new "`mode` must be one of INSERT, REPLACE"
  end

  task['copy_mode'] = task['copy_mode'].upcase
  unless %w[AUTO DIRECT TRICKLE].include?(task['copy_mode'])
    raise ConfigError.new "`copy_mode` must be one of AUTO, DIRECT, TRICKLE"
  end

  # ToDo: Support BZIP, LZO
  task['compress'] = task['compress'].upcase
  unless %w[GZIP UNCOMPRESSED].include?(task['compress'])
    raise ConfigError.new "`compress` must be one of GZIP, UNCOMPRESSED"
  end

  now = Time.now
  unique_name = "%08x%08x" % [now.tv_sec, now.tv_nsec]
  task['temp_table'] = "#{task['table']}_LOAD_TEMP_#{unique_name}"

  quoted_schema     = ::Jvertica.quote_identifier(task['schema'])
  quoted_table      = ::Jvertica.quote_identifier(task['table'])
  quoted_temp_table = ::Jvertica.quote_identifier(task['temp_table'])

  sql_schema_table = self.sql_schema_from_embulk_schema(schema, task['column_options'])

  # create the target table
  connect(task) do |jv|
    query(jv, %[DROP TABLE IF EXISTS #{quoted_schema}.#{quoted_table}]) if task['mode'] == 'REPLACE'
    query(jv, %[CREATE TABLE IF NOT EXISTS #{quoted_schema}.#{quoted_table} (#{sql_schema_table})])
  end

  sql_schema_temp_table = self.sql_schema_from_table(task)

  # create a temp table
  connect(task) do |jv|
    query(jv, %[DROP TABLE IF EXISTS #{quoted_schema}.#{quoted_temp_table}])
    query(jv, %[CREATE TABLE #{quoted_schema}.#{quoted_temp_table} (#{sql_schema_temp_table})])
    # Create internal vertica projection beforehand, otherwirse, parallel copies lock table to create a projection and we get S Lock error sometimes
    # This is a trick to create internal vertica projection
    query(jv, %[INSERT INTO #{quoted_schema}.#{quoted_temp_table} SELECT * FROM #{quoted_schema}.#{quoted_table} LIMIT 0])
    Embulk.logger.trace {
      result = query(jv, %[SELECT EXPORT_OBJECTS('', '#{task['schema']}.#{task['temp_table']}')])
      # You can see `CREATE PROJECTION` if the table has a projection
      "embulk-output-vertica: #{result.to_a.flatten}"
    }
  end

  begin
    # insert data into the temp table
    thread_pool.start
    yield(task)
    task_reports = thread_pool.commit
    Embulk.logger.info { "embulk-output-vertica: task_reports: #{task_reports.to_json}" }

    # insert select from the temp table
    connect(task) do |jv|
      query(jv, %[INSERT INTO #{quoted_schema}.#{quoted_table} SELECT * FROM #{quoted_schema}.#{quoted_temp_table}])
      jv.commit
    end
  ensure
    connect(task) do |jv|
      # clean up the temp table
      query(jv, %[DROP TABLE IF EXISTS #{quoted_schema}.#{quoted_temp_table}])
      Embulk.logger.debug { "embulk-output-vertica: select result\n#{query(jv, %[SELECT * FROM #{quoted_schema}.#{quoted_table} LIMIT 10]).map {|row| row.to_h }.join("\n") rescue nil}" }
    end
  end
  # this is for -o next_config option, add some paramters for next time execution if wants
  next_config_diff = {}
  return next_config_diff
end

Instance Method Details

#abort ⇒ Object 



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# File 'lib/embulk/output/vertica.rb', line 135

def abort
end

#add(page) ⇒ Object

called for each page in each thread



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# File 'lib/embulk/output/vertica.rb', line 128

def add(page)
  self.class.thread_pool.enqueue(page)
end

#close ⇒ Object

called for each page in each thread



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# File 'lib/embulk/output/vertica.rb', line 124

def close
end

#commit ⇒ Object

called after processing all pages in each thread we do commit on #transaction for all pools, not at here



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# File 'lib/embulk/output/vertica.rb', line 140

def commit
  {}
end

#finish ⇒ Object 



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# File 'lib/embulk/output/vertica.rb', line 132

def finish
end