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update config
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changelog/v1.12.1-release-note.md

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## Summary
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v1.12.1 is the first maintenance release after the latest release v1.12.0. It
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comes with several important improvements and fixes for the API functionality.
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It also contains an enhanced configuration of the transaction pool, which would
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double the pool's capacity, allow it to buffer more pending transactions and
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increase the IoTeX blockchain's resilience against large traffic volume.
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This release introduces a significant enhancement to the transaction pool
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functionality. First, pending transactions that can soon be included in upcoming
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blocks will no longer be expired. Secondly, a mechanism has been implemented to
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replace less favorable pending transactions with more promising ones when the
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transaction pool approaches its capacity limit. This helps to ensure a higher
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likelihood of executing more successful transactions on the blockchain. With these
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improvement, we anticipate a relatively more stable block size, and legitimate
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transactions with higher gas prices stand a better chance of being swiftly processed
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on the blockchain, thereby enhancing the end user's experience.
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## Major Improvements
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1. Correct signature's V value in returned web3 transaction, to fix the transaction
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and responsiveness
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## Upgrade Priority
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v1.12.1 does not have a hardfork, and contains API service improvements. Only API
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nodes should upgrade in order to provide the best up-to-date service
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v1.12.1 does not have a hardfork, but contains important feature improvements to boost
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the transaction pool functionality. All delegate nodes and API nodes are strongly
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recommended to upgrade to v1.12.1 in order to provide the best up-to-date service
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| Node type | Action |
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| ---------- | ------------ |
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| Delegate | Not required |
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| Delegate | Recommended |
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| Fullnode | Not required |
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| API node | Recommended |
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config_mainnet.yaml

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actPool:
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minGasPrice: "5000000000000"
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maxNumActsPerAcct: 100
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maxNumActsPerPool: 64000
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maxGasLimitPerPool: 640000000
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maxNumActsPerPool: 32000
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maxGasLimitPerPool: 320000000
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actionExpiry: 5m
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api:

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