feat(python): expose frozen memtable metrics in memtable_stats - #8526
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Surface the `frozen_count` and `frozen_bytes` fields of `MemTableStats` through the Python binding so callers can observe how much heap is still owed to flush without reaching into Rust. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
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MemTableStatsalready tracksfrozen_countandfrozen_bytes, but the Python binding dropped them on the way out. This adds both keys to the dict returned byShardWriter.memtable_stats().frozen_count— frozen memtables in the read view: sealed-awaiting-flush, plus flushed ones still insidefrozen_memtable_grace.frozen_bytes— heap bytes still owed to flush. Together with the active memtable'sestimated_size_bytes, this approximates what backpressure meters againstmax_unflushed_memtable_bytes.Testing
Extends the closed-writer stats assertions in
test_mem_wal.pyto cover both keys. Not run locally — no built extension in this worktree, so CI is the first execution.🤖 Generated with Claude Code