Embuk internals
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The document discusses how Embulk executes data loading tasks, including an overview of execution in single-threaded, parallel, and distributed modes. It describes how Embulk uses plugins and transactions to control task configuration and execution, performing type conversions between input and output data formats. The key components involved in task execution are the input plugin, parser plugin, filter plugins, formatter plugin, output plugin, and executor plugin.
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Embuk internals
- 1. Treasure Data, Inc. Founder & Software Architect Sadayuki Furuhashi Embulk Internals
- 2. Execution overview Task Transaction Task Task taskCount { taskIndex: 0, task: {…} } { taskIndex: 2, task: {…} } runs on a single thread runs on multiple threads (or machines)
- 3. Parallel execution Task Task Task Task Threads Task queue run tasks in parallel (embulk-executor-local-thread)
- 4. Distributed execution Task Task Task Task Map tasks Task queue run tasks on Hadoop (embulk-executor-mapreduce)
- 5. Distributed execution (w/ partitioning) Task Task Task Task Map - Shuffle - Reduce Task queue run tasks on Hadoop (embulk-executor-mapreduce)
- 6. Transaction control fileInput.transaction { parser.transaction { filters.transaction { formatter.transaction { fileOutput.transaction { executor.transaction { … } } } } } } file input plugin parser plugin filter plugins formatter plugin file output plugin executor plugin Task Task
- 7. Task configuration fileInput.transaction { fileInputTask, taskCount → parser.transaction { parserTask, schema → filters.transaction { filterTasks, schema → formatter.transaction { formatterTask → fileOutput.transaction { fileOutputTask → executor.transaction { → task = { fileInputTask, parserTask, filterTasks, formatterTask, fileOutputTask, } taskCount.times.inParallel { taskIndex → run(taskIndex, task) taskCount is decided by input schema is decided by input, and may be modified by filters
- 8. Task execution parser.run(fileInput, pageOutput) fileInput.open() formatter.open(fileOutput) fileOutput.open() parser plugin file input plugin filter plugins file output plugin formatter plugin …Task Task …
- 9. Type conversion Embulk type systemInput type system Output type system boolean long double string timestamp boolean integer bigint double precision text varchar date timestamp timestamp with zone … (e.g. PostgreSQL) boolean integer long float double string array geo point geo shape … (e.g. Elasticsearch) Input plugin (parser plugin if input is file-based) Output plugin (formatter plugin if output is file-based)