Very minor changes

src/table/table_sharded.rs

@@ -44,6 +44,7 @@ impl TableReplication for TableShardedReplication {
 	fn split_points(&self, ring: &Ring) -> Vec<Hash> {
 		let mut ret = vec![];
 
+		ret.push([0u8; 32].into());
 		for entry in ring.ring.iter() {
 			ret.push(entry.location);
 		}

src/table/table_sync.rs

@@ -18,10 +18,14 @@ use garage_util::error::Error;
 use crate::*;
 
 const MAX_DEPTH: usize = 16;
-const SCAN_INTERVAL: Duration = Duration::from_secs(3600);
-const CHECKSUM_CACHE_TIMEOUT: Duration = Duration::from_secs(1800);
 const TABLE_SYNC_RPC_TIMEOUT: Duration = Duration::from_secs(30);
 
+// Scan & sync every 12 hours
+const SCAN_INTERVAL: Duration = Duration::from_secs(12 * 60 * 60);
+
+// Expire cache after 30 minutes
+const CHECKSUM_CACHE_TIMEOUT: Duration = Duration::from_secs(30 * 60);
+
 pub struct TableSyncer<F: TableSchema, R: TableReplication> {
 	table: Arc<Table<F, R>>,
 	todo: Mutex<SyncTodo>,
@@ -797,6 +801,10 @@ impl SyncTodo {
 		for i in 0..split_points.len() - 1 {
 			let begin = split_points[i];
 			let end = split_points[i + 1];
+			if begin == end {
+				continue;
+			}
+
 			let nodes = table.replication.replication_nodes(&begin, &ring);
 
 			let retain = nodes.contains(&my_id);