TSV文件数据源 (TsvSourceStreamOp)

Java 类名：com.alibaba.alink.operator.stream.source.TsvSourceStreamOp

Python 类名：TsvSourceStreamOp

功能介绍

按行读取以tab为分隔符的Tsv文件。

参数说明

名称	中文名称	描述	类型	是否必须？	取值范围	默认值
filePath	文件路径	文件路径	String	✓
schemaStr	Schema	Schema。格式为“colname coltype[, colname2, coltype2[, …]]”，例如“f0 string, f1 bigint, f2 double”	String	✓
ignoreFirstLine	是否忽略第一行数据	是否忽略第一行数据	Boolean			false
partitions	分区名	1)单级、单个分区示例：ds=20190729；2)多级分区之间用“ / ”分隔，例如：ds=20190729/dt=12； 3)多个分区之间用“,”分隔，例如：ds=20190729,ds=20190730	String			null
skipBlankLine	是否忽略空行	是否忽略空行	Boolean			true

代码示例

Python 代码

from pyalink.alink import *

import pandas as pd

useLocalEnv(1)

df = pd.DataFrame([
                ["0L", "1L", 0.6],
                ["2L", "2L", 0.8],
                ["2L", "4L", 0.6],
                ["3L", "1L", 0.6],
                ["3L", "2L", 0.3],
                ["3L", "4L", 0.4]
        ])

source = StreamOperator.fromDataframe(df, schemaStr='uid string, iid string, label double')

filepath = "/tmp/abc.tsv"
tsvSink = TsvSinkStreamOp()\
    .setFilePath(filepath)\
    .setOverwriteSink(True)

source.link(tsvSink)

StreamOperator.execute()

tsvSource = TsvSourceStreamOp().setFilePath(filepath).setSchemaStr("f string");
tsvSource.print()

StreamOperator.execute()

Java 代码

import org.apache.flink.types.Row;

import com.alibaba.alink.operator.stream.StreamOperator;
import com.alibaba.alink.operator.stream.sink.TsvSinkStreamOp;
import com.alibaba.alink.operator.stream.source.MemSourceStreamOp;
import com.alibaba.alink.operator.stream.source.TsvSourceStreamOp;
import org.junit.Test;

import java.util.Arrays;
import java.util.List;

public class TsvSourceStreamOpTest {
	@Test
	public void testTsvSourceStreamOp() throws Exception {
		List <Row> df = Arrays.asList(
			Row.of("0L", "1L", 0.6),
			Row.of("2L", "2L", 0.8),
			Row.of("2L", "4L", 0.6),
			Row.of("3L", "1L", 0.6),
			Row.of("3L", "2L", 0.3),
			Row.of("3L", "4L", 0.4)
		);
		StreamOperator <?> source = new MemSourceStreamOp(df, "uid string, iid string, label double");
		String filepath = "/tmp/abc.tsv";
		StreamOperator <?> tsvSink = new TsvSinkStreamOp()
			.setFilePath(filepath)
			.setOverwriteSink(true);
		source.link(tsvSink);
		StreamOperator.execute();
		StreamOperator <?> tsvSource = new TsvSourceStreamOp().setFilePath(filepath).setSchemaStr("f string");
		tsvSource.print();
		StreamOperator.execute();
	}
}

运行结果

f
3L
0L
3L
3L
2L
2L