nodedb 0.4.0

Local-first, real-time, edge-to-cloud hybrid database for multi-modal workloads
Documentation 
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// SPDX-License-Identifier: BUSL-1.1

//! Array engine WAL replay: rebuilds tile state after crash.

use crate::data::executor::core_loop::CoreLoop;
use std::sync::Arc;

impl CoreLoop {
    fn ensure_array_open_for_replay(
        &mut self,
        array_id: &nodedb_array::types::ArrayId,
    ) -> crate::Result<()> {
        let (schema_msgpack, schema_hash) = {
            let cat = self
                .array_catalog
                .read()
                .map_err(|_| crate::Error::Internal {
                    detail: "array catalog lock poisoned during WAL replay".into(),
                })?;
            let entry =
                cat.lookup_by_name(&array_id.name)
                    .ok_or_else(|| crate::Error::Internal {
                        detail: format!(
                            "array '{}' missing from catalog during WAL replay",
                            array_id.name
                        ),
                    })?;
            (entry.schema_msgpack.clone(), entry.schema_hash)
        };
        let schema = zerompk::from_msgpack::<nodedb_array::schema::ArraySchema>(&schema_msgpack)
            .map_err(|e| crate::Error::Serialization {
                format: "msgpack".into(),
                detail: format!("array schema decode during WAL replay: {e}"),
            })?;
        self.array_engine
            .open_array(array_id.clone(), Arc::new(schema), schema_hash)
            .map_err(|e| crate::Error::Internal {
                detail: format!("array open during WAL replay: {e}"),
            })?;
        Ok(())
    }

    pub fn replay_array_wal(
        &mut self,
        records: &[nodedb_wal::WalRecord],
        num_cores: usize,
        tombstones: &nodedb_wal::TombstoneSet,
    ) {
        use crate::engine::array::wal::{decode_delete_with_version, decode_put_with_version};
        use nodedb_wal::record::RecordType;

        let mut puts = 0usize;
        let mut deletes = 0usize;

        for record in records {
            let logical_type = record.logical_record_type();
            let record_type = RecordType::from_raw(logical_type);
            let is_put = record_type == Some(RecordType::ArrayPut);
            let is_delete = record_type == Some(RecordType::ArrayDelete);
            if !is_put && !is_delete {
                continue;
            }

            let vshard_id = record.header.vshard_id as usize;
            let target_core = if num_cores > 0 {
                vshard_id % num_cores
            } else {
                0
            };
            if target_core != self.core_id {
                continue;
            }

            let tenant_id = record.header.tenant_id;
            let record_lsn = record.header.lsn;

            if is_put {
                let Ok(payload) = decode_put_with_version(&record.payload) else {
                    continue;
                };
                if tombstones.is_tombstoned(
                    record.header.database_id,
                    tenant_id,
                    &payload.array_id.name,
                    record_lsn,
                ) {
                    continue;
                }
                if self
                    .ensure_array_open_for_replay(&payload.array_id)
                    .is_err()
                {
                    continue;
                }
                let cell_count = payload.cells.len();
                let prov = payload.provenance.clone();
                if self
                    .array_engine
                    .put_cells(&payload.array_id, payload.cells, record_lsn)
                    .is_ok()
                {
                    puts += cell_count;
                    // Rebuild the per-core HWM frontier from the WAL record's
                    // provenance. No fence check here — replay records are already
                    // durable and ordered; just advance the frontier.
                    if let Some(p) = &prov {
                        self.sync_commit(p);
                    }
                }
                continue;
            }

            let Ok(payload) = decode_delete_with_version(&record.payload) else {
                continue;
            };
            if tombstones.is_tombstoned(
                record.header.database_id,
                tenant_id,
                &payload.array_id.name,
                record_lsn,
            ) {
                continue;
            }
            if self
                .ensure_array_open_for_replay(&payload.array_id)
                .is_err()
            {
                continue;
            }
            let cell_count = payload.cells.len();
            let prov = payload.provenance.clone();
            if self
                .array_engine
                .delete_cells(&payload.array_id, payload.cells, record_lsn)
                .is_ok()
            {
                deletes += cell_count;
                if let Some(p) = &prov {
                    self.sync_commit(p);
                }
            }
        }

        if puts > 0 || deletes > 0 {
            tracing::info!(
                core = self.core_id,
                puts,
                deletes,
                "WAL array replay complete"
            );
        }
    }
}