Editing Troubleshooting of Google Vertex AI Search (section)

=== Troubleshooting: "Quota exceeded for Search lite requests" Error in Discovery Engine ===

'''Issue Description''':  
When using Discovery Engine API to retrieve search results, the following error occurs:

<pre>
{
  "error" : {
    "code" : 429,
    "message" : "Quota exceeded for quota metric 'Search lite requests' and limit 'Search lite requests per minute' of service 'discoveryengine.googleapis.com' for consumer 'project_number:XXX'.",
    "status" : "RESOURCE_EXHAUSTED",
    ...
  }
}
</pre>

'''Root cause:'''

The metadata in the error response has indicated that the quota value is '''100 requests per minute'''

'''Resolution Steps''': Resolve API Quota Limit Exceedance

Option 1: Increase the delay time between requests

# Implement this timing delay in your code to prevent 429 errors. 60 seconds ÷ 100 requests = 0.6 seconds per request e.g. Add a 0.6 ~ 1 second pause between each request to stay within rate limits
# Adjust the delay time as needed based on your quota and request patterns

Option 2: Increase quota limit

# Go to the Quotas page in Google Cloud Console and find "Search lite requests per minute"
# Select the relevant quota, click "EDIT QUOTAS", and submit a request for a higher limit
# Wait for Google Cloud Support to review and approve

Option 3: Implement exponential backoff retry mechanism

# Detect HTTP 429 errors in your application and set an initial delay (e.g., 1 second)
# Increase the delay time with each failed retry (e.g., 2 seconds, 4 seconds, 8 seconds, etc.)
# Continue retrying until the request succeeds or maximum retry count is reached