mon/PaxosService: allow paxos service writes while paxos is updating

In commit f985de28f86675e974ac7842a49922a35fe24c6c I mistakenly made
is_writeable() false while paxos was updating due to a misread of
Paxos::propose_new_value() (I didn't see that it would queue).
This is problematic because it narrows the window during which each service
is writeable for no reason.

Allow service to be writeable both when paxos is active and updating.

Signed-off-by: Sage Weil <sage@inktank.com>

diff --git a/src/mon/PaxosService.h b/src/mon/PaxosService.h
index d92824f6dd6571a9f3b56cab4c492682b734f64c..5975cb94e496e7de8fb88b50b27e26726d2cbcab 100644 (file)
--- a/src/mon/PaxosService.h
+++ b/src/mon/PaxosService.h
@@ -559,7 +559,7 @@ public:
    *
    *  - we are not proposing a new version;
    *  - we are ready to be written to -- i.e., we have a pending value.
-   *  - paxos is writeable
+   *  - paxos is (active or updating)
    *
    * @returns true if writeable; false otherwise
    */
@@ -567,7 +567,7 @@ public:
     return
       !is_proposing() &&
       is_write_ready() &&
-      paxos->is_writeable();
+      (paxos->is_active() || paxos->is_updating());
   }
 
   /**