Provide a REPAIRED preview that audits already-reconciled data across replicas for a tracked keyspace, validating that data backing reconciled offsets is byte-identical across replicas. Reject the operation if the keyspace isn't fully migrated to mutation tracking or if topology changes during any phase. ALL and UNREPAIRED previews on tracked keyspaces are a separate (simpler) design — out of scope here.
Identical to classic REPAIRED preview:
Introduces a thread-local read-ahead buffer for sequential scan workloads (compaction, range queries) over compressed SSTables. The existing path issued one channel.read() syscall per compressed chunk (~64 KiB); by pre-reading 256 KiB at a time and serving subsequent chunk reads from that in-process buffer, the patch cuts syscall count ~4× for sequential scans without touching the random-access path.
| GOVERSION=$(brew list go | head -n 1 | cut -d '/' -f 6) | |
| export GOROOT=$(brew --prefix)/Cellar/go/$GOVERSION/libexec | |
| export GOPATH=/Users/[user]/go |
| brew install hub | |
| ...then in ~/.gitconfig... | |
| [alias] | |
| # public repo | |
| cpr = "!f() { curl https://github.com/cqlengine/cqlengine/pull/${1}.patch | git apply -3 - ; }; f " | |
| # private repo | |
| spr = "!f() { hub apply -3 https://github.com/[your org]/[your project]/pull/${1} ; }; f " |