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Replace the multilevel cache system with a journaling system
### Prize Bounty
The Prize Bounty is 21 ETH.
### Challenge Description
Currently the RSKj nodes employs a multi-level cache system to track changes to the world state.
This allows to revert the state in case of REVERT opcode or OOG.
The main class involved is MutableTrieCache.java. Every new contract called gets a new MutableTrieCache on top of the previous one.
This implementation is sub-optimal in terms of efficiency. Put/get are O(N) operations, where N is the level of the cache while revert is O(1).
It is preferable to use a journaling cache "JournalTrieCache" that:
- Stores the latest values for key/values that have changed, but it is a pass-through for keys that have not.
- Past values to changed keys are stored in a log, with entries of type (key,oldValue). Reversal implies going over the log in reverse order and reversing the changes made. Recursive deletion may require special functionality, as the current system marks accounts to imply recursive deletion.
The task is to change the structure of the node such that: for each block a MutableTrieCache is used, but for each transaction a JournalTrieCache is used (and the same object is is used for all internal CALL frames).
### Submission Requirements
A valid submission should modify the RSKj node to implement JournalTrieCache integrated to transaction processing, pass all unit tests and synchronize with the RSK mainnet.
The code should respect the contribution standards specified in https://github.com/rsksmart/rskj/blob/master/CONTRIBUTING.md
### Submission Deadline
The deadline for submissions is November 11, 2019.
### Judging Criteria
The prize will be awarded to the best valid submission.
### Winner Announcement Date
The submission will be reviewed between November 11 and November 18. Winners will be privately notified before a public announcement of all hackathon prices given by IOV Labs. The announcement and prize payouts will occur before November 31, 2019.
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