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diff --git a/src/ceph/src/test/rbd_mirror/image_replayer/test_mock_EventPreprocessor.cc b/src/ceph/src/test/rbd_mirror/image_replayer/test_mock_EventPreprocessor.cc
new file mode 100644
index 0000000..d7bbce2
--- /dev/null
+++ b/src/ceph/src/test/rbd_mirror/image_replayer/test_mock_EventPreprocessor.cc
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+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#include "test/rbd_mirror/test_mock_fixture.h"
+#include "librbd/journal/Types.h"
+#include "librbd/journal/TypeTraits.h"
+#include "tools/rbd_mirror/image_replayer/EventPreprocessor.h"
+#include "tools/rbd_mirror/Threads.h"
+#include "test/journal/mock/MockJournaler.h"
+#include "test/librbd/mock/MockImageCtx.h"
+
+namespace librbd {
+
+namespace {
+
+struct MockTestImageCtx : public librbd::MockImageCtx {
+  MockTestImageCtx(librbd::ImageCtx &image_ctx)
+    : librbd::MockImageCtx(image_ctx) {
+  }
+};
+
+} // anonymous namespace
+
+namespace journal {
+
+template <>
+struct TypeTraits<librbd::MockTestImageCtx> {
+  typedef ::journal::MockJournaler Journaler;
+};
+
+} // namespace journal
+} // namespace librbd
+
+// template definitions
+#include "tools/rbd_mirror/image_replayer/EventPreprocessor.cc"
+template class rbd::mirror::image_replayer::EventPreprocessor<librbd::MockTestImageCtx>;
+
+namespace rbd {
+namespace mirror {
+namespace image_replayer {
+
+using testing::_;
+using testing::WithArg;
+
+class TestMockImageReplayerEventPreprocessor : public TestMockFixture {
+public:
+  typedef EventPreprocessor<librbd::MockTestImageCtx> MockEventPreprocessor;
+
+  void SetUp() override {
+    TestMockFixture::SetUp();
+
+    librbd::RBD rbd;
+    ASSERT_EQ(0, create_image(rbd, m_local_io_ctx, m_image_name, m_image_size));
+    ASSERT_EQ(0, open_image(m_local_io_ctx, m_image_name, &m_local_image_ctx));
+  }
+
+  void expect_image_refresh(librbd::MockTestImageCtx &mock_remote_image_ctx, int r) {
+    EXPECT_CALL(*mock_remote_image_ctx.state, refresh(_))
+      .WillOnce(CompleteContext(r));
+  }
+
+  void expect_update_client(journal::MockJournaler &mock_journaler, int r) {
+    EXPECT_CALL(mock_journaler, update_client(_, _))
+      .WillOnce(WithArg<1>(CompleteContext(r)));
+  }
+
+  librbd::ImageCtx *m_local_image_ctx;
+  librbd::journal::MirrorPeerClientMeta m_client_meta;
+
+};
+
+TEST_F(TestMockImageReplayerEventPreprocessor, IsNotRequired) {
+  librbd::MockTestImageCtx mock_local_image_ctx(*m_local_image_ctx);
+  ::journal::MockJournaler mock_remote_journaler;
+
+  MockEventPreprocessor event_preprocessor(mock_local_image_ctx,
+                                           mock_remote_journaler,
+                                           "local mirror uuid",
+                                           &m_client_meta,
+                                           m_threads->work_queue);
+
+  librbd::journal::EventEntry event_entry{librbd::journal::RenameEvent{}};
+  ASSERT_FALSE(event_preprocessor.is_required(event_entry));
+}
+
+TEST_F(TestMockImageReplayerEventPreprocessor, IsRequiredSnapMapPrune) {
+  librbd::MockTestImageCtx mock_local_image_ctx(*m_local_image_ctx);
+  ::journal::MockJournaler mock_remote_journaler;
+
+  m_client_meta.snap_seqs = {{1, 2}, {3, 4}};
+  MockEventPreprocessor event_preprocessor(mock_local_image_ctx,
+                                           mock_remote_journaler,
+                                           "local mirror uuid",
+                                           &m_client_meta,
+                                           m_threads->work_queue);
+
+  librbd::journal::EventEntry event_entry{librbd::journal::RenameEvent{}};
+  ASSERT_TRUE(event_preprocessor.is_required(event_entry));
+}
+
+TEST_F(TestMockImageReplayerEventPreprocessor, IsRequiredSnapRename) {
+  librbd::MockTestImageCtx mock_local_image_ctx(*m_local_image_ctx);
+  ::journal::MockJournaler mock_remote_journaler;
+
+  MockEventPreprocessor event_preprocessor(mock_local_image_ctx,
+                                           mock_remote_journaler,
+                                           "local mirror uuid",
+                                           &m_client_meta,
+                                           m_threads->work_queue);
+
+  librbd::journal::EventEntry event_entry{librbd::journal::SnapRenameEvent{}};
+  ASSERT_TRUE(event_preprocessor.is_required(event_entry));
+}
+
+TEST_F(TestMockImageReplayerEventPreprocessor, PreprocessSnapMapPrune) {
+  librbd::MockTestImageCtx mock_local_image_ctx(*m_local_image_ctx);
+  ::journal::MockJournaler mock_remote_journaler;
+
+  expect_image_refresh(mock_local_image_ctx, 0);
+  expect_update_client(mock_remote_journaler, 0);
+
+  mock_local_image_ctx.snap_info = {
+    {6, librbd::SnapInfo{"snap", cls::rbd::UserSnapshotNamespace(), 0U, {}, 0U, 0U, utime_t()}}};
+  m_client_meta.snap_seqs = {{1, 2}, {3, 4}, {5, 6}};
+  MockEventPreprocessor event_preprocessor(mock_local_image_ctx,
+                                           mock_remote_journaler,
+                                           "local mirror uuid",
+                                           &m_client_meta,
+                                           m_threads->work_queue);
+
+  librbd::journal::EventEntry event_entry{librbd::journal::RenameEvent{}};
+  C_SaferCond ctx;
+  event_preprocessor.preprocess(&event_entry, &ctx);
+  ASSERT_EQ(0, ctx.wait());
+
+  librbd::journal::MirrorPeerClientMeta::SnapSeqs expected_snap_seqs = {{5, 6}};
+  ASSERT_EQ(expected_snap_seqs, m_client_meta.snap_seqs);
+}
+
+TEST_F(TestMockImageReplayerEventPreprocessor, PreprocessSnapRename) {
+  librbd::MockTestImageCtx mock_local_image_ctx(*m_local_image_ctx);
+  ::journal::MockJournaler mock_remote_journaler;
+
+  expect_image_refresh(mock_local_image_ctx, 0);
+  expect_update_client(mock_remote_journaler, 0);
+
+  mock_local_image_ctx.snap_ids = {{{cls::rbd::UserSnapshotNamespace(), "snap"}, 6}};
+  mock_local_image_ctx.snap_info = {
+    {6, librbd::SnapInfo{"snap", cls::rbd::UserSnapshotNamespace(), 0U, {}, 0U, 0U, utime_t()}}};
+  MockEventPreprocessor event_preprocessor(mock_local_image_ctx,
+                                           mock_remote_journaler,
+                                           "local mirror uuid",
+                                           &m_client_meta,
+                                           m_threads->work_queue);
+
+  librbd::journal::EventEntry event_entry{
+    librbd::journal::SnapRenameEvent{0, 5, "snap", "new_snap"}};
+  C_SaferCond ctx;
+  event_preprocessor.preprocess(&event_entry, &ctx);
+  ASSERT_EQ(0, ctx.wait());
+
+  librbd::journal::MirrorPeerClientMeta::SnapSeqs expected_snap_seqs = {{5, 6}};
+  ASSERT_EQ(expected_snap_seqs, m_client_meta.snap_seqs);
+
+  librbd::journal::SnapRenameEvent *event =
+    boost::get<librbd::journal::SnapRenameEvent>(&event_entry.event);
+  ASSERT_EQ(6U, event->snap_id);
+}
+
+TEST_F(TestMockImageReplayerEventPreprocessor, PreprocessSnapRenameMissing) {
+  librbd::MockTestImageCtx mock_local_image_ctx(*m_local_image_ctx);
+  ::journal::MockJournaler mock_remote_journaler;
+
+  expect_image_refresh(mock_local_image_ctx, 0);
+
+  MockEventPreprocessor event_preprocessor(mock_local_image_ctx,
+                                           mock_remote_journaler,
+                                           "local mirror uuid",
+                                           &m_client_meta,
+                                           m_threads->work_queue);
+
+  librbd::journal::EventEntry event_entry{
+    librbd::journal::SnapRenameEvent{0, 5, "snap", "new_snap"}};
+  C_SaferCond ctx;
+  event_preprocessor.preprocess(&event_entry, &ctx);
+  ASSERT_EQ(-ENOENT, ctx.wait());
+
+  librbd::journal::SnapRenameEvent *event =
+    boost::get<librbd::journal::SnapRenameEvent>(&event_entry.event);
+  ASSERT_EQ(CEPH_NOSNAP, event->snap_id);
+}
+
+TEST_F(TestMockImageReplayerEventPreprocessor, PreprocessSnapRenameKnown) {
+  librbd::MockTestImageCtx mock_local_image_ctx(*m_local_image_ctx);
+  ::journal::MockJournaler mock_remote_journaler;
+
+  expect_image_refresh(mock_local_image_ctx, 0);
+
+  mock_local_image_ctx.snap_info = {
+    {6, librbd::SnapInfo{"snap", cls::rbd::UserSnapshotNamespace(), 0U, {}, 0U, 0U, utime_t()}}};
+  m_client_meta.snap_seqs = {{5, 6}};
+  MockEventPreprocessor event_preprocessor(mock_local_image_ctx,
+                                           mock_remote_journaler,
+                                           "local mirror uuid",
+                                           &m_client_meta,
+                                           m_threads->work_queue);
+
+  librbd::journal::EventEntry event_entry{
+    librbd::journal::SnapRenameEvent{0, 5, "snap", "new_snap"}};
+  C_SaferCond ctx;
+  event_preprocessor.preprocess(&event_entry, &ctx);
+  ASSERT_EQ(0, ctx.wait());
+
+  librbd::journal::MirrorPeerClientMeta::SnapSeqs expected_snap_seqs = {{5, 6}};
+  ASSERT_EQ(expected_snap_seqs, m_client_meta.snap_seqs);
+
+  librbd::journal::SnapRenameEvent *event =
+    boost::get<librbd::journal::SnapRenameEvent>(&event_entry.event);
+  ASSERT_EQ(6U, event->snap_id);
+}
+
+TEST_F(TestMockImageReplayerEventPreprocessor, PreprocessRefreshError) {
+  librbd::MockTestImageCtx mock_local_image_ctx(*m_local_image_ctx);
+  ::journal::MockJournaler mock_remote_journaler;
+
+  expect_image_refresh(mock_local_image_ctx, -EINVAL);
+
+  MockEventPreprocessor event_preprocessor(mock_local_image_ctx,
+                                           mock_remote_journaler,
+                                           "local mirror uuid",
+                                           &m_client_meta,
+                                           m_threads->work_queue);
+
+  librbd::journal::EventEntry event_entry{librbd::journal::RenameEvent{}};
+  C_SaferCond ctx;
+  event_preprocessor.preprocess(&event_entry, &ctx);
+  ASSERT_EQ(-EINVAL, ctx.wait());
+}
+
+TEST_F(TestMockImageReplayerEventPreprocessor, PreprocessClientUpdateError) {
+  librbd::MockTestImageCtx mock_local_image_ctx(*m_local_image_ctx);
+  ::journal::MockJournaler mock_remote_journaler;
+
+  expect_image_refresh(mock_local_image_ctx, 0);
+  expect_update_client(mock_remote_journaler, -EINVAL);
+
+  mock_local_image_ctx.snap_ids = {{{cls::rbd::UserSnapshotNamespace(), "snap"}, 6}};
+  mock_local_image_ctx.snap_info = {
+    {6, librbd::SnapInfo{"snap", cls::rbd::UserSnapshotNamespace(), 0U, {}, 0U, 0U, utime_t()}}};
+  MockEventPreprocessor event_preprocessor(mock_local_image_ctx,
+                                           mock_remote_journaler,
+                                           "local mirror uuid",
+                                           &m_client_meta,
+                                           m_threads->work_queue);
+
+  librbd::journal::EventEntry event_entry{
+    librbd::journal::SnapRenameEvent{0, 5, "snap", "new_snap"}};
+  C_SaferCond ctx;
+  event_preprocessor.preprocess(&event_entry, &ctx);
+  ASSERT_EQ(-EINVAL, ctx.wait());
+}
+
+} // namespace image_replayer
+} // namespace mirror
+} // namespace rbd