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You get Internal Service Exception on AWS Glue Crawler due to various reasons such as inconsistent data structure from upstreams, or if your data catalog has larger number of columns or nested structure that might exceeded the schema size limit. You can first check your crawler logs to see the possible errors. You can also refer https://repost.aws/knowledge-center/glue-crawler-internal-service-exception for further possible conditions that might triggered the exception. If the mentioned reasons don't apply to you it is better to open support case.
answered 8 months ago
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