DynamoDB Throttling

• Only for DynamoDB Provisioned
• If exceed provisioned RCUs or WCUs, we get ProvisionedThroughputExceededException
• Reasons
  • Hot keys: one partition key is being read too many time
  • Hot partitions
  • Very large items
• Solutions
  • Exponential Backoff (any AWS service)
  • Redistribute partition keys
  • If it's RCU issues for read, we can try DynamoDB Accelerator (DAX)

For DynamoDB Global Secondary Index (GSI)

• If the writes are throttled on the GSI, the main table will be throttled as well
  • Even if the WCU on the main tables are fine

For Dynamo Local Secondary Index (LSI)

• Use WCUs and RCUs of the main table
• No special throttling considerations