Lower validator thread priority to normal.

src/chasers/chaser_validate.cpp

@@ -42,13 +42,12 @@ BC_PUSH_WARNING(NO_VALUE_OR_CONST_REF_SHARED_PTR)
 BC_PUSH_WARNING(SMART_PTR_NOT_NEEDED)
 BC_PUSH_WARNING(NO_THROW_IN_NOEXCEPT)
 
-// High thread priority ensures download does not overflow validation backlog.
 chaser_validate::chaser_validate(full_node& node) NOEXCEPT
   : chaser(node),
     initial_subsidy_(node.config().bitcoin.initial_subsidy()),
     subsidy_interval_(node.config().bitcoin.subsidy_interval_blocks),
     threadpool_(std::max(node.config().node.threads, 1_u32),
-        network::thread_priority::high)
+        network::thread_priority::normal)
 {
 }
 
@@ -169,7 +168,7 @@ void chaser_validate::do_bump(height_t) NOEXCEPT
 
         // TODO: make this more flexible/configurable.
         // Wait until the gap is filled at a current height.
-        if (ec == database::error::unassociated || !is_current(link))
+        if (ec == database::error::unassociated)//// || !is_current(link))
             return;
 
         // complete_block always follows and decrements.