Error when requesting thing shadow - TOO_MANY_REQUESTS

Question

I'm getting error with TOO_MANY_REQUESTS code when requesting thing shadow in a server connection.
I think this error is caused by a quota exceeds, but I don't know what is the specific quota. If it is the case, can anyone help me to understand what is the quota my server is exceeding?

Bellow is the part of stack trace error

```
Caused by: com.amazonaws.services.iot.client.AWSIotException: TOO_MANY_REQUESTS
	at com.amazonaws.services.iot.client.core.AwsIotCompletion.get(AwsIotCompletion.java:213) ~[aws-iot-device-sdk-java-1.3.4.jar!/:na]
	at com.amazonaws.services.iot.client.shadow.AwsIotDeviceCommand.get(AwsIotDeviceCommand.java:58) ~[aws-iot-device-sdk-java-1.3.4.jar!/:na]
	at com.amazonaws.services.iot.client.shadow.AwsIotDeviceCommandManager.runCommand(AwsIotDeviceCommandManager.java:135) ~[aws-iot-device-sdk-java-1.3.4.jar!/:na]
	at com.amazonaws.services.iot.client.shadow.AwsIotDeviceCommandManager.runCommandSync(AwsIotDeviceCommandManager.java:108) ~[aws-iot-device-sdk-java-1.3.4.jar!/:na]
	at com.amazonaws.services.iot.client.shadow.AbstractAwsIotDevice.get(AbstractAwsIotDevice.java:93) ~[aws-iot-device-sdk-java-1.3.4.jar!/:na]
	at com.amazonaws.services.iot.client.AWSIotDevice.get(AWSIotDevice.java:299) ~[aws-iot-device-sdk-java-1.3.4.jar!/:na]
	at com.kl.compatec.app.central.iot.service.impl.AwsCentralIoTServiceImpl.loadCentralShadow(AwsCentralIoTServiceImpl.java:78) [classes!/:1.0.0]
	... 121 common frames omitted
```

Answer

Hi,

device shadow quotas are documented in the general reference under [AWS IoT Core endpoints and quotas](https://docs.aws.amazon.com/general/latest/gr/iot-core.html#device-shadow-limits). The TOO_MANY_REQUESTS [error](https://docs.aws.amazon.com/iot/latest/developerguide/device-shadow-error-messages.html) is generated when there are more than 10 in-flight requests on a single connection.

In case you are requesting shadows from multiple devices you can also think of using [fleet indexing](https://docs.aws.amazon.com/iot/latest/developerguide/iot-indexing.html) to index the shadow and request multiple shadow with a single query.

KR,
Philipp

Error when requesting thing shadow - TOO_MANY_REQUESTS

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