v1.5.0 Release Notes

New Features

State migration (#507)
- New JSON-RPC API to remove the unnecessary and old state/storage trie, saving the storage space for Klaytn node (Cypress) by 75% (800 GB -> 200 GB)
  - admin.startStateMigration()
  - admin.stopStateMigration()
  - admin.stateMigrationStatus
- Klaytn node currently requires about 1TB of storage space. This size of storage was a burdensome for efficient node operation, and the state migration came here to relieve this. The state migration removes the stale state/storage trie nodes which are unnecessary for new block generation and validation. Before starting a state migration, stakingInfo is saved in a database to get stakingInfo without the staled state after the state migration.
Warm-up trie node cache (#548)
- New JSON-RPC APIs to speed up the block processing by iterating the latest state trie and caching it
  - debug.startWarmUp()
  - debug.stopWarmUp()
- Until now, Klaytn node had to continuously access a database for processing a block due to uncached state trie nodes, which results in the delay in block processing. The introduced "warm-up" feature reduces this delay by iterating the last state trie and caching it.
Import blocks from String (#516)
- Importing blocks was available only with a file. Importing blocks from a string is required for some use cases.
- New JSON-RPC APIs
  - admin.importChainFromString()
Fastcache (#490)
- Fastcache as trie node cache with the autoscaled cache size, reducing memory consumption compared to Bigcache

Parameterizes triesInMemory and maxRequestContentLength (#555, #564)
Uses cached state database in TraceBlock (#546)
Improves consensus logic
- Adds unit test code (#487, #492)
- Refactors SubList/SubListWithProposer (#551)
- Prevents validators from sending consensus message if they are not in committee (#549)
- Istanbul message handler now checks whether the sender is a member of the committee or not (#545)
Prevents commit twice when a node stops (#530)
Refactors staking manager (#515)
Builds and publishes public docker image (#491)
Improves Trace API
- Adds txHash into txTraceResult (#488)
- tracer now supports CREATE2 (#489)
- tracer now reports transaction revert information (#484)
Allows DNS address string to start with numeric character for encoding URL (#482)
Removes vendor directory (#498)