Add parquet compressor using columnify

README.md

@@ -409,6 +409,8 @@ archive format on S3. You can use several format:
 *   gzip_command (Need gzip command)
     *   This compressor uses an external gzip command, hence would result in
         utilizing CPU cores well compared with `gzip`
+*   parquet (Need columnify command)
+    *   This compressor uses an external [columnify](https://github.com/reproio/columnify) command.
 
 See `Use your compression algorithm` section for adding another format.
 

lib/fluent/plugin/s3_compressor_parquet.rb

@@ -0,0 +1,83 @@
+require "open3"
+
+module Fluent::Plugin
+  class S3Output
+    class ParquetCompressor < Compressor
+      S3Output.register_compressor("parquet", self)
+
+      config_section :compress, multi: false do
+        desc "parquet compression codec"
+        config_param :parquet_compression_codec, :enum, list: [:uncompressed, :snappy, :gzip, :lzo, :brotli, :lz4, :zstd], default: :snappy
+        desc "parquet file page size"
+        config_param :parquet_page_size, :size, default: 8192
+        desc "parquet file row group size"
+        config_param :parquet_row_group_size, :size, default: 128 * 1024 * 1024
+        desc "record data format type"
+        config_param :record_type, :enum, list: [:avro, :csv, :jsonl, :msgpack, :tsv, :json], default: :msgpack
+        desc "schema type"
+        config_param :schema_type, :enum, list: [:avro, :bigquery], default: :avro
+        desc "path to schema file"
+        config_param :schema_file, :string
+      end
+
+      def configure(conf)
+        super
+        check_command("columnify", "-h")
+
+        if [:lzo, :brotli, :lz4].include?@compress.parquet_compression_codec
+          raise Fluent::ConfigError, "unsupported compression codec: #{@compress.parquet_compression_codec}"
+        end
+
+        @parquet_compression_codec = @compress.parquet_compression_codec.to_s.upcase
+        if @compress.record_type == :json
+          @record_type = :jsonl
+        else
+          @record_type = @compress.record_type
+        end
+      end
+
+      def ext
+        "parquet".freeze
+      end
+
+      def content_type
+        "application/octet-stream".freeze
+      end
+
+      def compress(chunk, tmp)
+        chunk_is_file = @buffer_type == "file"
+        path = if chunk_is_file
+                 chunk.path
+               else
+                 w = Tempfile.new("chunk-parquet-tmp")
+                 w.binmode
+                 chunk.write_to(w)
+                 w.close
+                 w.path
+               end
+        stdout, stderr, status = columnify(path, tmp.path)
+        unless status.success?
+          raise "failed to execute columnify command. stdout=#{stdout} stderr=#{stderr} status=#{status.inspect}"
+        end
+      ensure
+        unless chunk_is_file
+          w.close(true) rescue nil
+        end
+      end
+
+      private
+
+      def columnify(src_path, dst_path)
+        Open3.capture3("columnify",
+                       "-parquetCompressionCodec", @parquet_compression_codec,
+                       "-parquetPageSize", @compress.parquet_page_size.to_s,
+                       "-parquetRowGroupSize", @compress.parquet_row_group_size.to_s,
+                       "-recordType", @record_type.to_s,
+                       "-schemaType", @compress.schema_type.to_s,
+                       "-schemaFile", @compress.schema_file,
+                       "-output", dst_path,
+                       src_path)
+      end
+    end
+  end
+end