(connection leak) occurs due botocore.exceptions.EventStreamError in boto3.client( "bedrock-agent-runtime" ).invoke_agent

[FireballDWF]

Describe the bug

When a throttlingException gets raised as a botocore.exceptions.EventStreamError by client.invoke_agent when client=boto3.client( "bedrock-agent-runtime" ), a side effect is a Connection Leak.

Figure it is in the ServiceTeam's interest to get these Connection Leaks closed within boto3 or botocore as doing so would result in fewer open and idle connections to their service endpoints.

Regression Issue

• [ ] Select this option if this issue appears to be a regression.

Expected Behavior

connection is returned to the pool before the botocore.exceptions.EventStreamError is raised

Current Behavior

Connection Leak can be observed by receiving the following log when the number of throttlingExceptions is equal to the value of max_pool_connections

[2025-05-26 23:19:33,755] p43062 {connectionpool.py:327} WARNING - Connection pool is full, discarding connection: bedrock-agent-runtime.us-east-1.amazonaws.com. Connection pool size: 10

Reproduction Steps

Have a Terraform based IaC+python file to reproduce it 100% of the time, but it is not concise yet. Submitting this report in the meantime as this report should be sufficient to do a code review of the relevant handling of the connection from the exception. If targeted Code Review can't find it, slack filiatra@ and I'll work on creating a branch of my work which is more concise for reproducing it.

Possible Solution

No response

Additional Information/Context

No response

SDK version used

1.38.23

Environment details (OS name and version, etc.)

MacOS Sequoia 15.5 with python 3.13.3_1 (Homebrew) env

[adev-code]

Hello @FireballDWF, thanks for reaching out. For troubleshooting, can you provide the full debug logs by adding boto3.set_stream_logger('') and removing all sensitive information. Also, if possible to provide code replication. Thank you.

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