diff --git a/storage/ndb/src/ndbapi/NdbEventOperationImpl.cpp b/storage/ndb/src/ndbapi/NdbEventOperationImpl.cpp
index fb2401bdd9e..b491e00ba65 100644
--- a/storage/ndb/src/ndbapi/NdbEventOperationImpl.cpp
+++ b/storage/ndb/src/ndbapi/NdbEventOperationImpl.cpp
@@ -1117,7 +1117,7 @@ NdbEventBuffer::nextEvent()
     m_available_data.remove_first();
 
     // add it to used list
-    m_used_data.append(data);
+    m_used_data.append_used_data(data);
 
 #ifdef VM_TRACE
     op->m_data_done_count++;
@@ -1144,6 +1144,10 @@ NdbEventBuffer::nextEvent()
           (void)tBlob->atNextEvent();
           tBlob = tBlob->theNext;
         }
+        EventBufData_list::Gci_ops *gci_ops = m_available_data.first_gci_ops();
+        while (gci_ops && op->getGCI() > gci_ops->m_gci)
+          gci_ops = m_available_data.next_gci_ops();
+        assert(gci_ops && (op->getGCI() == gci_ops->m_gci));
 	DBUG_RETURN_EVENT(op->m_facade);
       }
       // the next event belonged to an event op that is no
@@ -1158,15 +1162,21 @@ NdbEventBuffer::nextEvent()
 #ifdef VM_TRACE
   m_latest_command= m_latest_command_save;
 #endif
+
+  // free all "per gci unique" collected operations
+  EventBufData_list::Gci_ops *gci_ops = m_available_data.first_gci_ops();
+  while (gci_ops)
+    gci_ops = m_available_data.next_gci_ops();
   DBUG_RETURN_EVENT(0);
 }
 
 NdbEventOperationImpl*
 NdbEventBuffer::getGCIEventOperations(Uint32* iter, Uint32* event_types)
 {
-  if (*iter < m_available_data.m_gci_op_count)
+  EventBufData_list::Gci_ops *gci_ops = m_available_data.first_gci_ops();
+  if (*iter < gci_ops->m_gci_op_count)
   {
-    EventBufData_list::Gci_op g = m_available_data.m_gci_op_list[(*iter)++];
+    EventBufData_list::Gci_op g = gci_ops->m_gci_op_list[(*iter)++];
     if (event_types != NULL)
       *event_types = g.event_types;
     return g.op;
@@ -1318,7 +1328,7 @@ NdbEventBuffer::execSUB_GCP_COMPLETE_REP(const SubGcpCompleteRep * const rep)
 #ifdef VM_TRACE
 	assert(bucket->m_data.m_count);
 #endif
-	m_complete_data.m_data.append(bucket->m_data);
+	m_complete_data.m_data.append_list(&bucket->m_data, gci);
       }
       reportStatus();
       bzero(bucket, sizeof(Gci_container));
@@ -1389,7 +1399,7 @@ NdbEventBuffer::complete_outof_order_gcis()
 #ifdef VM_TRACE
       assert(bucket->m_data.m_count);
 #endif
-      m_complete_data.m_data.append(bucket->m_data);
+      m_complete_data.m_data.append_list(&bucket->m_data, start_gci);
 #ifdef VM_TRACE
       ndbout_c(" moved %lld rows -> %lld", bucket->m_data.m_count,
 	       m_complete_data.m_data.m_count);
@@ -1599,7 +1609,7 @@ NdbEventBuffer::insertDataL(NdbEventOperationImpl *op,
       data->m_event_op = op;
       if (! is_blob_event || ! is_data_event)
       {
-        bucket->m_data.append(data);
+        bucket->m_data.append_data(data);
       }
       else
       {
@@ -1615,7 +1625,7 @@ NdbEventBuffer::insertDataL(NdbEventOperationImpl *op,
         if (ret != 0) // main event was created
         {
           main_data->m_event_op = op->theMainOp;
-          bucket->m_data.append(main_data);
+          bucket->m_data.append_data(main_data);
           if (use_hash)
           {
             main_data->m_pkhash = main_hpos.pkhash;
@@ -2097,7 +2107,7 @@ NdbEventBuffer::move_data()
   if (!m_complete_data.m_data.is_empty())
   {
     // move this list to last in m_available_data
-    m_available_data.append(m_complete_data.m_data);
+    m_available_data.append_list(&m_complete_data.m_data, 0);
 
     bzero(&m_complete_data, sizeof(m_complete_data));
   }
@@ -2160,6 +2170,19 @@ NdbEventBuffer::free_list(EventBufData_list &list)
   list.m_count = list.m_sz = 0;
 }
 
+void EventBufData_list::append_list(EventBufData_list *list, Uint64 gci)
+{
+  move_gci_ops(list, gci);
+
+  if (m_tail)
+    m_tail->m_next= list->m_head;
+  else
+    m_head= list->m_head;
+  m_tail= list->m_tail;
+  m_count+= list->m_count;
+  m_sz+= list->m_sz;
+}
+
 void
 EventBufData_list::add_gci_op(Gci_op g)
 {
@@ -2188,6 +2211,44 @@ EventBufData_list::add_gci_op(Gci_op g)
   }
 }
 
+void
+EventBufData_list::move_gci_ops(EventBufData_list *list, Uint64 gci)
+{
+  assert(!m_is_not_multi_list);
+  if (!list->m_is_not_multi_list)
+  {
+    assert(gci == 0);
+    if (m_gci_ops_list_tail)
+      m_gci_ops_list_tail->m_next = list->m_gci_ops_list;
+    else
+    {
+      m_gci_ops_list =  list->m_gci_ops_list;
+    }
+    m_gci_ops_list_tail = list->m_gci_ops_list_tail;
+    goto end;
+  }
+  {
+    Gci_ops *new_gci_ops = new Gci_ops;
+    if (m_gci_ops_list_tail)
+      m_gci_ops_list_tail->m_next = new_gci_ops;
+    else
+    {
+      assert(m_gci_ops_list == 0);
+      m_gci_ops_list = new_gci_ops;
+    }
+    m_gci_ops_list_tail = new_gci_ops;
+    
+    new_gci_ops->m_gci_op_list = list->m_gci_op_list;
+    new_gci_ops->m_gci_op_count = list->m_gci_op_count;
+    new_gci_ops->m_gci = gci;
+    new_gci_ops->m_next = 0;
+  }
+end:
+  list->m_gci_op_list = 0;
+  list->m_gci_ops_list_tail = 0;
+  list->m_gci_op_alloc = 0;
+}
+
 NdbEventOperation*
 NdbEventBuffer::createEventOperation(const char* eventName,
 				     NdbError &theError)
diff --git a/storage/ndb/src/ndbapi/NdbEventOperationImpl.hpp b/storage/ndb/src/ndbapi/NdbEventOperationImpl.hpp
index 3e7d313fe02..9ce85a61361 100644
--- a/storage/ndb/src/ndbapi/NdbEventOperationImpl.hpp
+++ b/storage/ndb/src/ndbapi/NdbEventOperationImpl.hpp
@@ -68,8 +68,12 @@ public:
   ~EventBufData_list();
 
   void remove_first();
-  void append(EventBufData *data);
-  void append(const EventBufData_list &list);
+  // append data and insert data into Gci_op list with add_gci_op
+  void append_data(EventBufData *data);
+  // append data and insert data but ignore Gci_op list
+  void append_used_data(EventBufData *data);
+  // append list to another, will call move_gci_ops
+  void append_list(EventBufData_list *list, Uint64 gci);
 
   int is_empty();
 
@@ -77,13 +81,60 @@ public:
   unsigned m_count;
   unsigned m_sz;
 
-  // distinct ops per gci (assume no hash needed)
-  struct Gci_op { NdbEventOperationImpl* op; Uint32 event_types; };
-  Gci_op* m_gci_op_list;
-  Uint32 m_gci_op_count;
-  Uint32 m_gci_op_alloc;
+  /*
+    distinct ops per gci (assume no hash needed)
+
+    list may be in 2 versions
+
+    1. single list with on gci only
+    - one linear array
+    Gci_op  *m_gci_op_list;
+    Uint32 m_gci_op_count;
+    Uint32 m_gci_op_alloc != 0;
+
+    2. multi list with several gcis
+    - linked list of gci's
+    - one linear array per gci
+    Gci_ops *m_gci_ops_list;
+    Gci_ops *m_gci_ops_list_tail;
+    Uint32 m_is_not_multi_list == 0;
+
+  */
+  struct Gci_op                 // 1 + 2
+  {
+    NdbEventOperationImpl* op;
+    Uint32 event_types;
+  };
+  struct Gci_ops                // 2
+  {
+    Uint64 m_gci;
+    Gci_op *m_gci_op_list;
+    Gci_ops *m_next;
+    Uint32 m_gci_op_count;
+  };
+  union
+  {
+    Gci_op  *m_gci_op_list;      // 1
+    Gci_ops *m_gci_ops_list;     // 2
+  };
+  union
+  {
+    Uint32 m_gci_op_count;       // 1
+    Gci_ops *m_gci_ops_list_tail;// 2
+  };
+  union
+  {
+    Uint32 m_gci_op_alloc;       // 1
+    Uint32 m_is_not_multi_list;  // 2
+  };
+  Gci_ops *first_gci_ops();
+  Gci_ops *next_gci_ops();
 private:
+  // case 1 above; add Gci_op to single list
   void add_gci_op(Gci_op g);
+  // case 2 above; move single list or multi list from
+  // one list to another
+  void move_gci_ops(EventBufData_list *list, Uint64 gci);
 };
 
 inline
@@ -92,7 +143,7 @@ EventBufData_list::EventBufData_list()
     m_count(0),
     m_sz(0),
     m_gci_op_list(NULL),
-    m_gci_op_count(0),
+    m_gci_ops_list_tail(0),
     m_gci_op_alloc(0)
 {
 }
@@ -100,7 +151,14 @@ EventBufData_list::EventBufData_list()
 inline
 EventBufData_list::~EventBufData_list()
 {
-  delete [] m_gci_op_list;
+  if (m_is_not_multi_list)
+    delete [] m_gci_op_list;
+  else
+  {
+    Gci_ops *op = first_gci_ops();
+    while (op)
+      op = next_gci_ops();
+  }
 }
 
 inline
@@ -120,11 +178,8 @@ void EventBufData_list::remove_first()
 }
 
 inline
-void EventBufData_list::append(EventBufData *data)
+void EventBufData_list::append_used_data(EventBufData *data)
 {
-  Gci_op g = { data->m_event_op, 1 << (Uint32)data->sdata->operation };
-  add_gci_op(g);
-
   data->m_next= 0;
   if (m_tail)
     m_tail->m_next= data;
@@ -143,19 +198,33 @@ void EventBufData_list::append(EventBufData *data)
 }
 
 inline
-void EventBufData_list::append(const EventBufData_list &list)
+void EventBufData_list::append_data(EventBufData *data)
 {
-  Uint32 i;
-  for (i = 0; i < list.m_gci_op_count; i++)
-    add_gci_op(list.m_gci_op_list[i]);
+  Gci_op g = { data->m_event_op, 1 << (Uint32)data->sdata->operation };
+  add_gci_op(g);
 
-  if (m_tail)
-    m_tail->m_next= list.m_head;
-  else
-    m_head= list.m_head;
-  m_tail= list.m_tail;
-  m_count+= list.m_count;
-  m_sz+= list.m_sz;
+  append_used_data(data);
+}
+
+inline EventBufData_list::Gci_ops *
+EventBufData_list::first_gci_ops()
+{
+  assert(!m_is_not_multi_list);
+  return m_gci_ops_list;
+}
+
+inline EventBufData_list::Gci_ops *
+EventBufData_list::next_gci_ops()
+{
+  assert(!m_is_not_multi_list);
+  Gci_ops *first = m_gci_ops_list;
+  m_gci_ops_list = first->m_next;
+  if (first->m_gci_op_list)
+    delete [] first->m_gci_op_list;
+  delete first;
+  if (m_gci_ops_list == 0)
+    m_gci_ops_list_tail = 0;
+  return m_gci_ops_list;
 }
 
 // GCI bucket has also a hash over data, with key event op, table PK.