Block Rotation

Introduction

SKALE Chain Block Rotation allows to limit the space on hard drive which is occupied by blocks. The current default value is 12.6GB.

Each SKALE Chain maintains a minimum to maximum number of blocks, which are 80% and 100% of the above value respectively.

Rotation is performed across 4 databases. Each database contains:

blocks
transactions and their receipts
log blooms
"best" (lastBlockHash, best block of the canonical chain)
"chainStart" (firstBlockHash, used when full chain isn’t available, for example after snapshot import)

Calls	Changes
eth_getBlockByNumber/eth_getBlockByHash	may return null
eth_getBlockTransactionCountByNumber/eth_getBlockTransactionCountByHash	may return null
eth_getUncleCountByBlockNumber/eth_getUncleCountByBlockHash	may return null
eth_getTransactionByBlockHashAndIndex/eth_getTransactionByBlockNumberAndIndex	may return null
eth_getUncleByBlockHashAndIndex/eth_getUncleByBlockNumberAndIndex	may return null
eth_getTransactionByHash	may return null
eth_getTransactionReceipt	may return null
eth_getFilterLogs/eth_getLogs	will treat removed blocks as if they have 0 logs

Calls

Changes

eth_getBlockByNumber/eth_getBlockByHash

may return null

eth_getBlockTransactionCountByNumber/eth_getBlockTransactionCountByHash

may return null

eth_getUncleCountByBlockNumber/eth_getUncleCountByBlockHash

may return null

eth_getTransactionByBlockHashAndIndex/eth_getTransactionByBlockNumberAndIndex

may return null

eth_getUncleByBlockHashAndIndex/eth_getUncleByBlockNumberAndIndex

may return null

eth_getTransactionByHash

may return null

eth_getTransactionReceipt

may return null

eth_getFilterLogs/eth_getLogs

will treat removed blocks as if they have 0 logs