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3.3.4.4.11 COMM_COMMAND Is CMD_RETRY_FETCH

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The server MUST be the downstream partner. On receiving this packet, it indicates the upstream partner cannot handle the CMD_SEND_STAGE packet now. The server MUST resend the same CMD_SEND_STAGE packet after five seconds (see section 3.3.4.4.6.1).

In the new CMD_SEND_STAGE packet, CO_FLAG_RETRY MUST be set in the change order Flags field.