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diff --git a/src/ceph/src/rgw/rgw_period_pusher.h b/src/ceph/src/rgw/rgw_period_pusher.h
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+++ b/src/ceph/src/rgw/rgw_period_pusher.h
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+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#ifndef RGW_PERIOD_PUSHER_H
+#define RGW_PERIOD_PUSHER_H
+
+#include <memory>
+#include <mutex>
+#include <vector>
+
+#include "rgw_realm_reloader.h"
+
+class RGWRados;
+class RGWPeriod;
+
+// RGWRealmNotify payload for push coordination
+using RGWZonesNeedPeriod = RGWPeriod;
+
+/**
+ * RGWPeriodPusher coordinates with other nodes via the realm watcher to manage
+ * the responsibility for pushing period updates to other zones or zonegroups.
+ */
+class RGWPeriodPusher final : public RGWRealmWatcher::Watcher,
+                              public RGWRealmReloader::Pauser {
+ public:
+  RGWPeriodPusher(RGWRados* store);
+  ~RGWPeriodPusher() override;
+
+  /// respond to realm notifications by pushing new periods to other zones
+  void handle_notify(RGWRealmNotify type, bufferlist::iterator& p) override;
+
+  /// avoid accessing RGWRados while dynamic reconfiguration is in progress.
+  /// notifications will be enqueued until resume()
+  void pause() override;
+
+  /// continue processing notifications with a new RGWRados instance
+  void resume(RGWRados* store) override;
+
+ private:
+  void handle_notify(RGWZonesNeedPeriod&& period);
+
+  CephContext *const cct;
+  RGWRados* store;
+
+  std::mutex mutex;
+  epoch_t realm_epoch{0}; //< the current realm epoch being sent
+  epoch_t period_epoch{0}; //< the current period epoch being sent
+
+  /// while paused for reconfiguration, we need to queue up notifications
+  std::vector<RGWZonesNeedPeriod> pending_periods;
+
+  class CRThread; //< contains thread, coroutine manager, http manager
+  std::unique_ptr<CRThread> cr_thread; //< thread to run the push coroutines
+};
+
+#endif // RGW_PERIOD_PUSHER_H