flake: retry GetUSDCBalance RPC calls with exponential backoff#3602
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flake: retry GetUSDCBalance RPC calls with exponential backoff#3602
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packethog
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Apr 29, 2026
The Solana RPC can return HTTP 429 "Too many requests" when fetching USDC ATA balances, causing qa_multicast_settlement_test to fail at the record_balance_before_pay step. Wrap GetTokenAccountBalance with exponential backoff (up to 5 retries, 30s max) using cenkalti/backoff, matching the retry pattern already used by getProgramDataWithRetry.
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Summary
GetTokenAccountBalanceRPC call inGetUSDCBalancewith exponential backoff (up to 5 retries, 30s max elapsed) to handle transient Solana RPC HTTP 429 rate-limit errorscenkalti/backoff/v4, matching the existinggetProgramDataWithRetrypattern in the QA test helpersTestQA_MulticastSettlement/record_balance_before_payflake seen in recent testnet QA runsTesting Verification
require.Eventuallyloops (validate_balance_after_pay, validate_balance_after_withdraw) are unaffected — they already tolerate errors by returning false, and the added retry only adds a brief delay before surfacing the error