When the epoch has not increased since the last cleanup cycle, it means we can clear the pool, not that the pool is empty.

ras0219-msft · ras0219-msft · commit 08f59008c453 · 2016-07-25T15:10:25.000-07:00
diff --git a/Release/src/http/client/http_client_asio.cpp b/Release/src/http/client/http_client_asio.cpp
@@ -316,7 +316,7 @@ class asio_connection_pool : public std::enable_shared_from_this<asio_connection
             _ASSERTE(self.m_self_reference != nullptr);
             if (self.m_prev_epoch == self.m_epoch)
             {
-                assert(self.m_connections.empty());
+                self.m_connections.clear();
                 self.m_self_reference = nullptr;
             }
             else

Original file line number	Diff line number	Diff line change
`@@ -316,7 +316,7 @@ class asio_connection_pool : public std::enable_shared_from_this<asio_connection`
`316`	`316`	`_ASSERTE(self.m_self_reference != nullptr);`
`317`	`317`	`if (self.m_prev_epoch == self.m_epoch)`
`318`	`318`	`{`
`319`		`- assert(self.m_connections.empty());`
	`319`	`+ self.m_connections.clear();`
`320`	`320`	`self.m_self_reference = nullptr;`
`321`	`321`	`}`
`322`	`322`	`else`