From 2174eed640ee5c012f753dd747d8f88fcd2df6c6 Mon Sep 17 00:00:00 2001
From: Duarte Nunes <duarte@scylladb.com>
Date: Fri, 12 Oct 2018 11:49:32 +0100
Subject: [PATCH] database: Expose current memory view update backlog

Expose the base replica's current memory view update backlog, which is
defined in terms of units consumed from the semaphore.

Signed-off-by: Duarte Nunes <duarte@scylladb.com>
---
 database.hh | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/database.hh b/database.hh
index 30d3a29cb2..8e7f21ae81 100644
--- a/database.hh
+++ b/database.hh
@@ -77,6 +77,7 @@
 #include <seastar/core/metrics_registration.hh>
 #include "tracing/trace_state.hh"
 #include "db/view/view.hh"
+#include "db/view/view_update_backlog.hh"
 #include "db/view/row_locking.hh"
 #include "lister.hh"
 #include "utils/phased_barrier.hh"
@@ -1450,6 +1451,10 @@ public:
         return _querier_cache;
     }
 
+    db::view::update_backlog get_view_update_backlog() const {
+        return {max_memory_pending_view_updates() - _view_update_concurrency_sem.current(), max_memory_pending_view_updates()};
+    }
+
     friend class distributed_loader;
 };