要获得与亚马逊 Timestream 类似的功能 LiveAnalytics，可以考虑适用于 InfluxDB 的亚马逊 Timestream。适用于 InfluxDB 的 Amazon Timestream 提供简化的数据摄取和个位数毫秒级的查询响应时间，以实现实时分析。点击[此处](https://docs.amazonaws.cn//timestream/latest/developerguide/timestream-for-influxdb.html)了解更多信息。

本文属于机器翻译版本。若本译文内容与英语原文存在差异，则一律以英文原文为准。

# 写入 SDK 客户端
<a name="code-samples.write-client"></a>

可使用以下代码段创建用于写入 SDK 的 Timestream 客户端。写入 SDK 用于执行 CRUD 操作，并将时间序列数据插入到 Timestream 中。

**注意**  
这些代码段基于 [GitHub](https://github.com/awslabs/amazon-timestream-tools/blob/master/sample_apps) 上的完整示例应用程序。有关如何开始使用示例应用程序的更多信息，请参阅 [示例应用程序](sample-apps.md)。

------
#### [  Java  ]

```
    private static AmazonTimestreamWrite buildWriteClient() {
        final ClientConfiguration clientConfiguration = new ClientConfiguration()
                .withMaxConnections(5000)
                .withRequestTimeout(20 * 1000)
                .withMaxErrorRetry(10);

        return AmazonTimestreamWriteClientBuilder
                .standard()
                .withRegion("us-east-1")
                .withClientConfiguration(clientConfiguration)
                .build();
    }
```

------
#### [  Java v2  ]

```
    private static TimestreamWriteClient buildWriteClient() {
        ApacheHttpClient.Builder httpClientBuilder =
                ApacheHttpClient.builder();
        httpClientBuilder.maxConnections(5000);

        RetryPolicy.Builder retryPolicy =
                RetryPolicy.builder();
        retryPolicy.numRetries(10);

        ClientOverrideConfiguration.Builder overrideConfig =
                ClientOverrideConfiguration.builder();
        overrideConfig.apiCallAttemptTimeout(Duration.ofSeconds(20));
        overrideConfig.retryPolicy(retryPolicy.build());

        return TimestreamWriteClient.builder()
                .httpClientBuilder(httpClientBuilder)
                .overrideConfiguration(overrideConfig.build())
                .region(Region.US_EAST_1)
                .build();
    }
```

------
#### [  Go  ]

```
tr := &http.Transport{
        ResponseHeaderTimeout: 20 * time.Second,
        // Using DefaultTransport values for other parameters: https://golang.org/pkg/net/http/#RoundTripper
        Proxy: http.ProxyFromEnvironment,
        DialContext: (&net.Dialer{
            KeepAlive: 30 * time.Second,
            DualStack: true,
            Timeout:   30 * time.Second,
        }).DialContext,
        MaxIdleConns:          100,
        IdleConnTimeout:       90 * time.Second,
        TLSHandshakeTimeout:   10 * time.Second,
        ExpectContinueTimeout: 1 * time.Second,
    }

    // So client makes HTTP/2 requests
    http2.ConfigureTransport(tr)

    sess, err := session.NewSession(&aws.Config{ Region: aws.String("us-east-1"), MaxRetries: aws.Int(10), HTTPClient: &http.Client{ Transport: tr }})
    writeSvc := timestreamwrite.New(sess)
```

------
#### [  Python  ]

```
write_client = session.client('timestream-write', config=Config(read_timeout=20, max_pool_connections = 5000, retries={'max_attempts': 10})) 
```

------
#### [  Node.js  ]

以下代码段使用 Amazon SDK for JavaScript v3。有关如何安装客户端和使用情况的更多信息，请参阅 [Timestream 写入客户端：Amazon SDK for JavaScript v3](https://docs.amazonaws.cn/AWSJavaScriptSDK/v3/latest/clients/client-timestream-write/index.html)。

此处显示额外的命令导入。创建客户端不需要 `CreateDatabaseCommand` 导入。

```
import { TimestreamWriteClient, CreateDatabaseCommand } from "@aws-sdk/client-timestream-write";
const writeClient = new TimestreamWriteClient({ region: "us-east-1" });
```

以下代码段使用 Amazon SDK for JavaScript V2 风格。该代码段基于示例应用程序，该应用程序位于 [GitHub 上的 Node.js 示例适用于 LiveAnalytics 的 Amazon Timestream 应用程序](https://github.com/awslabs/amazon-timestream-tools/tree/mainline/sample_apps/js)。

```
var https = require('https');
var agent = new https.Agent({
    maxSockets: 5000
});
writeClient = new AWS.TimestreamWrite({
        maxRetries: 10,
        httpOptions: {
            timeout: 20000,
            agent: agent
        }
    });
```

------
#### [  .NET  ]

```
var writeClientConfig = new AmazonTimestreamWriteConfig
{
    RegionEndpoint = RegionEndpoint.USEast1,
    Timeout = TimeSpan.FromSeconds(20),
    MaxErrorRetry = 10
};

var writeClient = new AmazonTimestreamWriteClient(writeClientConfig);
```

------

建议使用以下配置。
+ 将 SDK 重试计数设置为 `10`。
+ 使用 `SDK DEFAULT_BACKOFF_STRATEGY`。
+ 将 `RequestTimeout` 设置为 `20` 秒。
+ 将最大连接数设置为 `5000` 或更高。