无法使用flink表api打印csv文件

n3h0vuf2 于 2021-06-21 发布在 Flink

关注(0)|答案(2)|浏览(436)

我正在尝试读取一个包含34个字段的文件，以便使用netbeans在控制台上打印。但是，我只能打印模式。因为csvreader使用的flink的这个特定版本缺少打印选项。
请看代码，并帮助我了解我应该纠正。我会用 CSVReader ，但事实证明它不支持超过22个字段，因此只能使用表api。也尝试过使用 CsvTableSource 1.5.1版本的flink，但语法不好。作为 .field("%CPU", Types.FLOAT()) 不断给出错误的类型浮点未识别符号。我的主要目标是只能够读取csv文件，然后发送到一个Kafka主题，但在此之前，我想检查文件是否读取，还没有运气。

import org.apache.flink.table.api.Table;
import  org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
import org.apache.flink.table.api.TableEnvironment;
import org.apache.flink.table.sources.CsvTableSource;
import org.apache.flink.types.Row;
import org.apache.flink.streaming.api.datastream.DataStream;
import org.apache.flink.streaming.api.datastream.DataStreamSink;
import org.apache.flink.table.api.Types;
import org.apache.flink.api.common.typeinfo.TypeInformation;
import org.apache.flink.table.sinks.CsvTableSink;
import org.apache.flink.table.sinks.TableSink;
import org.apache.flink.table.api.java.Slide;

public class CsvReader {
  public static void main(String[] args) throws Exception {

StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();
TableEnvironment tEnv = TableEnvironment.getTableEnvironment (env);
CsvTableSource csvTableSource = new CsvTableSource("/home/merlin/Experiments/input_container/container_data1.csv",
            new String[] { "%CPU", "MEM", "VSZ", "RSS", "timestamp",
    "OOM_Score", "io_read_count", "io_write_count", "io_read_bytes", "io_write_bytes",
    "io_read_chars", "io_write_chars", "num_fds", "num_ctx_switches_voluntary", "num_ctx_switches_involuntary",
    "mem_rss", "mem_vms", "mem_shared", "mem_text", "mem_lib", "mem_data", "mem_dirty", "mem_uss", "mem_pss",
    "mem_swap", "num_threads", "cpu_time_user", "cpu_time_system", "cpu_time_children_user",
    "cpu_time_children_system", "container_nr_sleeping", "container_nr_running",
    "container_nr_stopped", "container_nr_uninterruptible","container_nr_iowait" },
            new TypeInformation<?>[] {
                    Types.FLOAT(),
                    Types.FLOAT(),
                    Types.FLOAT(),
                    Types.FLOAT(),
                                            Types.FLOAT(),
                                            Types.FLOAT(),
                                            Types.FLOAT(),
                                            Types.FLOAT(),
                                            Types.FLOAT(),
                                            Types.FLOAT(),
                                            Types.FLOAT(),
                                            Types.FLOAT(),
                                            Types.FLOAT(),
                                            Types.FLOAT(),
                                            Types.FLOAT(),
                                            Types.FLOAT(),
                                            Types.FLOAT(),
                                            Types.FLOAT(),
                                            Types.FLOAT(),
                                            Types.FLOAT(),
                                            Types.FLOAT(),
                                            Types.FLOAT(),
                                            Types.FLOAT(),
                                            Types.FLOAT(),
                                            Types.FLOAT(),
                                            Types.FLOAT(),
                                            Types.FLOAT(),
                                            Types.FLOAT(),
                                            Types.FLOAT(),
                                            Types.FLOAT(),
                                            Types.FLOAT(),
                                            Types.FLOAT(),
                                            Types.FLOAT(),
                                            Types.FLOAT(),
                                            Types.FLOAT()
                            });// lenient

    tEnv.registerTableSource("container", csvTableSource);
    Table result = tEnv
        .scan("container");
        System.out.println(result);
                result.printSchema();

      }
    }
/*tEnv.toAppendStream(result, Row.class).print();         
result.writeToSink(null);print();
            env.execute();*/

这是输出

root
 |-- %CPU: Float
 |-- MEM: Float
 |-- VSZ: Float
 |-- RSS: Float
 |-- timestamp: Float
 |-- OOM_Score: Float
 |-- io_read_count: Float
 |-- io_write_count: Float
 |-- io_read_bytes: Float
 |-- io_write_bytes: Float
 |-- io_read_chars: Float
 |-- io_write_chars: Float
 |-- num_fds: Float
 |-- num_ctx_switches_voluntary: Float
 |-- num_ctx_switches_involuntary: Float
 |-- mem_rss: Float
 |-- mem_vms: Float
 |-- mem_shared: Float
 |-- mem_text: Float
 |-- mem_lib: Float
 |-- mem_data: Float
 |-- mem_dirty: Float
 |-- mem_uss: Float
 |-- mem_pss: Float
 |-- mem_swap: Float
 |-- num_threads: Float
 |-- cpu_time_user: Float
 |-- cpu_time_system: Float
 |-- cpu_time_children_user: Float
 |-- cpu_time_children_system: Float
 |-- container_nr_sleeping: Float
 |-- container_nr_running: Float
 |-- container_nr_stopped: Float
 |-- container_nr_uninterruptible: Float
 |-- container_nr_iowait: Float

这是另一个版本的代码，也不起作用

package wikiedits;

import static com.sun.xml.internal.fastinfoset.alphabet.BuiltInRestrictedAlphabets.table;
import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
import org.apache.flink.api.common.typeinfo.Types;
import org.apache.flink.types.Row;
import org.apache.flink.streaming.api.datastream.DataStream;
import org.apache.flink.streaming.api.datastream.DataStreamSink;
import org.apache.flink.table.api.TableEnvironment;
public class Csv {
  public static void main(String[] args) throws Exception {

    final StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();
    StreamTableEnvironment tEnv = TableEnvironment.getTableEnvironment (env);
//TableEnvironment tEnv = TableEnvironment.getTableEnvironment (env);

    CsvTableSource csvTableSource = CsvTableSource
    .builder()
    .path("home/merlin/Experiments/input_container/container_data1.csv")
    .field("%CPU", Types.FLOAT)
    .field("MEM", Types.FLOAT)
    .field("VSZ", Types.FLOAT)
    .field("RSS", Types.FLOAT)
    .field("timestamp", Types.FLOAT)
    .field("OOM_Score", Types.FLOAT)
    .field("io_read_count", Types.FLOAT)
    .field("io_write_count", Types.FLOAT)
    .field("io_read_bytes", Types.FLOAT)
    .field("io_write_bytes", Types.FLOAT)
    .field("io_read_chars", Types.FLOAT)
    .field("io_write_chars", Types.FLOAT)
    .field("num_fds", Types.FLOAT)
    .field("num_ctx_switches_voluntary", Types.FLOAT)
    .field("num_ctx_switches_involuntary", Types.FLOAT)
    .field("mem_rss", Types.FLOAT)
    .field("mem_vms", Types.FLOAT)
    .field("mem_shared", Types.FLOAT)
    .field("mem_text", Types.FLOAT)
    .field("mem_lib", Types.FLOAT)
    .field("mem_data", Types.FLOAT)
    .field("mem_dirty", Types.FLOAT)
    .field("mem_uss", Types.FLOAT)
    .field("mem_pss", Types.FLOAT)
    .field("mem_swap", Types.FLOAT)
    .field("num_threads", Types.FLOAT)
    .field("cpu_time_user", Types.FLOAT)
    .field("cpu_time_system", Types.FLOAT)
    .field("cpu_time_children_user", Types.FLOAT)
    .field("cpu_time_children_system", Types.FLOAT)
    .field("container_nr_sleeping", Types.FLOAT)
    .field("container_nr_running", Types.FLOAT)
    .field("container_nr_stopped", Types.FLOAT)
    .field("container_nr_uninterruptible", Types.FLOAT)
    .field("container_nr_iowait", Types.FLOAT)
    .fieldDelimiter(",")
    .lineDelimiter("\n")
    .ignoreFirstLine()
    .ignoreParseErrors()
    .commentPrefix("%")
    .build();
// name your table source
tEnv.registerTableSource("container", csvTableSource);
Table table = tEnv.scan("container");
DataStream<Row> stream = tEnv.toAppendStream(table, Row.class);
// define the sink as common print on console here
      stream.print();
             // env.execute();

  }
}

如果我必须将它传递到一个kafka主题，然后传递到一个函数调用中，是否需要新编辑？这就是我所尝试的：

DataStreamSink<Row> stream = addSink(new FlinkKafkaProducer09<>( "my-second-topic", new SimpleStringSchema(), properties));
//DataStreamSink<Row> stream = tEnv.toAppendStream(table, Row.class).print();
 stream.map(new MapFunction<String, String>() {
  private static final long serialVersionUID = -6867736771747690202L;
    public String map(String value) throws Exception {
    SendToRestAPI sendrest= new SendToRestAPI(value);
    String String1= sendrest.converttoJson();  

    return "Stream Value: " + String1;
  }
})
.addSink(new FlinkKafkaProducer09<>( "my-second-topic", new SimpleStringSchema(), properties)); /*.print();*/

env.execute();
  }
 }

stream.map行抛出错误：

Cannot find symbol:method Map

Java csv apache-flink flink-sql flink-streaming

来源：https://stackoverflow.com/questions/51589935/unable-to-print-a-csv-file-using-flink-table-api

2条答案

按热度按时间

9ceoxa921#

此代码：

package example.flink;

import org.apache.flink.api.common.typeinfo.Types;
import org.apache.flink.streaming.api.datastream.DataStream;
import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
import org.apache.flink.table.api.java.StreamTableEnvironment;
import org.apache.flink.table.api.Table;
import org.apache.flink.table.api.TableEnvironment;
import org.apache.flink.table.sources.CsvTableSource;
import org.apache.flink.types.Row;

public class TestFlink {
    public static void main(String[] args) {

        final StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();
        StreamTableEnvironment tEnv = TableEnvironment.getTableEnvironment (env);

        CsvTableSource csvTableSource = CsvTableSource
                .builder()
                .path("container_data.csv")
                .field("%CPU", Types.FLOAT)
                .field("MEM", Types.FLOAT)
                .field("VSZ", Types.FLOAT)
                .field("RSS", Types.FLOAT)
                .field("timestamp", Types.FLOAT)
                .field("OOM_Score", Types.FLOAT)
                .field("io_read_count", Types.FLOAT)
                .field("io_write_count", Types.FLOAT)
                .field("io_read_bytes", Types.FLOAT)
                .field("io_write_bytes", Types.FLOAT)
                .field("io_read_chars", Types.FLOAT)
                .field("io_write_chars", Types.FLOAT)
                .field("num_fds", Types.FLOAT)
                .field("num_ctx_switches_voluntary", Types.FLOAT)
                .field("num_ctx_switches_involuntary", Types.FLOAT)
                .field("mem_rss", Types.FLOAT)
                .field("mem_vms", Types.FLOAT)
                .field("mem_shared", Types.FLOAT)
                .field("mem_text", Types.FLOAT)
                .field("mem_lib", Types.FLOAT)
                .field("mem_data", Types.FLOAT)
                .field("mem_dirty", Types.FLOAT)
                .field("mem_uss", Types.FLOAT)
                .field("mem_pss", Types.FLOAT)
                .field("mem_swap", Types.FLOAT)
                .field("num_threads", Types.FLOAT)
                .field("cpu_time_user", Types.FLOAT)
                .field("cpu_time_system", Types.FLOAT)
                .field("cpu_time_children_user", Types.FLOAT)
                .field("cpu_time_children_system", Types.FLOAT)
                .field("container_nr_sleeping", Types.FLOAT)
                .field("container_nr_running", Types.FLOAT)
                .field("container_nr_stopped", Types.FLOAT)
                .field("container_nr_uninterruptible", Types.FLOAT)
                .field("container_nr_iowait", Types.FLOAT)
                .fieldDelimiter(",")
                .lineDelimiter("\n")
                .ignoreFirstLine()
                .ignoreParseErrors()
                .commentPrefix("%")
                .build();
        // name your table source
        tEnv.registerTableSource("container", csvTableSource);
        Table table = tEnv.scan("container");
        DataStream<Row> stream = tEnv.toAppendStream(table, Row.class);
        // define the sink as common print on console here
        stream.print();
        try {
            env.execute();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

对于这些库（有些可能是多余的）：

compile group: 'org.slf4j', name: 'slf4j-simple', version: '1.7.25'
compile group: 'org.apache.flink', name: 'flink-clients_2.11', version: '1.5.1'
compile group: 'org.apache.flink', name: 'flink-table_2.11', version: '1.5.1'
compile group: 'org.apache.flink', name: 'flink-core', version: '1.5.1'
compile group: 'org.apache.flink', name: 'flink-java', version: '1.5.1'
compile group: 'org.apache.flink', name: 'flink-streaming-scala_2.11', version: '1.5.1'
compile group: 'org.apache.flink', name: 'flink-streaming-java_2.11', version: '1.5.1'
compile group: 'org.apache.flink', name: 'flink-runtime_2.11', version: '1.5.1'

至少正在运行。我不确定它是否提供了您需要的输出，但它几乎完全是您在最新编辑中输入的内容，但它是在ide中工作的。有帮助吗？
如果分隔符仍然是空格，请记住更改 .fieldDelimiter(",")

赞(0）回复(0）举报 2021-06-21

mftmpeh82#

你必须转换 Table 变成一个 DataStream 打印出来。最简单的方法是将其转换为 DataStream<Row> 具体如下：

DataStream<Row> stream = tEnv.toAppendStream(result, Row.class);
// print the stream & execute the program
stream.print();
env.execute();

有关更多详细信息，请参阅文档。

赞(0）回复(0）举报 2021-06-21

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无法使用flink表api打印csv文件

2条答案

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