Class: Tapsoob::DataStream::FilePartition

Inherits:
Base
  • Object
show all
Defined in:
lib/tapsoob/data_stream/file_partition.rb

Overview

DataStream variant for file-based parallelized loading Each worker reads a different portion of the NDJSON file

Constant Summary

Constants inherited from Base

Base::DEFAULT_CHUNKSIZE

Instance Attribute Summary

Attributes inherited from Base

#db, #options, #state

Instance Method Summary collapse

Methods inherited from Base

#encode_rows, #error, #error=, factory, #fetch, #fetch_data_from_database, #fetch_data_to_database, #fetch_rows, #import_rows, #increment, #log, #max_chunksize_training, #order_by, #parse_encoded_data, parse_json, #string_columns, #table, #table_name, #table_name_sql, #to_hash, #to_json, #update_chunksize_stats, #verify_stream

Constructor Details

#initialize(db, state, opts = {}) ⇒ FilePartition

Returns a new instance of FilePartition.



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# File 'lib/tapsoob/data_stream/file_partition.rb', line 9

def initialize(db, state, opts = {})
  super(db, state, opts)
  @state = {
    :line_range => nil,  # [start_line, end_line]
    :lines_read => 0
  }.merge(@state)

  # Initialize current_line from line_range if provided
  if @state[:line_range]
    start_line, end_line = @state[:line_range]
    @state[:current_line] = start_line
  end
end

Instance Method Details

#complete? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/tapsoob/data_stream/file_partition.rb', line 78

def complete?
  return true if state[:line_range].nil?
  start_line, end_line = state[:line_range]
  result = state[:current_line] && state[:current_line] > end_line
  log.debug "DataStream::FilePartition#complete? current_line=#{state[:current_line]} end_line=#{end_line} result=#{result} table=#{table_name}"
  result
end

#fetch_file(dump_path) ⇒ Object 



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# File 'lib/tapsoob/data_stream/file_partition.rb', line 23

def fetch_file(dump_path)
  return {} if state[:line_range].nil?

  file_path = File.join(dump_path, "data", "#{table_name}.json")
  start_line, end_line = state[:line_range]

  table_name_val = nil
  header_val = nil
  types_val = nil
  data_batch = []

  # Read lines in this worker's range
  File.open(file_path, 'r') do |file|
    # Skip to current position
    state[:current_line].times { file.gets }

    # Read up to chunksize lines, but don't exceed end_line
    lines_to_read = [state[:chunksize], end_line - state[:current_line] + 1].min
    log.debug "DataStream::FilePartition#fetch_file: current_line=#{state[:current_line]} end_line=#{end_line} lines_to_read=#{lines_to_read} chunksize=#{state[:chunksize]} table=#{table_name}"

    lines_to_read.times do
      break if file.eof? || state[:current_line] > end_line

      line = file.gets
      next unless line

      chunk = JSON.parse(line.strip)
      table_name_val ||= chunk["table_name"]
      header_val ||= chunk["header"]
      types_val ||= chunk["types"]
      data_batch.concat(chunk["data"]) if chunk["data"]

      state[:current_line] += 1
    end
  end

  log.debug "DataStream::FilePartition#fetch_file: read #{data_batch.size} rows in #{state[:current_line] - start_line} lines table=#{table_name}"

  # Apply skip-duplicates if needed
  data_batch = data_batch.uniq if @options[:"skip-duplicates"]

  state[:size] = end_line - start_line + 1
  state[:offset] = state[:current_line] - start_line

  rows = {
    :table_name => table_name_val,
    :header     => header_val,
    :data       => data_batch,
    :types      => types_val
  }

  update_chunksize_stats
  rows
end