Submitting multiple transactions

This section outlies some best practices for submitting multiple transactions. Users who need to submit many transactions one after the other can run into a problem when the mempool becomes full. This is known as high throughput. If the user continues to submit transactions after the mempool becomes full, some transactions may not be accepted.

The system as a whole has never guaranteed the reliability of transaction submission. It is impossible to provide such a guarantee in a distributed system like Cardano. Submitting agents are required to handle resubmission logic in an appropriate way.

The correct endpoint to use is the cardano-submit-api. When the mempool is full, the thread is blocked. Therefore, the API user can queue up multiple transactions that get processed as soon as mempool capacity becomes available. However, the application needs to allow for the fact that the number of in-flight transactions is limited by the number of open files allowed by the operating system. If this is exceeded, then cardano-submit-api just exits, so further requests are not served. Increasing the number of open files allowed by the operating system with ulimit will increase the available number of in-flight transactions.

A simpler alternative is to use the cardano-submit-api serially or with very low concurrency to minimize the need for sophisticated queue management.

It is a general rule that simplicity increases robustness; if possible, just submit a transaction and wait until it is confirmed before submitting the next one.

© IOHK 2015 - 2021

Cardano Logo

Cardano is an open-source project.

Cardano is a software platform ONLY and does not conduct any independent diligence on, or substantive review of, any blockchain asset, digital currency, cryptocurrency or associated funds. You are fully and solely responsible for evaluating your investments, for determining whether you will exchange blockchain assets based on your own judgement, and for all your decisions as to whether to exchange blockchain assets with Cardano. In many cases, blockchain assets you exchange on the basis of your research may not increase in value, and may decrease in value. Similarly, blockchain assets you exchange on the basis of your research may fall or rise in value after your exchange.

Past performance is not indicative of future results. Any investment in blockchain assets involves the risk of loss of part or all of your investment. The value of the blockchain assets you exchange is subject to market and other investment risks