[#639,!410] clear cache_ptr_ before unloading library

diff --git a/src/lib/dhcpsrv/host_mgr.cc b/src/lib/dhcpsrv/host_mgr.cc
index 94859dfad30a98f906a6e77adb36f7b4a0a97823..4ed8b9ee23faa5c7b24a382d7ce9a92ae46aab5a 100644 (file)
--- a/src/lib/dhcpsrv/host_mgr.cc
+++ b/src/lib/dhcpsrv/host_mgr.cc
@@ -48,6 +48,9 @@ HostMgr::addBackend(const std::string& access) {
 
 bool
 HostMgr::delBackend(const std::string& db_type) {
+    if (getHostMgrPtr()->cache_ptr_->getType() == db_type) {
+        getHostMgrPtr()->cache_ptr_.reset();
+    }
     return (HostDataSourceFactory::del(getHostMgrPtr()->alternate_sources_, db_type));
 }