| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| |
| package org.apache.sysds.runtime.io; |
| |
| import java.io.BufferedWriter; |
| import java.io.IOException; |
| import java.io.OutputStreamWriter; |
| import java.util.Iterator; |
| |
| import org.apache.hadoop.fs.FileSystem; |
| import org.apache.hadoop.fs.Path; |
| import org.apache.hadoop.mapred.JobConf; |
| import org.apache.sysds.conf.ConfigurationManager; |
| import org.apache.sysds.runtime.DMLRuntimeException; |
| import org.apache.sysds.runtime.matrix.data.FrameBlock; |
| import org.apache.sysds.runtime.transform.TfUtils; |
| import org.apache.sysds.runtime.util.HDFSTool; |
| |
| /** |
| * Single-threaded frame text csv writer. |
| * |
| */ |
| public class FrameWriterTextCSV extends FrameWriter |
| { |
| //blocksize for string concatenation in order to prevent write OOM |
| //(can be set to very large value to disable blocking) |
| public static final int BLOCKSIZE_J = 32; //32 cells (typically ~512B, should be less than write buffer of 1KB) |
| |
| protected FileFormatPropertiesCSV _props = null; |
| |
| public FrameWriterTextCSV( FileFormatPropertiesCSV props ) { |
| _props = props; |
| } |
| |
| @Override |
| public final void writeFrameToHDFS(FrameBlock src, String fname, long rlen, long clen) |
| throws IOException, DMLRuntimeException |
| { |
| //prepare file access |
| JobConf job = new JobConf(ConfigurationManager.getCachedJobConf()); |
| Path path = new Path( fname ); |
| |
| //if the file already exists on HDFS, remove it. |
| HDFSTool.deleteFileIfExistOnHDFS( fname ); |
| |
| //validity check frame dimensions |
| if( src.getNumRows() != rlen || src.getNumColumns() != clen ) { |
| throw new IOException("Frame dimensions mismatch with metadata: " + |
| src.getNumRows()+"x"+src.getNumColumns()+" vs "+rlen+"x"+clen+"."); |
| } |
| |
| //core write (sequential/parallel) |
| writeCSVFrameToHDFS(path, job, src, rlen, clen, _props); |
| } |
| |
| protected void writeCSVFrameToHDFS( Path path, JobConf job, FrameBlock src, long rlen, long clen, FileFormatPropertiesCSV csvprops ) |
| throws IOException |
| { |
| FileSystem fs = IOUtilFunctions.getFileSystem(path, job); |
| |
| //sequential write to single text file |
| writeCSVFrameToFile(path, job, fs, src, 0, (int)rlen, csvprops); |
| IOUtilFunctions.deleteCrcFilesFromLocalFileSystem(fs, path); |
| } |
| |
| protected static void writeCSVFrameToFile( Path path, JobConf job, FileSystem fs, FrameBlock src, int rl, int ru, FileFormatPropertiesCSV props ) |
| throws IOException |
| { |
| //create buffered writer |
| BufferedWriter br=new BufferedWriter(new OutputStreamWriter(fs.create(path,true))); |
| int cols = src.getNumColumns(); |
| |
| try |
| { |
| //for obj reuse and preventing repeated buffer re-allocations |
| StringBuilder sb = new StringBuilder(); |
| |
| props = (props==null)? new FileFormatPropertiesCSV() : props; |
| String delim = props.getDelim(); |
| |
| // Write header line, if needed |
| if( rl==0 ) { |
| //append column names if header requested |
| if( props.hasHeader() ) { |
| for( int j=0; j<cols; j++ ) { |
| sb.append(src.getColumnNames()[j]); |
| if ( j < cols-1 ) |
| sb.append(delim); |
| } |
| sb.append('\n'); |
| } |
| //append meta data |
| if( !src.isColumnMetadataDefault() ) { |
| sb.append(TfUtils.TXMTD_MVPREFIX + delim); |
| for( int j=0; j<cols; j++ ) |
| sb.append(src.getColumnMetadata(j).getMvValue() + ((j<cols-1)?delim:"")); |
| sb.append("\n"); |
| sb.append(TfUtils.TXMTD_NDPREFIX + delim); |
| for( int j=0; j<cols; j++ ) |
| sb.append(src.getColumnMetadata(j).getNumDistinct() + ((j<cols-1)?delim:"")); |
| sb.append("\n"); |
| } |
| br.write( sb.toString() ); |
| sb.setLength(0); |
| } |
| |
| // Write data lines |
| Iterator<String[]> iter = src.getStringRowIterator(rl, ru); |
| while( iter.hasNext() ) { |
| //write row chunk-wise to prevent OOM on large number of columns |
| String[] row = iter.next(); |
| for( int bj=0; bj<cols; bj+=BLOCKSIZE_J ) { |
| for( int j=bj; j<Math.min(cols,bj+BLOCKSIZE_J); j++ ) { |
| if(row[j] != null) |
| sb.append(row[j]); |
| if( j != cols-1 ) |
| sb.append(delim); |
| } |
| br.write( sb.toString() ); |
| sb.setLength(0); |
| } |
| |
| sb.append('\n'); |
| br.write( sb.toString() ); |
| sb.setLength(0); |
| } |
| } |
| finally { |
| IOUtilFunctions.closeSilently(br); |
| } |
| } |
| } |