1 files changed, 111 insertions, 0 deletions
diff --git a/src/mon/MonmapMonitor.h b/src/mon/MonmapMonitor.h
new file mode 100644
index 000000000..dc75e9620
--- /dev/null
+++ b/src/mon/MonmapMonitor.h
@@ -0,0 +1,111 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- 
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2009 Sage Weil <sage@newdream.net>
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software 
+ * Foundation.  See file COPYING.
+ * 
+ */
+
+/*
+ * The Monmap Monitor is used to track the monitors in the cluster.
+ */
+
+#ifndef CEPH_MONMAPMONITOR_H
+#define CEPH_MONMAPMONITOR_H
+
+#include <map>
+#include <set>
+
+#include "include/types.h"
+#include "msg/Messenger.h"
+
+#include "PaxosService.h"
+#include "MonMap.h"
+#include "MonitorDBStore.h"
+
+class MonmapMonitor : public PaxosService {
+ public:
+  MonmapMonitor(Monitor &mn, Paxos &p, const std::string& service_name)
+    : PaxosService(mn, p, service_name)
+  {
+  }
+  MonMap pending_map; //the pending map awaiting passage
+
+  void create_initial() override;
+
+  void update_from_paxos(bool *need_bootstrap) override;
+
+  void create_pending() override;
+
+  void encode_pending(MonitorDBStore::TransactionRef t) override;
+  // we always encode the full map; we have no use for full versions
+  void encode_full(MonitorDBStore::TransactionRef t) override { }
+
+  void on_active() override;
+  void apply_mon_features(const mon_feature_t& features,
+			  ceph_release_t min_mon_release);
+
+  void dump_info(ceph::Formatter *f);
+
+  bool preprocess_query(MonOpRequestRef op) override;
+  bool prepare_update(MonOpRequestRef op) override;
+
+  bool preprocess_join(MonOpRequestRef op);
+  bool prepare_join(MonOpRequestRef op);
+
+  bool preprocess_command(MonOpRequestRef op);
+  bool prepare_command(MonOpRequestRef op);
+
+  int get_monmap(ceph::buffer::list &bl);
+
+  /*
+   * Since monitors are pretty
+   * important, this implementation will just write 0.0.
+   */
+  bool should_propose(double& delay) override;
+
+  void check_sub(Subscription *sub);
+
+  void tick() override;
+
+private:
+  void check_subs();
+  ceph::buffer::list monmap_bl;
+  /**
+   * Check validity of inputs and monitor state to
+   * engage stretch mode. Designed to be used with
+   * OSDMonitor::try_enable_stretch_mode() where we call both twice,
+   * first with commit=false to validate.
+   * @param ss: a stringstream to write errors into
+   * @param okay: Filled to true if okay, false if validation fails
+   * @param errcode: filled with -errno if there's a problem
+   * @param commit: true if we should commit the change, false if just testing
+   * @param tiebreaker_mon: the name of the monitor to declare tiebreaker
+   * @param dividing_bucket: the bucket type (eg 'dc') that divides the cluster
+   */
+  void try_enable_stretch_mode(std::stringstream& ss, bool *okay,
+			       int *errcode, bool commit,
+			       const std::string& tiebreaker_mon,
+			       const std::string& dividing_bucket);
+
+public:
+  /**
+   * Set us to degraded stretch mode. Put the dead_mons in
+   * the MonMap.
+   */
+  void trigger_degraded_stretch_mode(const std::set<std::string>& dead_mons);
+  /**
+   * Set us to healthy stretch mode: clear out the
+   * down list to allow any non-tiebreaker mon to be the leader again.
+   */
+  void trigger_healthy_stretch_mode();
+};
+
+
+#endif