c#如何与flink集群交互

要在C#中与Flink集群进行交互，您需要使用Flink的REST API。以下是一个简单的示例，展示了如何使用C#与Flink集群进行交互：

首先，确保您已经安装了Flink集群并运行正常。您可以按照Flink官方文档中的说明进行安装和配置：https://ci.apache.org/projects/flink/flink-docs-release-1.13/docs/try-flink/local_installation/
在C#项目中，安装System.Net.Http库，用于发送HTTP请求。
创建一个C#类，用于与Flink集群进行交互。以下是一个简单的示例：

using System;
using System.Net.Http;
using System.Threading.Tasks;

namespace FlinkInteraction
{
    public class FlinkClient
    {
        private readonly HttpClient _httpClient;
        private readonly string _flinkJobManagerUrl;

        public FlinkClient(string flinkJobManagerUrl)
        {
            _httpClient = new HttpClient();
            _flinkJobManagerUrl = flinkJobManagerUrl;
        }

        public async Task<string> SubmitJobAsync(string jarId, string entryClass, string parallelism)
        {
            var submitJobUrl = $"{_flinkJobManagerUrl}/jars/{jarId}/run";
            var content = new FormUrlEncodedContent(new[]
            {
                new KeyValuePair<string, string>("entry-class", entryClass),
                new KeyValuePair<string, string>("parallelism", parallelism)
            });

            var response = await _httpClient.PostAsync(submitJobUrl, content);
            if (response.IsSuccessStatusCode)
            {
                var result = await response.Content.ReadAsStringAsync();
                return result;
            }
            else
            {
                throw new Exception($"Failed to submit job: {response.StatusCode}");
            }
        }

        public async Task<string> GetJobStatusAsync(string jobId)
        {
            var jobStatusUrl = $"{_flinkJobManagerUrl}/jobs/{jobId}";
            var response = await _httpClient.GetAsync(jobStatusUrl);
            if (response.IsSuccessStatusCode)
            {
                var result = await response.Content.ReadAsStringAsync();
                return result;
            }
            else
            {
                throw new Exception($"Failed to get job status: {response.StatusCode}");
            }
        }
    }
}

使用FlinkClient类与Flink集群进行交互。以下是一个简单的示例：

using System;
using System.Threading.Tasks;

namespace FlinkInteraction
{
    class Program
    {
        static async Task Main(string[] args)
        {
            // Replace with your Flink JobManager URL
            var flinkJobManagerUrl = "http://localhost:8081";
            var flinkClient = new FlinkClient(flinkJobManagerUrl);

            // Replace with your JAR file ID, entry class, and parallelism
            var jarId = "your-jar-id";
            var entryClass = "your.entry.class";
            var parallelism = "1";

            try
            {
                // Submit the job
                var jobResponse = await flinkClient.SubmitJobAsync(jarId, entryClass, parallelism);
                Console.WriteLine($"Job submitted successfully: {jobResponse}");

                // Get the job ID from the response
                var jobId = jobResponse.Split('"')[3];

                // Get the job status
                var jobStatusResponse = await flinkClient.GetJobStatusAsync(jobId);
                Console.WriteLine($"Job status: {jobStatusResponse}");
            }
            catch (Exception ex)
            {
                Console.WriteLine($"Error: {ex.Message}");
            }
        }
    }
}

这个示例展示了如何使用C#与Flink集群进行交互。您可以根据自己的需求修改代码，以满足不同的场景。

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