AWS Polly LexiconSizeExceededException

The size of the lexicon exceeds the allowed limit.

Understanding AWS Polly

AWS Polly is a service that turns text into lifelike speech, allowing developers to create applications that can talk. It is part of the suite of Voice AI APIs offered by Amazon Web Services, designed to enhance user interaction with applications through voice.

Identifying the Symptom

When working with AWS Polly, you might encounter the LexiconSizeExceededException. This error is typically observed when attempting to use a lexicon that is too large for the service to process.

What is a Lexicon?

A lexicon in AWS Polly is a file that allows you to customize the pronunciation of words. This is particularly useful for names, technical terms, or any word that Polly might not pronounce correctly by default.

Details About the Issue

The LexiconSizeExceededException is thrown when the size of the lexicon exceeds the allowed limit set by AWS Polly. This limit is in place to ensure optimal performance and resource management within the service.

Understanding the Error Code

The error code LexiconSizeExceededException indicates that the lexicon file you are trying to use is too large. AWS Polly has specific size constraints for lexicons, and exceeding these constraints triggers this exception.

Steps to Fix the Issue

To resolve the LexiconSizeExceededException, you need to reduce the size of your lexicon or split it into smaller, manageable parts.

Step 1: Review Lexicon Size

First, check the size of your lexicon file. AWS Polly has a maximum size limit for lexicons, which is currently set at 64 KB. Ensure your lexicon does not exceed this limit.

Step 2: Split the Lexicon

If your lexicon is too large, consider splitting it into multiple smaller lexicons. You can manage multiple lexicons within AWS Polly and apply them as needed.

aws polly put-lexicon --name LexiconPart1 --content file://lexicon-part1.pls
aws polly put-lexicon --name LexiconPart2 --content file://lexicon-part2.pls

Step 3: Optimize Lexicon Content

Review the content of your lexicon for any unnecessary entries or redundancies. Removing these can help reduce the overall size.

Additional Resources

For more information on managing lexicons in AWS Polly, visit the AWS Polly Documentation. You can also explore the AWS Polly Product Page for more insights into its capabilities and features.

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