Class: ActiveRecord::ConnectionAdapters::HypertableAdapter
- Inherits:
-
AbstractAdapter
- Object
- AbstractAdapter
- ActiveRecord::ConnectionAdapters::HypertableAdapter
- Defined in:
- lib/active_record/connection_adapters/hypertable_adapter.rb
Constant Summary collapse
- @@read_latency =
Following cattr_accessors are used to record and access query performance statistics.
0.0
- @@write_latency =
0.0
- @@cells_read =
0
Instance Attribute Summary collapse
-
#retry_on_failure ⇒ Object
Returns the value of attribute retry_on_failure.
Class Method Summary collapse
-
.get_timing ⇒ Object
Return the current set of performance statistics.
-
.reset_timing ⇒ Object
Reset performance metrics.
Instance Method Summary collapse
- #adapter_name ⇒ Object
- #add_column(table_name, column_name, type = :string, options = {}) ⇒ Object
- #add_column_options!(hql, options) ⇒ Object
- #add_column_to_name_map(table_name, name) ⇒ Object
- #add_qualified_column(table_name, column_family, qualifiers = [], default = '', sql_type = nil, null = true) ⇒ Object
-
#cell_native_array(row_key, column_family, column_qualifier, value = nil, timestamp = nil) ⇒ Object
Create native array format for cell.
- #change_column(table_name, column_name, new_column_name) ⇒ Object
- #change_column_default(table_name, column_name, default) ⇒ Object
- #change_column_null(table_name, column_name, null, default = nil) ⇒ Object
-
#close_mutator(mutator, flush = 0) ⇒ Object
Flush is always called in a mutator’s destructor due to recent no_log_sync changes.
- #close_scanner(scanner) ⇒ Object
-
#columns(table_name, name = nil) ⇒ Object
Returns array of column objects for the table associated with this class.
-
#convert_options_to_scan_spec(options = {}) ⇒ Object
Convert an options hash to a scan spec.
- #create_table(table_name, options = {}, &block) ⇒ Object
-
#create_table_hql(table_name, options = {}) {|table_definition| ... } ⇒ Object
Translate “sexy” ActiveRecord::Migration syntax to an HQL CREATE TABLE statement.
-
#delete_cells(table_name, cells) ⇒ Object
Delete cells from a table.
-
#delete_rows(table_name, row_keys) ⇒ Object
Delete rows from a table.
-
#describe_table(table_name) ⇒ Object
Return an XML document describing the table named in the first argument.
- #drop_table(table_name, options = {}) ⇒ Object
-
#each_cell(scanner, &block) ⇒ Object
Iterator methods.
- #each_cell_as_arrays(scanner, &block) ⇒ Object
- #each_row(scanner, &block) ⇒ Object
- #each_row_as_arrays(scanner, &block) ⇒ Object
-
#execute(hql, options = {}) ⇒ Object
Execute an HQL query against Hypertable and return the native HqlResult object that comes back from the Thrift client API.
-
#execute_with_options(options) ⇒ Object
Execute a query against Hypertable and return the matching cells.
- #flush_mutator(mutator) ⇒ Object
-
#handle_thrift_exceptions_with_missing_message ⇒ Object
Exceptions generated by Thrift IDL do not set a message.
- #hypertable_column_name(name, table_name, declared_columns_only = false) ⇒ Object
-
#initialize(connection, logger, config) ⇒ HypertableAdapter
constructor
A new instance of HypertableAdapter.
-
#insert_fixture(fixture, table_name) ⇒ Object
Insert a test fixture into a table.
- #is_qualified_column_name?(column_name) ⇒ Boolean
-
#native_database_types ⇒ Object
Hypertable only supports string types at the moment, so treat all values as strings and leave it to the application to handle types.
- #new_column(column_name, default_value = '') ⇒ Object
-
#open_mutator(table_name, flags = 0, flush_interval = 0) ⇒ Object
Mutator methods.
-
#open_scanner(table_name, scan_spec) ⇒ Object
Scanner methods.
- #qualified_column_name(column_family, qualifier = nil) ⇒ Object
- #quote(value, column = nil) ⇒ Object
- #quote_column_name(name) ⇒ Object
- #quote_column_name_for_table(name, table_name) ⇒ Object
- #raw_thrift_client(&block) ⇒ Object
- #remove_column(table_name, *column_names) ⇒ Object (also: #remove_columns)
- #remove_column_from_name_map(table_name, name) ⇒ Object
-
#rename_column(table_name, column_name, new_column_name) ⇒ Object
Schema alterations.
- #rename_table(table_name, options = {}) ⇒ Object
- #requested_columns_from_string(s) ⇒ Object
-
#retry_on_connection_error ⇒ Object
Attempt to reconnect to the Thrift Broker once before aborting.
- #rubify_column_name(column_name) ⇒ Object
- #sanitize_conditions(options) ⇒ Object
- #supports_migrations? ⇒ Boolean
-
#tables(name = nil) ⇒ Object
Returns an array of tables available in the current Hypertable instance.
-
#thrift_cell_from_native_array(array) ⇒ Object
Return a Hypertable::ThriftGen::Cell object from a cell passed in as an array of format: [row_key, column_name, value] Hypertable::ThriftGen::Cell objects are required when setting a flag on write - used by special operations (e.g,. delete ).
- #with_scanner(table_name, scan_spec, &block) ⇒ Object
-
#write_cells(table_name, cells, options = {}) ⇒ Object
Write an array of cells to the named table.
Constructor Details
#initialize(connection, logger, config) ⇒ HypertableAdapter
Returns a new instance of HypertableAdapter.
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# File 'lib/active_record/connection_adapters/hypertable_adapter.rb', line 79 def initialize(connection, logger, config) super(connection, logger) @config = config @hypertable_column_names = {} if connection @namespace = connection.open_namespace(@config[:namespace]) end end |
Instance Attribute Details
#retry_on_failure ⇒ Object
Returns the value of attribute retry_on_failure.
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# File 'lib/active_record/connection_adapters/hypertable_adapter.rb', line 77 def retry_on_failure @retry_on_failure end |
Class Method Details
.get_timing ⇒ Object
Return the current set of performance statistics. The application can retrieve (and reset) these statistics after every query or request for its own logging purposes.
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# File 'lib/active_record/connection_adapters/hypertable_adapter.rb', line 99 def self.get_timing [@@read_latency, @@write_latency, @@cells_read] end |
.reset_timing ⇒ Object
Reset performance metrics.
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# File 'lib/active_record/connection_adapters/hypertable_adapter.rb', line 104 def self.reset_timing @@read_latency = 0.0 @@write_latency = 0.0 @@cells_read = 0 end |
Instance Method Details
#adapter_name ⇒ Object
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# File 'lib/active_record/connection_adapters/hypertable_adapter.rb', line 110 def adapter_name 'Hypertable' end |
#add_column(table_name, column_name, type = :string, options = {}) ⇒ Object
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# File 'lib/active_record/connection_adapters/hypertable_adapter.rb', line 451 def add_column(table_name, column_name, type=:string, = {}) hql = [ "ALTER TABLE #{quote_table_name(table_name)} ADD (" ] hql << quote_column_name(column_name) hql << "MAX_VERSIONS=#{[:max_versions]}" if ![:max_versions].blank? hql << ")" execute(hql.join(' ')) end |
#add_column_options!(hql, options) ⇒ Object
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# File 'lib/active_record/connection_adapters/hypertable_adapter.rb', line 459 def (hql, ) hql << " MAX_VERSIONS =1 #{quote([:default], [:column])}" if () # must explicitly check for :null to allow change_column to work on migrations if [:null] == false hql << " NOT NULL" end end |
#add_column_to_name_map(table_name, name) ⇒ Object
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# File 'lib/active_record/connection_adapters/hypertable_adapter.rb', line 361 def add_column_to_name_map(table_name, name) @hypertable_column_names[table_name][rubify_column_name(name)] = name end |
#add_qualified_column(table_name, column_family, qualifiers = [], default = '', sql_type = nil, null = true) ⇒ Object
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# File 'lib/active_record/connection_adapters/hypertable_adapter.rb', line 365 def add_qualified_column(table_name, column_family, qualifiers=[], default='', sql_type=nil, null=true) qc = QualifiedColumn.new(column_family, default, sql_type, null) qc.qualifiers = qualifiers qualifiers.each{|q| add_column_to_name_map(table_name, qualified_column_name(column_family, q))} qc end |
#cell_native_array(row_key, column_family, column_qualifier, value = nil, timestamp = nil) ⇒ Object
Create native array format for cell. Most HyperRecord operations deal with cells in native array format since operations on an array are much faster than operations on Hypertable::ThriftGen::Cell objects. [“row_key”, “column_family”, “column_qualifier”, “value”],
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# File 'lib/active_record/connection_adapters/hypertable_adapter.rb', line 595 def cell_native_array(row_key, column_family, column_qualifier, value=nil, =nil) [ row_key.to_s, column_family.to_s, column_qualifier.to_s, value.to_s ].map do |s| s.respond_to?(:force_encoding) ? s.force_encoding('ascii-8bit') : s end end |
#change_column(table_name, column_name, new_column_name) ⇒ Object
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# File 'lib/active_record/connection_adapters/hypertable_adapter.rb', line 399 def change_column(table_name, column_name, new_column_name) raise "change_column operation not supported by Hypertable." end |
#change_column_default(table_name, column_name, default) ⇒ Object
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# File 'lib/active_record/connection_adapters/hypertable_adapter.rb', line 443 def change_column_default(table_name, column_name, default) raise "change_column_default operation not supported by Hypertable." end |
#change_column_null(table_name, column_name, null, default = nil) ⇒ Object
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# File 'lib/active_record/connection_adapters/hypertable_adapter.rb', line 447 def change_column_null(table_name, column_name, null, default = nil) raise "change_column_null operation not supported by Hypertable." end |
#close_mutator(mutator, flush = 0) ⇒ Object
Flush is always called in a mutator’s destructor due to recent no_log_sync changes. Adding an explicit flush here just adds one round trip for an extra flush call, so change the default to flush=0. Consider removing this argument and always sending 0.
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# File 'lib/active_record/connection_adapters/hypertable_adapter.rb', line 667 def close_mutator(mutator, flush=0) @connection.close_mutator(mutator, flush) end |
#close_scanner(scanner) ⇒ Object
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# File 'lib/active_record/connection_adapters/hypertable_adapter.rb', line 681 def close_scanner(scanner) @connection.close_scanner(scanner) end |
#columns(table_name, name = nil) ⇒ Object
Returns array of column objects for the table associated with this class. Hypertable allows columns to include dashes in the name.
This doesn’t play well with Ruby (can’t have dashes in method names), so we maintain a mapping of original column names to Ruby-safe names.
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# File 'lib/active_record/connection_adapters/hypertable_adapter.rb', line 332 def columns(table_name, name = nil) # Each table always has a row key called 'ROW' columns = [ Column.new('ROW', '') ] schema = describe_table(table_name) doc = REXML::Document.new(schema) column_families = doc.each_element('Schema/AccessGroup/ColumnFamily') { |cf| cf } @hypertable_column_names[table_name] ||= {} for cf in column_families # Columns are lazily-deleted in Hypertable so still may show up # in describe table output. Ignore. del = cf.elements['deleted'] deleted = del ? del.text : 'false' next if deleted == 'true' column_name = cf.elements['Name'].text rubified_name = rubify_column_name(column_name) @hypertable_column_names[table_name][rubified_name] = column_name columns << new_column(rubified_name, '') end columns end |
#convert_options_to_scan_spec(options = {}) ⇒ Object
Convert an options hash to a scan spec. A scan spec is native representation of the query parameters that must be sent to Hypertable. hypertable.org/thrift-api-ref/Client.html#Struct_ScanSpec
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# File 'lib/active_record/connection_adapters/hypertable_adapter.rb', line 182 def (={}) sanitize_conditions() # Rows can be specified using a number of different options: # :row_keys => [row_key_1, row_key_2, ...] # :start_row and :end_row # :row_intervals => [[start_1, end_1], [start_2, end_2]] row_intervals = [] [:start_inclusive] = .has_key?(:start_inclusive) ? [:start_inclusive] : true [:end_inclusive] = .has_key?(:end_inclusive) ? [:end_inclusive] : true if [:row_keys] [:row_keys].flatten.each do |rk| row_intervals << [rk, rk] end elsif [:row_intervals] [:row_intervals].each do |ri| row_intervals << [ri.first, ri.last] end elsif [:start_row] raise "missing :end_row" if ![:end_row] row_intervals << [[:start_row], [:end_row]] end # Add each row interval to the scan spec [:row_intervals] = row_intervals.map do |row_interval| ri = Hypertable::ThriftGen::RowInterval.new ri.start_row = row_interval.first ri.start_inclusive = [:start_inclusive] ri.end_row = row_interval.last ri.end_inclusive = [:end_inclusive] ri end scan_spec = Hypertable::ThriftGen::ScanSpec.new # Hypertable can store multiple revisions for each cell but this # feature does not map into an ORM very well. By default, just # retrieve the latest revision of each cell. Since this is most # common config when using HyperRecord, tables should be defined # with MAX_VERSIONS=1 at creation time to save space and reduce # query time. [:revs] ||= 1 # Most of the time, we're not interested in cells that have been # marked deleted but have not actually been deleted yet. [:return_deletes] ||= false for key in .keys case key.to_sym when :row_intervals scan_spec.row_intervals = [key] when :cell_intervals scan_spec.cell_intervals = [key] when :start_time scan_spec.start_time = [key] when :end_time scan_spec.end_time = [key] when :limit scan_spec.row_limit = [key] when :revs scan_spec.revs = [key] when :return_deletes scan_spec.return_deletes = [key] when :select # Columns listed here can only be column families (not # column qualifiers) at this time. requested_columns = if [key].is_a?(String) requested_columns_from_string([key]) elsif [key].is_a?(Symbol) requested_columns_from_string([key].to_s) elsif [key].is_a?(Array) [key].map{|k| k.to_s} else [key] end scan_spec.columns = requested_columns.map do |column| status, family, qualifier = is_qualified_column_name?(column) family end.uniq when :table_name, :start_row, :end_row, :start_inclusive, :end_inclusive, :select, :columns, :row_keys, :conditions, :include, :readonly, :scan_spec, :instantiate_only_requested_columns # ignore else raise "Unrecognized scan spec option: #{key}" end end scan_spec end |
#create_table(table_name, options = {}, &block) ⇒ Object
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# File 'lib/active_record/connection_adapters/hypertable_adapter.rb', line 428 def create_table(table_name, ={}, &block) execute(create_table_hql(table_name, , &block)) end |
#create_table_hql(table_name, options = {}) {|table_definition| ... } ⇒ Object
Translate “sexy” ActiveRecord::Migration syntax to an HQL CREATE TABLE statement.
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# File 'lib/active_record/connection_adapters/hypertable_adapter.rb', line 405 def create_table_hql(table_name, ={}, &block) table_definition = HyperTableDefinition.new(self) yield table_definition if [:force] && table_exists?(table_name) drop_table(table_name, ) end create_sql = [ "CREATE TABLE #{quote_table_name(table_name)} (" ] column_sql = [] for col in table_definition.columns column_sql << [ quote_table_name(col.name), col.max_versions ? "MAX_VERSIONS=#{col.max_versions}" : '' ].join(' ') end create_sql << column_sql.join(', ') create_sql << ") #{[:options]}" create_sql.join(' ').strip end |
#delete_cells(table_name, cells) ⇒ Object
Delete cells from a table.
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# File 'lib/active_record/connection_adapters/hypertable_adapter.rb', line 607 def delete_cells(table_name, cells) t1 = Time.now retry_on_connection_error { @connection.with_mutator(@namespace, table_name) do |mutator| thrift_cells = cells.map{|c| cell = thrift_cell_from_native_array(c) cell.key.flag = Hypertable::ThriftGen::KeyFlag::DELETE_CELL cell } @connection.set_cells(mutator, thrift_cells) end } @@write_latency += Time.now - t1 end |
#delete_rows(table_name, row_keys) ⇒ Object
Delete rows from a table.
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# File 'lib/active_record/connection_adapters/hypertable_adapter.rb', line 625 def delete_rows(table_name, row_keys) t1 = Time.now cells = row_keys.map do |row_key| cell = Hypertable::ThriftGen::Cell.new cell.key = Hypertable::ThriftGen::Key.new cell.key.row = row_key cell.key.flag = Hypertable::ThriftGen::KeyFlag::DELETE_ROW cell end retry_on_connection_error { @connection.with_mutator(@namespace, table_name) do |mutator| @connection.set_cells(mutator, cells) end } @@write_latency += Time.now - t1 end |
#describe_table(table_name) ⇒ Object
Return an XML document describing the table named in the first argument. Output is equivalent to that returned by the DESCRIBE TABLE command available in the Hypertable CLI. <Schema generation=“2”>
<AccessGroup name="default">
<ColumnFamily id="1">
<Generation>1</Generation>
<Name>date</Name>
<deleted>false</deleted>
</ColumnFamily>
</AccessGroup>
</Schema>
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# File 'lib/active_record/connection_adapters/hypertable_adapter.rb', line 519 def describe_table(table_name) retry_on_connection_error { @connection.get_schema_str(@namespace, table_name) } end |
#drop_table(table_name, options = {}) ⇒ Object
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# File 'lib/active_record/connection_adapters/hypertable_adapter.rb', line 432 def drop_table(table_name, = {}) retry_on_connection_error { @connection.drop_table(@namespace, table_name, [:if_exists] || false) } end |
#each_cell(scanner, &block) ⇒ Object
Iterator methods
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# File 'lib/active_record/connection_adapters/hypertable_adapter.rb', line 691 def each_cell(scanner, &block) @connection.each_cell(scanner, &block) end |
#each_cell_as_arrays(scanner, &block) ⇒ Object
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# File 'lib/active_record/connection_adapters/hypertable_adapter.rb', line 695 def each_cell_as_arrays(scanner, &block) @connection.each_cell_as_arrays(scanner, &block) end |
#each_row(scanner, &block) ⇒ Object
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# File 'lib/active_record/connection_adapters/hypertable_adapter.rb', line 699 def each_row(scanner, &block) @connection.each_row(scanner, &block) end |
#each_row_as_arrays(scanner, &block) ⇒ Object
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# File 'lib/active_record/connection_adapters/hypertable_adapter.rb', line 703 def each_row_as_arrays(scanner, &block) @connection.each_row_as_arrays(scanner, &block) end |
#execute(hql, options = {}) ⇒ Object
Execute an HQL query against Hypertable and return the native HqlResult object that comes back from the Thrift client API.
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# File 'lib/active_record/connection_adapters/hypertable_adapter.rb', line 141 def execute(hql, ={}) log(hql, [:name]) { retry_on_connection_error { @connection.hql_query(@namespace, hql) } } end |
#execute_with_options(options) ⇒ Object
Execute a query against Hypertable and return the matching cells. The query parameters are denoted in an options hash, which is converted to a “scan spec” by convert_options_to_scan_spec. A “scan spec” is the mechanism used to specify query parameters (e.g., the columns to retrieve, the number of rows to retrieve, etc.) to Hypertable.
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# File 'lib/active_record/connection_adapters/hypertable_adapter.rb', line 155 def () scan_spec = () t1 = Time.now # Use native array method (get_cells_as_arrays) for cell retrieval - # much faster than get_cells that returns Hypertable::ThriftGen::Cell # objects. # [ # ["page_1", "name", "", "LOLcats and more", "1237331693147619001"], # ["page_1", "url", "", "http://...", "1237331693147619002"] # ] cells = retry_on_connection_error { @connection.get_cells_as_arrays(@namespace, [:table_name], scan_spec) } # Capture performance metrics @@read_latency += Time.now - t1 @@cells_read += cells.length cells end |
#flush_mutator(mutator) ⇒ Object
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# File 'lib/active_record/connection_adapters/hypertable_adapter.rb', line 671 def flush_mutator(mutator) @connection.flush_mutator(mutator) end |
#handle_thrift_exceptions_with_missing_message ⇒ Object
Exceptions generated by Thrift IDL do not set a message. This causes a lot of problems for Rails which expects a String value and throws exception when it encounters NilClass. Unfortunately, you cannot assign a message to exceptions so define a singleton to accomplish same goal.
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# File 'lib/active_record/connection_adapters/hypertable_adapter.rb', line 287 def begin yield rescue Exception => err if !err. if err.respond_to?("message=") err. = err.what || '' else def err. self.what || '' end end end raise err end end |
#hypertable_column_name(name, table_name, declared_columns_only = false) ⇒ Object
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# File 'lib/active_record/connection_adapters/hypertable_adapter.rb', line 490 def hypertable_column_name(name, table_name, declared_columns_only=false) begin columns(table_name) if @hypertable_column_names[table_name].blank? n = @hypertable_column_names[table_name][name] n ||= name if !declared_columns_only n rescue Exception => err raise [ "hypertable_column_name exception", err., "table: #{table_name}", "column: #{name}", "@htcn: #{pp @hypertable_column_names}" ].join("\n") end end |
#insert_fixture(fixture, table_name) ⇒ Object
Insert a test fixture into a table.
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# File 'lib/active_record/connection_adapters/hypertable_adapter.rb', line 645 def insert_fixture(fixture, table_name) fixture_hash = fixture.to_hash = fixture_hash.delete('timestamp') row_key = fixture_hash.delete('ROW') cells = [] fixture_hash.keys.each do |k| column_name, column_family = k.split(':', 2) cells << cell_native_array(row_key, column_name, column_family, fixture_hash[k], ) end write_cells(table_name, cells) end |
#is_qualified_column_name?(column_name) ⇒ Boolean
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# File 'lib/active_record/connection_adapters/hypertable_adapter.rb', line 384 def is_qualified_column_name?(column_name) column_family, qualifier = column_name.split(':', 2) if qualifier [true, column_family, qualifier] else [false, column_name, nil] end end |
#native_database_types ⇒ Object
Hypertable only supports string types at the moment, so treat all values as strings and leave it to the application to handle types.
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# File 'lib/active_record/connection_adapters/hypertable_adapter.rb', line 121 def native_database_types { :string => { :name => "varchar", :limit => 255 } } end |
#new_column(column_name, default_value = '') ⇒ Object
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# File 'lib/active_record/connection_adapters/hypertable_adapter.rb', line 372 def new_column(column_name, default_value='') Column.new(rubify_column_name(column_name), default_value) end |
#open_mutator(table_name, flags = 0, flush_interval = 0) ⇒ Object
Mutator methods
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# File 'lib/active_record/connection_adapters/hypertable_adapter.rb', line 659 def open_mutator(table_name, flags=0, flush_interval=0) @connection.open_mutator(@namespace, table_name, flags, flush_interval) end |
#open_scanner(table_name, scan_spec) ⇒ Object
Scanner methods
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# File 'lib/active_record/connection_adapters/hypertable_adapter.rb', line 677 def open_scanner(table_name, scan_spec) @connection.open_scanner(@namespace, table_name, scan_spec, true) end |
#qualified_column_name(column_family, qualifier = nil) ⇒ Object
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# File 'lib/active_record/connection_adapters/hypertable_adapter.rb', line 376 def qualified_column_name(column_family, qualifier=nil) [column_family, qualifier].compact.join(':') end |
#quote(value, column = nil) ⇒ Object
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# File 'lib/active_record/connection_adapters/hypertable_adapter.rb', line 474 def quote(value, column = nil) case value when NilClass then '' when String then value else super(value, column) end end |
#quote_column_name(name) ⇒ Object
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# File 'lib/active_record/connection_adapters/hypertable_adapter.rb', line 482 def quote_column_name(name) "'#{name}'" end |
#quote_column_name_for_table(name, table_name) ⇒ Object
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# File 'lib/active_record/connection_adapters/hypertable_adapter.rb', line 486 def quote_column_name_for_table(name, table_name) quote_column_name(hypertable_column_name(name, table_name)) end |
#raw_thrift_client(&block) ⇒ Object
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# File 'lib/active_record/connection_adapters/hypertable_adapter.rb', line 88 def raw_thrift_client(&block) t1 = Time.now results = Hypertable.with_thrift_client(@config[:host], @config[:port], @config[:timeout], &block) @@read_latency += Time.now - t1 results end |
#remove_column(table_name, *column_names) ⇒ Object Also known as: remove_columns
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# File 'lib/active_record/connection_adapters/hypertable_adapter.rb', line 467 def remove_column(table_name, *column_names) column_names.flatten.each do |column_name| execute "ALTER TABLE #{quote_table_name(table_name)} DROP(#{quote_column_name(column_name)})" end end |
#remove_column_from_name_map(table_name, name) ⇒ Object
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# File 'lib/active_record/connection_adapters/hypertable_adapter.rb', line 357 def remove_column_from_name_map(table_name, name) @hypertable_column_names[table_name].delete(rubify_column_name(name)) end |
#rename_column(table_name, column_name, new_column_name) ⇒ Object
Schema alterations
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# File 'lib/active_record/connection_adapters/hypertable_adapter.rb', line 395 def rename_column(table_name, column_name, new_column_name) raise "rename_column operation not supported by Hypertable." end |
#rename_table(table_name, options = {}) ⇒ Object
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# File 'lib/active_record/connection_adapters/hypertable_adapter.rb', line 439 def rename_table(table_name, = {}) raise "rename_table operation not supported by Hypertable." end |
#requested_columns_from_string(s) ⇒ Object
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# File 'lib/active_record/connection_adapters/hypertable_adapter.rb', line 274 def requested_columns_from_string(s) if s == '*' [] else s.split(',').map{|s| s.strip} end end |
#retry_on_connection_error ⇒ Object
Attempt to reconnect to the Thrift Broker once before aborting. This ensures graceful recovery in the case that the Thrift Broker goes down and then comes back up.
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# File 'lib/active_record/connection_adapters/hypertable_adapter.rb', line 308 def retry_on_connection_error @retry_on_failure = true begin { yield } rescue Thrift::TransportException, IOError, Thrift::ApplicationException, Thrift::ProtocolException => err if @retry_on_failure @retry_on_failure = false @connection.close @connection.open @namespace = @connection.open_namespace(@config[:namespace]) retry else raise err end end end |
#rubify_column_name(column_name) ⇒ Object
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# File 'lib/active_record/connection_adapters/hypertable_adapter.rb', line 380 def rubify_column_name(column_name) column_name.to_s.gsub(/-+/, '_') end |
#sanitize_conditions(options) ⇒ Object
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# File 'lib/active_record/connection_adapters/hypertable_adapter.rb', line 127 def sanitize_conditions() case [:conditions] when Hash # requires Hypertable API to support query by arbitrary cell value raise "HyperRecord does not support specifying conditions by Hash" when NilClass # do nothing else raise "Only hash conditions are supported" end end |
#supports_migrations? ⇒ Boolean
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# File 'lib/active_record/connection_adapters/hypertable_adapter.rb', line 114 def supports_migrations? true end |
#tables(name = nil) ⇒ Object
Returns an array of tables available in the current Hypertable instance.
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# File 'lib/active_record/connection_adapters/hypertable_adapter.rb', line 527 def tables(name=nil) retry_on_connection_error { @connection.get_tables(@namespace) } end |
#thrift_cell_from_native_array(array) ⇒ Object
Return a Hypertable::ThriftGen::Cell object from a cell passed in as an array of format: [row_key, column_name, value] Hypertable::ThriftGen::Cell objects are required when setting a flag on write - used by special operations (e.g,. delete )
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# File 'lib/active_record/connection_adapters/hypertable_adapter.rb', line 579 def thrift_cell_from_native_array(array) cell = Hypertable::ThriftGen::Cell.new cell.key = Hypertable::ThriftGen::Key.new cell.key.row = array[0] cell.key.column_family = array[1] cell.key.column_qualifier = array[2] if !array[2].blank? cell.value = array[3] if array[3] cell.key. = array[4] if array[4] cell end |
#with_scanner(table_name, scan_spec, &block) ⇒ Object
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# File 'lib/active_record/connection_adapters/hypertable_adapter.rb', line 685 def with_scanner(table_name, scan_spec, &block) @connection.with_scanner(@namespace, table_name, scan_spec, &block) end |
#write_cells(table_name, cells, options = {}) ⇒ Object
Write an array of cells to the named table. By default, write_cells will open and close a mutator for this operation. Closing the mutator flushes the data, which guarantees is it is stored in Hypertable before the call returns. This also slows down the operation, so if you’re doing lots of writes and want to manage mutator flushes at the application layer then you can pass in a mutator as argument. Mutators can be created with the open_mutator method. In the near future (Summer 2009), Hypertable will provide a periodic mutator that automatically flushes at specific intervals.
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# File 'lib/active_record/connection_adapters/hypertable_adapter.rb', line 542 def write_cells(table_name, cells, ={}) return if cells.blank? mutator = [:mutator] flags = [:flags] flush_interval = [:flush_interval] retry_on_connection_error { local_mutator_created = !mutator begin t1 = Time.now mutator ||= open_mutator(table_name, flags, flush_interval) if [:asynchronous_write] mutate_spec = Hypertable::ThriftGen::MutateSpec.new mutate_spec.appname = 'hyper_record' mutate_spec.flush_interval = 1000 mutate_spec.flags = 2 @connection.offer_cells_as_arrays(@namespace, table_name, mutate_spec, cells) else @connection.set_cells_as_arrays(mutator, cells) end ensure if local_mutator_created && mutator close_mutator(mutator) mutator = nil end @@write_latency += Time.now - t1 end } end |