class Myreplicator::MysqlExporter
Public Class Methods
# File lib/exporter/mysql_exporter.rb, line 190 def self.compare_datatypes index, vertica_schema, mysql_schema type = Myreplicator::VerticaTypes.convert mysql_schema[index]["data_type"], mysql_schema[index]["column_type"] if vertica_schema.rows[index][:data_type].downcase != type.downcase if !(vertica_schema.rows[index][:data_type].include?("timestamp")) && !(vertica_schema.rows[index][:data_type].include?("decimal")) && !(vertica_schema.rows[index][:data_type].include?("numeric")) && !(vertica_schema.rows[index][:data_type].include?("binary")) return true end return false end return false end
# File lib/exporter/mysql_exporter.rb, line 164 def self.compare_schemas vertica_schema, mysql_schema #Kernel.p vertica_schema #Kernel.p mysql_schema if vertica_schema.size != mysql_schema.size return true else index = 0 while index < vertica_schema.size # check for column name if vertica_schema.rows[index][:column_name] != mysql_schema[index]["column_name"] puts "diff" return true end # check for column's data type if compare_datatypes index, vertica_schema, mysql_schema puts "diff #{index}" return true end # and others ?? (PRIMARY, DEFAULT NULL, etc.) index += 1 end end return false end
# File lib/exporter/mysql_exporter.rb, line 204 def self.get_mysql_schema_rows mysql_schema mysql_schema_simple_form = [] mysql_schema.each(:as => :hash) do |row| mysql_schema_simple_form << row end return mysql_schema_simple_form end
# File lib/exporter/mysql_exporter.rb, line 4 def initialize *args options = args.extract_options! end
# File lib/exporter/mysql_exporter.rb, line 212 def self.schema_changed? options #Kernel.p "===== schema_changed? =====" #puts options mysql_schema = Loader.mysql_table_definition(options) vertica_schema = VerticaLoader.destination_table_vertica(options) # empty result set from vertica means table does not exist unless vertica_schema.size > 0 return {:changed => true, :mysql_schema => mysql_schema, :new => true} end # compare two schemas mysql_schema_2 = get_mysql_schema_rows mysql_schema if compare_schemas(vertica_schema, mysql_schema_2) result = {:changed => true, :mysql_schema => mysql_schema, :vertica_schema => vertica_schema,:new => false} else result = {:changed => false, :mysql_schema => mysql_schema} end #Kernel.p result return result end
Public Instance Methods
Checks the returned resut from SSH CMD Size specifies if there should be any returned results or not
# File lib/exporter/mysql_exporter.rb, line 239 def check_result result, size unless result.nil? raise Exceptions::ExportError.new("Export Error\n#{result}") if result.length > 0 end end
Executes export command via ssh on the source DB
Updates/interacts with the metadata object
# File lib/exporter/mysql_exporter.rb, line 249 def execute_export cmd, metadata metadata.store! result = "" # Execute Export command on the source DB server result = metadata.ssh.exec!(cmd) return result end
Gets an Export object and dumps the data Initially using mysqldump Incrementally using mysql -e afterwards
# File lib/exporter/mysql_exporter.rb, line 13 def export_table export_obj @export_obj = export_obj ExportMetadata.record(:table => @export_obj.table_name, :database => @export_obj.source_schema, :export_to => load_to, :export_id => @export_obj.id, :filepath => filepath, :store_in => @export_obj.s3_path, :incremental_col => @export_obj.incremental_column) do |metadata| prepare metadata if (@export_obj.export_type? == :new && load_to == "mysql") || load_to == "mysql" on_failure_state_trans(metadata, "new") # If failed, go back to new on_export_success(metadata) initial_export metadata elsif @export_obj.export_type? == :incremental || load_to == "vertica" on_failure_state_trans(metadata, "failed") # Set state trans on failure on_export_success(metadata) incremental_export_into_outfile metadata end end # metadata end
# File lib/exporter/mysql_exporter.rb, line 292 def exporting_state_trans update_export(:state => "exporting", :export_started_at => Time.now, :exporter_pid => Process.pid) end
File path on remote server
# File lib/exporter/mysql_exporter.rb, line 63 def filepath File.join(Myreplicator.configs[@export_obj.source_schema]["ssh_tmp_dir"], @export_obj.filename) end
Exports table incrementally, similar to incremental_export method Dumps file in tmp directory specified in myreplicator.yml Note that directory needs 777 permissions for mysql to be able to export the file Uses \0 as the delimiter and new line for lines
# File lib/exporter/mysql_exporter.rb, line 110 def incremental_export_into_outfile metadata unless @export_obj.is_running? if @export_obj.export_type == "incremental" max_value = @export_obj.max_value metadata.export_type = "incremental" @export_obj.update_max_val if @export_obj.max_incremental_value.blank? end if (@export_obj.export_type == "all" && @export_obj.export_to == "vertica") metadata.export_type = "incremental" end options = { :db => @export_obj.source_schema, :source_schema => @export_obj.source_schema, :table => @export_obj.table_name, :filepath => filepath, :destination_schema => @export_obj.destination_schema, :enclosed_by => Myreplicator.configs[@export_obj.source_schema]["enclosed_by"], :export_id => @export_obj.id } schema_status = Myreplicator::MysqlExporter.schema_changed?(options) Kernel.p "===== schema_status =====" Kernel.p schema_status if schema_status[:changed] # && new? metadata.export_type = "initial" else options[:incremental_col] = @export_obj.incremental_column options[:incremental_col_type] = @export_obj.incremental_column_type options[:export_type] = @export_obj.export_type options[:incremental_val] = [@export_obj.destination_max_incremental_value, @export_obj.max_incremental_value].min #options[:incremental_val] = @export_obj.max_incremental_value end #Kernel.p "===== incremental_export_into_outfile OPTIONS =====" #Kernel.p options cmd = SqlCommands.mysql_export_outfile(options) #Kernel.p "===== incremental_export_into_outfile CMD =====" #puts cmd exporting_state_trans puts "Exporting..." result = execute_export(cmd, metadata) check_result(result, 0) if @export_obj.export_type == "incremental" metadata.incremental_val = max_value # store max val in metadata @export_obj.update_max_val(max_value) # update max value if export was successful end end return false end
Exports Table using mysqldump. This method is invoked only once. Dumps with create options, no need to create table manaully
# File lib/exporter/mysql_exporter.rb, line 72 def initial_export metadata metadata.export_type = "initial" max_value = @export_obj.max_value if @export_obj.incremental_export? cmd = initial_mysqldump_cmd exporting_state_trans # mark exporting puts "Exporting..." result = execute_export(cmd, metadata) check_result(result, 0) @export_obj.update_max_val(max_value) if @export_obj.incremental_export? end
# File lib/exporter/mysql_exporter.rb, line 85 def initial_mysqldump_cmd flags = ["create-options", "single-transaction"] cmd = "" # Mysql - Mysql Export if @export_obj.export_to == "destination_db" cmd = SqlCommands.mysqldump(:db => @export_obj.source_schema, :flags => flags, :filepath => filepath, :table_name => @export_obj.table_name) else # Other destinations cmd = SqlCommands.mysql_export_outfile(:db => @export_obj.source_schema, :filepath => filepath, :table => @export_obj.table_name) end puts cmd return cmd end
# File lib/exporter/mysql_exporter.rb, line 39 def load_to if @export_obj.export_to == "vertica" return "vertica" else return "mysql" end end
# File lib/exporter/mysql_exporter.rb, line 298 def on_export_success metadata metadata.on_success do |m| zipfile(metadata) update_export(:state => "export_completed", :export_finished_at => Time.now, :error => metadata.error) metadata.state = "export_completed" end end
# File lib/exporter/mysql_exporter.rb, line 278 def on_failure_state_trans metadata, state metadata.on_failure do |m| update_export(:state => state, :export_finished_at => Time.now, :error => metadata.error) begin Myreplicator::Loader.cleanup metadata rescue Exception => e puts e.message end raise Exceptions::ExportError.new(metadata.error) end end
Setups SSH connection to remote host
# File lib/exporter/mysql_exporter.rb, line 50 def prepare metadata ssh = @export_obj.ssh_to_source metadata.ssh = ssh end
# File lib/exporter/mysql_exporter.rb, line 55 def update_export *args options = args.extract_options! @export_obj.update_attributes! options end
zips the file on the source DB
server
# File lib/exporter/mysql_exporter.rb, line 262 def zipfile metadata cmd = "cd #{Myreplicator.configs[@export_obj.source_schema]["ssh_tmp_dir"]}; gzip #{@export_obj.filename}" puts cmd zip_result = metadata.ssh.exec!(cmd) unless zip_result.nil? raise Exceptions::ExportError.new("Export Error\n#{zip_result}") if zip_result.length > 0 end metadata.zipped = true return zip_result end