Release Note

Notable changes
Wallet Performance Improvements
zcashd 5.2.0 improved the performance of wallet scanning with multithreaded batched trial decryption of Sapling outputs. However, for some nodes this resulted in growing memory usage that would eventually cause an OOM abort. We have identified the cause of the growth, and made significant improvements to reduce the memory usage of the batch scanner. In addition, the batch scanner now has a memory limit of 100 MiB.
zcashd now reports the following new metrics when -prometheusport is set:

(counter) zcashd.wallet.batchscanner.outputs.scanned
(gauge) zcashd.wallet.batchscanner.size.transactions
(gauge) zcashd.wallet.batchscanner.usage.bytes
(gauge) zcashd.wallet.synced.block.height

RPC Interface

The finalorchardroot field in the getblock result and the orchard.commitments.finalRoot field in the z_gettreestate result have been changed to match the byte ordering used for the orchard.anchor field in the getrawtransaction result. These previously produced different hash values from the orchard.anchor field due to having been byte-flipped in their internal representation in zcashd.