BUG#12124 ndb_mgm -e "# stop" does not allow stopping ndb_mgmd processes on other systems

WL#2703 restart for ndb_mgmd

Solving two problems with one stone.

Allows the stopping and restarting of mgm nodes other than the one the mgmclient
is connected to.


ndb/include/mgmapi/mgmapi.h:
  Add the internal ndb_mgm_end_session command.
  
  This will unreserve the nodeid we have allocated synchronously.
  
  Otherwise we can't do a restart of a node really quickly as the nodeids are cleaned
  up after the connection to mgmd is closed.
ndb/include/mgmcommon/ConfigRetriever.hpp:
  Allow configuration on if end_session is going to be called on object destruction.
  
  We need to set this to false for ndbd as we fork()
ndb/src/common/mgmcommon/ConfigRetriever.cpp:
  When destroying ConfigRetreiver, ndb_mgm_end_session - i.e. deallocate the nodeid
ndb/src/common/util/SocketServer.cpp:
  When destroying a SocketServer, close the server socket.
ndb/src/kernel/main.cpp:
  don't purge allocated resources when cleaning up in parent process (nodeid)
ndb/src/kernel/vm/Configuration.cpp:
  have option end_session to closeConfiguration
ndb/src/kernel/vm/Configuration.hpp:
  have option end_session to closeConfiguration
ndb/src/mgmapi/mgmapi.cpp:
  Implement ndb_mgm_end_session
ndb/src/mgmclient/CommandInterpreter.cpp:
  Correct output of STOP as we can now stop mgmd as well as ndbd
ndb/src/mgmsrv/MgmtSrvr.cpp:
  Add code into start for connecting to our own mgmd.
  
  Create sendStopMgmd() which does the same job as sendSTOP_REQ, but for ndb_mgmd
  
  Allow stopping of other ndb_mgmd processes by creating a connection to them
  and issuing the stop command
  
  When stopping all nodes, stop other ndb_mgmd processes as well.
  
  Remove set_connect_string. Replace with connect_to_self. This is a much better
  way of doing things.
ndb/src/mgmsrv/MgmtSrvr.hpp:
  add connect_to_self and remove set_connect_string.
ndb/src/mgmsrv/Services.cpp:
  Add endSession.
  
  - delete Allocated_resources for this connection
  - create new Allocated_resources for this connection
  
  conceivably you could keep the socket open across node restarts (and even
  possibly get a different node id). But I wouldn't try it and expect happiness.
ndb/src/mgmsrv/Services.hpp:
  Add endSession
ndb/src/mgmsrv/main.cpp:
  allow mgmd to be restarted.
  
  - add g_RestartServer flag
  - move connecting to our own mgmd into MgmtSrvr (where it belongs)
  - output correct Shutdown/Restart message on shutdown/restart

ndb/include/mgmapi/mgmapi.h

@@ -993,6 +993,22 @@ extern "C" {
   int ndb_mgm_alloc_nodeid(NdbMgmHandle handle,
 			   unsigned version, int nodetype);
 
+  /**
+   * End Session
+   *
+   * This function tells the mgm server to free all resources associated with
+   * this connection. It will also close it.
+   *
+   * This differs from just disconnecting as we now synchronously clean up,
+   * so that a quickly restarting server that needs the same node id can
+   * get it when it restarts.
+   *
+   * @param  handle NDB management handle
+   * @return 0 on success
+   *
+   * @note you still have to destroy the NdbMgmHandle.
+   */
+  int ndb_mgm_end_session(NdbMgmHandle handle);
 
   /**
    * Get the node id of the mgm server we're connected to

ndb/include/mgmcommon/ConfigRetriever.hpp

@@ -78,6 +78,7 @@ public:
   const char *get_connectstring(char *buf, int buf_sz) const;
   NdbMgmHandle get_mgmHandle() { return m_handle; };
   NdbMgmHandle* get_mgmHandlePtr() { return &m_handle; };
+  void end_session(bool end) { m_end_session= end; };
 
   Uint32 get_configuration_nodeid() const;
 private:
@@ -92,6 +93,8 @@ private:
   void setError(ErrorType, const char * errorMsg);
   
   Uint32      _ownNodeId;
+  bool m_end_session;
+
   /*
   Uint32      m_mgmd_port;
   const char *m_mgmd_host;

ndb/src/common/mgmcommon/ConfigRetriever.cpp

@@ -52,6 +52,7 @@ ConfigRetriever::ConfigRetriever(const char * _connect_string,
   m_version = version;
   m_node_type = node_type;
   _ownNodeId= 0;
+  m_end_session= true;
 
   m_handle= ndb_mgm_create_handle();
 
@@ -73,6 +74,8 @@ ConfigRetriever::~ConfigRetriever()
 {
   DBUG_ENTER("ConfigRetriever::~ConfigRetriever");
   if (m_handle) {
+    if(m_end_session)
+      ndb_mgm_end_session(m_handle);
     ndb_mgm_disconnect(m_handle);
     ndb_mgm_destroy_handle(&m_handle);
   }

ndb/src/common/util/SocketServer.cpp

@@ -42,6 +42,8 @@ SocketServer::~SocketServer() {
     delete m_sessions[i].m_session;
   }
   for(i = 0; i<m_services.size(); i++){
+    if(m_services[i].m_socket)
+      NDB_CLOSE_SOCKET(m_services[i].m_socket);
     delete m_services[i].m_service;
   }
 }

ndb/src/kernel/main.cpp

@@ -307,8 +307,11 @@ int main(int argc, char** argv)
     /**
      * We no longer need the mgm connection in this process
      * (as we are the angel, not ndb)
+     *
+     * We don't want to purge any allocated resources (nodeid), so
+     * we set that option to false
      */
-    theConfig->closeConfiguration();
+    theConfig->closeConfiguration(false);
 
     int status = 0, error_exit = 0, signum = 0;
     while(waitpid(child, &status, 0) != child);

ndb/src/kernel/vm/Configuration.cpp

@@ -172,7 +172,8 @@ Configuration::~Configuration(){
 }
 
 void
-Configuration::closeConfiguration(){
+Configuration::closeConfiguration(bool end_session){
+  m_config_retriever->end_session(end_session);
   if (m_config_retriever) {
     delete m_config_retriever;
   }

ndb/src/kernel/vm/Configuration.hpp

@@ -35,7 +35,7 @@ public:
 
   void fetch_configuration();
   void setupConfiguration();
-  void closeConfiguration();
+  void closeConfiguration(bool end_session= true);
   
   bool lockPagesInMainMemory() const;
   

ndb/src/mgmapi/mgmapi.cpp

@@ -2321,4 +2321,23 @@ int ndb_mgm_report_event(NdbMgmHandle handle, Uint32 *data, Uint32 length)
   DBUG_RETURN(0);
 }
 
+extern "C"
+int ndb_mgm_end_session(NdbMgmHandle handle)
+{
+  DBUG_ENTER("ndb_mgm_end_session");
+  CHECK_HANDLE(handle, 0);
+  CHECK_CONNECTED(handle, 0);
+
+  SocketOutputStream s_output(handle->socket);
+  s_output.println("end session");
+  s_output.println("");
+
+  SocketInputStream in(handle->socket, handle->read_timeout);
+  char buf[32];
+
+  in.gets(buf, sizeof(buf));
+
+  DBUG_RETURN(0);
+}
+
 template class Vector<const ParserRow<ParserDummy>*>;

ndb/src/mgmclient/CommandInterpreter.cpp

@@ -1000,27 +1000,22 @@ CommandInterpreter::executeShutdown(char* parameters)
   int result = 0;
   result = ndb_mgm_stop(m_mgmsrv, 0, 0);
   if (result < 0) {
-    ndbout << "Shutdown off NDB Cluster storage node(s) failed." << endl;
+    ndbout << "Shutdown of NDB Cluster node(s) failed." << endl;
     printError();
     return result;
   }
 
-  ndbout << result << " NDB Cluster storage node(s) have shutdown." << endl;
+  ndbout << result << " NDB Cluster node(s) have shutdown." << endl;
 
   int mgm_id= 0;
-  for(int i=0; i < state->no_of_nodes; i++) {
-    if(state->node_states[i].node_type == NDB_MGM_NODE_TYPE_MGM &&
-       state->node_states[i].version != 0){
+  mgm_id= ndb_mgm_get_mgmd_nodeid(m_mgmsrv);
   if (mgm_id == 0)
-	mgm_id= state->node_states[i].node_id;
-      else {
+  {
     ndbout << "Unable to locate management server, "
            << "shutdown manually with <id> STOP"
            << endl;
     return 1;
   }
-    }
-  }
 
   result = ndb_mgm_stop(m_mgmsrv, 1, &mgm_id);
   if (result <= 0) {

ndb/src/mgmsrv/MgmtSrvr.cpp

@@ -60,6 +60,9 @@
 
 #include <SignalSender.hpp>
 
+extern bool g_StopServer;
+extern bool g_RestartServer;
+
 //#define MGM_SRV_DEBUG
 #ifdef MGM_SRV_DEBUG
 #define DEBUG(x) do ndbout << x << endl; while(0)
@@ -373,7 +376,8 @@ MgmtSrvr::MgmtSrvr(SocketServer *socket_server,
   _ownReference(0),
   theSignalIdleList(NULL),
   theWaitState(WAIT_SUBSCRIBE_CONF),
-  m_event_listner(this)
+  m_event_listner(this),
+  m_local_mgm_handle(0)
 {
     
   DBUG_ENTER("MgmtSrvr::MgmtSrvr");
@@ -541,6 +545,8 @@ MgmtSrvr::check_start()
 bool 
 MgmtSrvr::start(BaseString &error_string)
 {
+  int mgm_connect_result;
+
   DBUG_ENTER("MgmtSrvr::start");
   if (_props == NULL) {
     if (!check_start()) {
@@ -578,6 +584,13 @@ MgmtSrvr::start(BaseString &error_string)
     DBUG_RETURN(false);
   }
 
+  if((mgm_connect_result= connect_to_self()) < 0)
+  {
+    ndbout_c("Unable to connect to our own ndb_mgmd (Error %d)",
+             mgm_connect_result);
+    ndbout_c("This is probably a bug.");
+  }
+
   TransporterRegistry *reg = theFacade->get_registry();
   for(unsigned int i=0;i<reg->m_transporter_interface.size();i++) {
     BaseString msg;
@@ -835,9 +848,81 @@ MgmtSrvr::sendVersionReq(int v_nodeId, Uint32 &version, const char **address)
   return 0;
 }
 
+int MgmtSrvr::sendStopMgmd(NodeId nodeId,
+			   bool abort,
+			   bool stop,
+			   bool restart,
+			   bool nostart,
+			   bool initialStart)
+{
+  const char* hostname;
+  Uint32 port;
+  BaseString connect_string;
+
+  {
+    Guard g(m_configMutex);
+    {
+      ndb_mgm_configuration_iterator
+        iter(* _config->m_configValues, CFG_SECTION_NODE);
+
+      if(iter.first())                       return SEND_OR_RECEIVE_FAILED;
+      if(iter.find(CFG_NODE_ID, nodeId))     return SEND_OR_RECEIVE_FAILED;
+      if(iter.get(CFG_NODE_HOST, &hostname)) return SEND_OR_RECEIVE_FAILED;
+    }
+    {
+      ndb_mgm_configuration_iterator
+        iter(* _config->m_configValues, CFG_SECTION_NODE);
+
+      if(iter.first())                   return SEND_OR_RECEIVE_FAILED;
+      if(iter.find(CFG_NODE_ID, nodeId)) return SEND_OR_RECEIVE_FAILED;
+      if(iter.get(CFG_MGM_PORT, &port))  return SEND_OR_RECEIVE_FAILED;
+    }
+    if( strlen(hostname) == 0 )
+      return SEND_OR_RECEIVE_FAILED;
+  }
+  connect_string.assfmt("%s:%u",hostname,port);
+
+  DBUG_PRINT("info",("connect string: %s",connect_string.c_str()));
+
+  NdbMgmHandle h= ndb_mgm_create_handle();
+  if ( h && connect_string.length() > 0 )
+  {
+    ndb_mgm_set_connectstring(h,connect_string.c_str());
+    if(ndb_mgm_connect(h,1,0,0))
+    {
+      DBUG_PRINT("info",("failed ndb_mgm_connect"));
+      return SEND_OR_RECEIVE_FAILED;
+    }
+    if(!restart)
+    {
+      if(ndb_mgm_stop(h, 1, (const int*)&nodeId) < 0)
+      {
+        return SEND_OR_RECEIVE_FAILED;
+      }
+    }
+    else
+    {
+      int nodes[1];
+      nodes[0]= (int)nodeId;
+      if(ndb_mgm_restart2(h, 1, nodes, initialStart, nostart, abort) < 0)
+      {
+        return SEND_OR_RECEIVE_FAILED;
+      }
+    }
+  }
+  ndb_mgm_destroy_handle(&h);
+
+  return 0;
+}
+
 /*
  * Common method for handeling all STOP_REQ signalling that
  * is used by Stopping, Restarting and Single user commands
+ *
+ * In the event that we need to stop a mgmd, we create a mgm
+ * client connection to that mgmd and stop it that way.
+ * This allows us to stop mgm servers when there isn't any real
+ * distributed communication up.
  */
 
 int MgmtSrvr::sendSTOP_REQ(NodeId nodeId,
@@ -849,6 +934,8 @@ int MgmtSrvr::sendSTOP_REQ(NodeId nodeId,
 			   bool nostart,
 			   bool initialStart)
 {
+  int error = 0;
+
   stoppedNodes.clear();
 
   SignalSender ss(theFacade);
@@ -887,18 +974,34 @@ int MgmtSrvr::sendSTOP_REQ(NodeId nodeId,
   NodeBitmask nodes;
   if (nodeId)
   {
+    if(nodeId==getOwnNodeId())
+    {
+      if(restart)
+        g_RestartServer= true;
+      g_StopServer= true;
+      return 0;
+    }
+    if(getNodeType(nodeId) == NDB_MGM_NODE_TYPE_NDB)
     {
       int r;
       if((r= okToSendTo(nodeId, true)) != 0)
         return r;
-    }
-    {
       if (ss.sendSignal(nodeId, &ssig) != SEND_OK)
 	return SEND_OR_RECEIVE_FAILED;
     }
+    else if(getNodeType(nodeId) == NDB_MGM_NODE_TYPE_MGM)
+    {
+      error= sendStopMgmd(nodeId, abort, stop, restart, nostart, initialStart);
+      if(error==0)
+        stoppedNodes.set(nodeId);
+      return error;
+    }
+    else
+      return WRONG_PROCESS_TYPE;
     nodes.set(nodeId);
   }
   else
+  {
     while(getNextNodeId(&nodeId, NDB_MGM_NODE_TYPE_NDB))
     {
       if(okToSendTo(nodeId, true) == 0)
@@ -908,9 +1011,17 @@ int MgmtSrvr::sendSTOP_REQ(NodeId nodeId,
 	  nodes.set(nodeId);
       }
     }
+    nodeId= 0;
+    while(getNextNodeId(&nodeId, NDB_MGM_NODE_TYPE_MGM))
+    {
+      if(nodeId==getOwnNodeId())
+        continue;
+      if(sendStopMgmd(nodeId, abort, stop, restart, nostart, initialStart)==0)
+        stoppedNodes.set(nodeId);
+    }
+  }
 
   // now wait for the replies
-  int error = 0;
   while (!nodes.isclear())
   {
     SimpleSignal *signal = ss.waitFor();
@@ -2446,9 +2557,23 @@ void MgmtSrvr::transporter_connect(NDB_SOCKET_TYPE sockfd)
   }
 }
 
-int MgmtSrvr::set_connect_string(const char *str)
+int MgmtSrvr::connect_to_self(void)
 {
-  return ndb_mgm_set_connectstring(m_config_retriever->get_mgmHandle(),str);
+  int r= 0;
+  m_local_mgm_handle= ndb_mgm_create_handle();
+  snprintf(m_local_mgm_connect_string,sizeof(m_local_mgm_connect_string),
+           "localhost:%u",getPort());
+  ndb_mgm_set_connectstring(m_local_mgm_handle, m_local_mgm_connect_string);
+
+  if((r= ndb_mgm_connect(m_local_mgm_handle, 0, 0, 0)) < 0)
+  {
+    ndb_mgm_destroy_handle(&m_local_mgm_handle);
+    return r;
+  }
+  // TransporterRegistry now owns this NdbMgmHandle and will destroy it.
+  theFacade->get_registry()->set_mgm_handle(m_local_mgm_handle);
+
+  return 0;
 }
 
 

ndb/src/mgmsrv/MgmtSrvr.hpp

@@ -471,7 +471,7 @@ public:
   int getConnectionDbParameter(int node1, int node2, int param,
 			       int *value, BaseString& msg);
 
-  int set_connect_string(const char *str);
+  int connect_to_self(void);
 
   void transporter_connect(NDB_SOCKET_TYPE sockfd);
 
@@ -487,6 +487,13 @@ private:
 
   int send(SignalSender &ss, SimpleSignal &ssig, Uint32 node, Uint32 node_type);
 
+  int sendStopMgmd(NodeId nodeId,
+                   bool abort,
+                   bool stop,
+                   bool restart,
+                   bool nostart,
+                   bool initialStart);
+
   int sendSTOP_REQ(NodeId nodeId,
 		   NodeBitmask &stoppedNodes,
 		   Uint32 singleUserNodeId,
@@ -629,6 +636,8 @@ private:
   // signal arrives.
   // We wait in receiveOptimisedResponse and signal in handleReceivedSignal.
 
+  NdbMgmHandle m_local_mgm_handle;
+  char m_local_mgm_connect_string[20];
   class TransporterFacade * theFacade;
 
   int  sendVersionReq( int processId, Uint32 &version, const char **address);

ndb/src/mgmsrv/Services.cpp

@@ -203,6 +203,8 @@ ParserRow<MgmApiSession> commands[] = {
 
   MGM_CMD("bye", &MgmApiSession::bye, ""),
 
+  MGM_CMD("end session", &MgmApiSession::endSession, ""),
+
   MGM_CMD("set loglevel", &MgmApiSession::setLogLevel, ""),
     MGM_ARG("node", Int, Mandatory, "Node"),
     MGM_ARG("category", Int, Mandatory, "Event category"),
@@ -723,6 +725,17 @@ MgmApiSession::bye(Parser<MgmApiSession>::Context &,
   m_stop = true;
 }
 
+void
+MgmApiSession::endSession(Parser<MgmApiSession>::Context &,
+                          Properties const &) {
+  if(m_allocated_resources)
+    delete m_allocated_resources;
+
+  m_allocated_resources= new MgmtSrvr::Allocated_resources(m_mgmsrv);
+
+  m_output->println("end session reply");
+}
+
 void
 MgmApiSession::setClusterLogLevel(Parser<MgmApiSession>::Context &,
 				  Properties const &args) {

ndb/src/mgmsrv/Services.hpp

@@ -79,6 +79,7 @@ public:
   void start(Parser_t::Context &ctx, const class Properties &args);
   void startAll(Parser_t::Context &ctx, const class Properties &args);
   void bye(Parser_t::Context &ctx, const class Properties &args);
+  void endSession(Parser_t::Context &ctx, const class Properties &args);
   void setLogLevel(Parser_t::Context &ctx, const class Properties &args);
   void setClusterLogLevel(Parser_t::Context &ctx, 
 			  const class Properties &args);

ndb/src/mgmsrv/main.cpp

@@ -132,6 +132,7 @@ static MgmGlobals *glob= 0;
  * Global variables
  */
 bool g_StopServer;
+bool g_RestartServer;
 extern EventLogger g_eventLogger;
 
 extern int global_mgmt_server_check;
@@ -191,7 +192,19 @@ static void usage()
  */
 int main(int argc, char** argv)
 {
+  int mgm_connect_result;
+
   NDB_INIT(argv[0]);
+
+  int ho_error;
+#ifndef DBUG_OFF
+  opt_debug= "d:t:O,/tmp/ndb_mgmd.trace";
+#endif
+  if ((ho_error=handle_options(&argc, &argv, my_long_options, 
+			       ndb_std_get_one_option)))
+    exit(ho_error);
+
+start:
   glob= new MgmGlobals;
 
   /**
@@ -208,14 +221,6 @@ int main(int argc, char** argv)
   const char *load_default_groups[]= { "mysql_cluster","ndb_mgmd",0 };
   load_defaults("my",load_default_groups,&argc,&argv);
 
-  int ho_error;
-#ifndef DBUG_OFF
-  opt_debug= "d:t:O,/tmp/ndb_mgmd.trace";
-#endif
-  if ((ho_error=handle_options(&argc, &argv, my_long_options, 
-			       ndb_std_get_one_option)))
-    exit(ho_error);
-
   if (opt_interactive ||
       opt_non_interactive ||
       g_print_full_config) {
@@ -293,34 +298,12 @@ int main(int argc, char** argv)
     goto error_end;
   }
 
-  /* Construct a fake connectstring to connect back to ourselves */
-  char connect_str[20];
-  if(!opt_connect_str) {
-    snprintf(connect_str,20,"localhost:%u",glob->mgmObject->getPort());
-    opt_connect_str= connect_str;
-  }
-  glob->mgmObject->set_connect_string(opt_connect_str);
-
   if(!glob->mgmObject->check_start()){
     ndbout_c("Unable to check start management server.");
     ndbout_c("Probably caused by illegal initial configuration file.");
     goto error_end;
   }
 
-  /* 
-   * Connect back to ourselves so we can use mgmapi to fetch
-   * config info
-   */
-  int mgm_connect_result;
-  mgm_connect_result = glob->mgmObject->get_config_retriever()->
-    do_connect(0,0,0);
-
-  if(mgm_connect_result<0) {
-    ndbout_c("Unable to connect to our own ndb_mgmd (Error %d)",
-	     mgm_connect_result);
-    ndbout_c("This is probably a bug.");
-  }
-  
   if (opt_daemon) {
     // Become a daemon
     char *lockfile= NdbConfig_PidFileName(glob->localNodeId);
@@ -361,6 +344,7 @@ int main(int argc, char** argv)
   g_eventLogger.info(msg);
   
   g_StopServer = false;
+  g_RestartServer= false;
   glob->socketServer->startServer();
 
 #if ! defined NDB_OSE && ! defined NDB_SOFTOSE
@@ -379,13 +363,18 @@ int main(int argc, char** argv)
       NdbSleep_MilliSleep(500);
   }
 
+  if(g_RestartServer)
+    g_eventLogger.info("Restarting server...");
+  else
     g_eventLogger.info("Shutting down server...");
   glob->socketServer->stopServer();
-  glob->mgmObject->get_config_retriever()->disconnect();
+  // We disconnect from the ConfigRetreiver mgmd when we delete glob below
   glob->socketServer->stopSessions(true);
   g_eventLogger.info("Shutdown complete");
  the_end:
   delete glob;
+  if(g_RestartServer)
+    goto start;
   ndb_end(opt_endinfo ? MY_CHECK_ERROR | MY_GIVE_INFO : 0);
   return 0;
  error_end: