repair: get_sharder_for_tables: throw no_such_column_family

Insteadof std::runtime_error with a message that
resembles no_such_column_family, throw a
no_such_column_family given the keyspace and table uuid.

The latter can be explicitly caught and handled if needed.

Refs #8612

Test: unit(dev)
Signed-off-by: Benny Halevy <bhalevy@scylladb.com>
Message-Id: <20210608113605.91292-1-bhalevy@scylladb.com>

database.cc

@@ -1189,6 +1189,11 @@ no_such_column_family::no_such_column_family(std::string_view ks_name, std::stri
 {
 }
 
+no_such_column_family::no_such_column_family(std::string_view ks_name, const utils::UUID& uuid)
+    : runtime_error{format("Can't find a column family with UUID {} in keyspace {}", uuid, ks_name)}
+{
+}
+
 column_family& database::find_column_family(const schema_ptr& schema) {
     return find_column_family(schema->id());
 }

database.hh

@@ -1201,6 +1201,7 @@ class no_such_column_family : public std::runtime_error {
 public:
     no_such_column_family(const utils::UUID& uuid);
     no_such_column_family(std::string_view ks_name, std::string_view cf_name);
+    no_such_column_family(std::string_view ks_name, const utils::UUID& uuid);
 };
 
 

repair/repair.cc

@@ -581,7 +581,7 @@ get_sharder_for_tables(seastar::sharded<database>& db, const sstring& keyspace,
         try {
             s = db.local().find_column_family(table_ids[idx]).schema();
         } catch(...) {
-            throw std::runtime_error(format("No column family '{}' in keyspace '{}'", table_ids[idx], keyspace));
+            throw no_such_column_family(keyspace, table_ids[idx]);
         }
         if (last_s && last_s->get_sharder() != s->get_sharder()) {
             throw std::runtime_error(