mon: wait for PaxosService readable in handle_get_version

We were waiting for the election to finish, but we need to *also* wait for
paxos to recover.  Being a peon or leader is not sufficient and we may
return a map that is still old.

Fixes: #7997
Signed-off-by: Sage Weil <sage@inktank.com>

diff --git a/src/mon/Monitor.cc b/src/mon/Monitor.cc
index ae1c857d13f2a14efae041db0430406079d485f4..b548f31bdf98d80606d79686a974b9f520a6c905 100644 (file)
--- a/src/mon/Monitor.cc
+++ b/src/mon/Monitor.cc
@@ -3538,7 +3538,6 @@ void Monitor::handle_get_version(MMonGetVersion *m)
 {
   dout(10) << "handle_get_version " << *m << dendl;
   PaxosService *svc = NULL;
-  MMonGetVersionReply *reply = NULL;
 
   MonSession *s = static_cast<MonSession *>(m->get_connection()->get_priv());
   if (!s) {
@@ -3553,22 +3552,27 @@ void Monitor::handle_get_version(MMonGetVersion *m)
     goto out;
   }
 
-  MMonGetVersionReply *reply = new MMonGetVersionReply();
-  reply->handle = m->handle;
   if (m->what == "mdsmap") {
-    reply->version = mdsmon()->mdsmap.get_epoch();
-    reply->oldest_version = mdsmon()->get_first_committed();
+    svc = mdsmon();
   } else if (m->what == "osdmap") {
-    reply->version = osdmon()->osdmap.get_epoch();
-    reply->oldest_version = osdmon()->get_first_committed();
+    svc = osdmon();
   } else if (m->what == "monmap") {
-    reply->version = monmap->get_epoch();
-    reply->oldest_version = monmon()->get_first_committed();
+    svc = monmon();
   } else {
     derr << "invalid map type " << m->what << dendl;
   }
 
-  messenger->send_message(reply, m->get_source_inst());
+  if (svc) {
+    if (!svc->is_readable()) {
+      svc->wait_for_readable(new C_RetryMessage(this, m));
+      goto out;
+    }
+    MMonGetVersionReply *reply = new MMonGetVersionReply();
+    reply->handle = m->handle;
+    reply->version = svc->get_last_committed();
+    reply->oldest_version = svc->get_first_committed();
+    messenger->send_message(reply, m->get_source_inst());
+  }
 
   m->put();