hive中对多字节的处理

#建表语句 create table t_bi_reg(id string,name string,age string ) row format serde 'org.apache.hadoop.hive.serde2.RegexSerDe' with serdeproperties('input.regex'='((.\*)\\\\|\\\\|(.\*)\\\\|\\\\|(.\*))','output.format.string'='%1$s %2$s %3s') #input.regex:指定切分的正则 #output.format.string：切分之后输出的字段 #加载数据 load data local inpath ‘/Hadoop/data/1.txt’ into table t_bi_reg #查询 select * from t_bi_reg;

package com.zy.hive.delimit2; import java.io.IOException; import org.apache.hadoop.io.LongWritable; import org.apache.hadoop.io.Text; import org.apache.hadoop.mapred.FileSplit; import org.apache.hadoop.mapred.InputSplit; import org.apache.hadoop.mapred.JobConf; import org.apache.hadoop.mapred.RecordReader; import org.apache.hadoop.mapred.Reporter; import org.apache.hadoop.mapred.TextInputFormat; public class BiDelimiterInputFormat extends TextInputFormat { @Override public RecordReader<LongWritable, Text> getRecordReader(InputSplit genericSplit, JobConf job, Reporter reporter)throws IOException { reporter.setStatus(genericSplit.toString()); BiRecordReader reader = new BiRecordReader(job,(FileSplit)genericSplit); // MyRecordReader reader = new MyRecordReader(job,(FileSplit)genericSplit); return reader; } }

package com.zy.hive.delimit2; import java.io.IOException; import java.io.InputStream; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import org.apache.hadoop.conf.Configuration; import org.apache.hadoop.fs.FSDataInputStream; import org.apache.hadoop.fs.FileSystem; import org.apache.hadoop.fs.Path; import org.apache.hadoop.fs.Seekable; import org.apache.hadoop.io.LongWritable; import org.apache.hadoop.io.Text; import org.apache.hadoop.io.compress.CodecPool; import org.apache.hadoop.io.compress.CompressionCodec; import org.apache.hadoop.io.compress.CompressionCodecFactory; import org.apache.hadoop.io.compress.Decompressor; import org.apache.hadoop.io.compress.SplitCompressionInputStream; import org.apache.hadoop.io.compress.SplittableCompressionCodec; import org.apache.hadoop.mapred.FileSplit; import org.apache.hadoop.mapred.LineRecordReader; import org.apache.hadoop.mapred.RecordReader; public class BiRecordReader implements RecordReader<LongWritable, Text> { private static final Log LOG = LogFactory.getLog(LineRecordReader.class .getName()); private CompressionCodecFactory compressionCodecs = null; private long start; private long pos; private long end; private LineReader in; int maxLineLength; private Seekable filePosition; private CompressionCodec codec; private Decompressor decompressor; /** * A class that provides a line reader from an input stream. * @deprecated Use {@link org.apache.hadoop.util.LineReader} instead. */ @Deprecated public static class LineReader extends org.apache.hadoop.util.LineReader { LineReader(InputStream in) { super(in); } LineReader(InputStream in, int bufferSize) { super(in, bufferSize); } public LineReader(InputStream in, Configuration conf) throws IOException { Stay hungry Stay foolish -- http://blog.csdn.net/zhongqi2513 super(in, conf); } } public BiRecordReader(Configuration job, FileSplit split) throws IOException { this.maxLineLength = job.getInt("mapred.linerecordreader.maxlength", Integer.MAX_VALUE); start = split.getStart(); end = start + split.getLength(); final Path file = split.getPath(); compressionCodecs = new CompressionCodecFactory(job); codec = compressionCodecs.getCodec(file); // open the file and seek to the start of the split FileSystem fs = file.getFileSystem(job); FSDataInputStream fileIn = fs.open(split.getPath()); if (isCompressedInput()) { decompressor = CodecPool.getDecompressor(codec); if (codec instanceof SplittableCompressionCodec) { final SplitCompressionInputStream cIn = ((SplittableCompressionCodec) codec) .createInputStream(fileIn, decompressor, start, end, SplittableCompressionCodec.READ_MODE.BYBLOCK); in = new LineReader(cIn, job); start = cIn.getAdjustedStart(); end = cIn.getAdjustedEnd(); filePosition = cIn; // take pos from compressed stream } else { in = new LineReader(codec.createInputStream(fileIn, decompressor), job); filePosition = fileIn; } } else { fileIn.seek(start); in = new LineReader(fileIn, job); filePosition = fileIn; } // If this is not the first split, we always throw away first record // because we always (except the last split) read one extra line in // next() method. if (start != 0) { start += in.readLine(new Text(), 0, maxBytesToConsume(start)); } this.pos = start; Stay hungry Stay foolish -- http://blog.csdn.net/zhongqi2513 } private boolean isCompressedInput() { return (codec != null); } private int maxBytesToConsume(long pos) { return isCompressedInput() ? Integer.MAX_VALUE : (int) Math.min( Integer.MAX_VALUE, end - pos); } private long getFilePosition() throws IOException { long retVal; if (isCompressedInput() && null != filePosition) { retVal = filePosition.getPos(); } else { retVal = pos; } return retVal; } public BiRecordReader(InputStream in, long offset, long endOffset, int maxLineLength) { this.maxLineLength = maxLineLength; this.in = new LineReader(in); this.start = offset; this.pos = offset; this.end = endOffset; this.filePosition = null; } public BiRecordReader(InputStream in, long offset, long endOffset, Configuration job) throws IOException { this.maxLineLength = job.getInt("mapred.linerecordreader.maxlength", Integer.MAX_VALUE); this.in = new LineReader(in, job); this.start = offset; this.pos = offset; this.end = endOffset; this.filePosition = null; } public LongWritable createKey() { return new LongWritable(); Stay hungry Stay foolish -- http://blog.csdn.net/zhongqi2513 } public Text createValue() { return new Text(); } /** Read a line. */ public synchronized boolean next(LongWritable key, Text value) throws IOException { // We always read one extra line, which lies outside the upper // split limit i.e. (end - 1) while (getFilePosition() <= end) { key.set(pos); int newSize = in.readLine(value, maxLineLength,Math.max(maxBytesToConsume(pos), maxLineLength)); String str = value.toString().replaceAll("\\|\\|", "\\|"); value.set(str); pos += newSize; if (newSize == 0) { return false; } if (newSize < maxLineLength) { return true; } // line too long. try again LOG.info("Skipped line of size " + newSize + " at pos " + (pos - newSize)); } return false; } /** * Get the progress within the split */ public float getProgress() throws IOException { if (start == end) { return 0.0f; } else { return Math.min(1.0f, (getFilePosition() - start) Stay hungry Stay foolish -- http://blog.csdn.net/zhongqi2513 / (float) (end - start)); } } public synchronized long getPos() throws IOException { return pos; } public synchronized void close() throws IOException { try { if (in != null) { in.close(); } } finally { if (decompressor != null) { CodecPool.returnDecompressor(decompressor); } } } }

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