added management function to purge stale sessions in the management server

ndb/include/util/Bitmask.hpp:
  added bitXORC
ndb/include/util/SocketServer.hpp:
  added method to apply function on each session
ndb/src/common/util/SocketServer.cpp:
  added method to apply function on each session

ndb/include/mgmapi/mgmapi.h

@@ -733,6 +733,7 @@ extern "C" {
 				  int param, unsigned long long * value);
   int ndb_mgm_get_string_parameter(const ndb_mgm_configuration_iterator*,
 				   int param, const char  ** value);
+  int ndb_mgm_purge_stale_sessions(NdbMgmHandle handle, char **);
 #ifdef __cplusplus
 }
 #endif

ndb/include/util/Bitmask.hpp

@@ -104,6 +104,11 @@ public:
    */
   static void bitXOR(unsigned size, Uint32 data[], const Uint32 data2[]);
 
+  /**
+   * bitXORC - Bitwise (x ^ ~y) into first operand.
+   */
+  static void bitXORC(unsigned size, Uint32 data[], const Uint32 data2[]);
+
   /**
    * contains - Check if all bits set in data2 are set in data
    */
@@ -261,6 +266,14 @@ BitmaskImpl::bitXOR(unsigned size, Uint32 data[], const Uint32 data2[])
   }
 }
 
+inline void
+BitmaskImpl::bitXORC(unsigned size, Uint32 data[], const Uint32 data2[])
+{
+  for (unsigned i = 0; i < size; i++) {
+    data[i] ^= ~data2[i];
+  }
+}
+
 inline bool
 BitmaskImpl::contains(unsigned size, Uint32 data[], const Uint32 data2[])
 {
@@ -451,6 +464,12 @@ public:
   static void bitXOR(Uint32 data[], const Uint32 data2[]);
   BitmaskPOD<size>& bitXOR(const BitmaskPOD<size>& mask2);
 
+  /**
+   * bitXORC - Bitwise (x ^ ~y) into first operand.
+   */
+  static void bitXORC(Uint32 data[], const Uint32 data2[]);
+  BitmaskPOD<size>& bitXORC(const BitmaskPOD<size>& mask2);
+
   /**
    * contains - Check if all bits set in data2 (that) are also set in data (this)
    */
@@ -712,6 +731,21 @@ BitmaskPOD<size>::bitXOR(const BitmaskPOD<size>& mask2)
   return *this;
 }
 
+template <unsigned size>
+inline void
+BitmaskPOD<size>::bitXORC(Uint32 data[], const Uint32 data2[])
+{
+  BitmaskImpl::bitXORC(size,data, data2);
+}
+
+template <unsigned size>
+inline BitmaskPOD<size>&
+BitmaskPOD<size>::bitXORC(const BitmaskPOD<size>& mask2)
+{
+  BitmaskPOD<size>::bitXORC(rep.data, mask2.rep.data);
+  return *this;
+}
+
 template <unsigned size>
 char *
 BitmaskPOD<size>::getText(const Uint32 data[], char* buf)

ndb/include/util/SocketServer.hpp

@@ -37,7 +37,7 @@ public:
   public:
     virtual ~Session() {}
     virtual void runSession(){}
-    virtual void stopSession(){}
+    virtual void stopSession(){ m_stop = true; }
   protected:
     friend class SocketServer;
     friend void* sessionThread_C(void*);
@@ -98,6 +98,8 @@ public:
    */
   void stopSessions(bool wait = false);
   
+  void foreachSession(void (*f)(SocketServer::Session*, void*), void *data);
+
 private:
   struct SessionInstance {
     Service * m_service;

ndb/src/common/util/SocketServer.cpp

@@ -258,6 +258,15 @@ transfer(NDB_SOCKET_TYPE sock){
   return true;
 }
 
+void
+SocketServer::foreachSession(void (*func)(SocketServer::Session*, void *), void *data)
+{
+  for(int i = m_sessions.size() - 1; i >= 0; i--){
+    (*func)(m_sessions[i].m_session, data);
+  }
+  checkSessions();
+}
+
 void
 SocketServer::checkSessions(){
   for(int i = m_sessions.size() - 1; i >= 0; i--){
@@ -278,8 +287,10 @@ void
 SocketServer::stopSessions(bool wait){
   int i;
   for(i = m_sessions.size() - 1; i>=0; i--)
-    m_sessions[i].m_session->m_stop = true;
+  {
-  
+    m_sessions[i].m_session->stopSession();
+    m_sessions[i].m_session->m_stop = true; // to make sure
+  }
   for(i = m_services.size() - 1; i>=0; i--)
     m_services[i].m_service->stopSessions();
   

ndb/src/mgmapi/mgmapi.cpp

@@ -1834,4 +1834,46 @@ ndb_mgm_set_string_parameter(NdbMgmHandle handle,
   return res;
 }
 
+extern "C"
+int
+ndb_mgm_purge_stale_sessions(NdbMgmHandle handle, char **purged){
+  CHECK_HANDLE(handle, 0);
+  CHECK_CONNECTED(handle, 0);
+  
+  Properties args;
+  
+  const ParserRow<ParserDummy> reply[]= {
+    MGM_CMD("purge stale sessions reply", NULL, ""),
+    MGM_ARG("purged", String, Optional, ""),
+    MGM_ARG("result", String, Mandatory, "Error message"),
+    MGM_END()
+  };
+  
+  const Properties *prop;
+  prop= ndb_mgm_call(handle, reply, "purge stale sessions", &args);
+  
+  if(prop == NULL) {
+    SET_ERROR(handle, EIO, "Unable to purge stale sessions");
+    return -1;
+  }
+
+  int res= -1;
+  do {
+    const char * buf;
+    if(!prop->get("result", &buf) || strcmp(buf, "Ok") != 0){
+      ndbout_c("ERROR Message: %s\n", buf);
+      break;
+    }
+    if (purged) {
+      if (prop->get("purged", &buf))
+	*purged= strdup(buf);
+      else
+	*purged= 0;
+    }
+    res= 0;
+  } while(0);
+  delete prop;
+  return res;
+}
+
 template class Vector<const ParserRow<ParserDummy>*>;

ndb/src/mgmclient/CommandInterpreter.cpp

@@ -106,6 +106,7 @@ private:
    */
   void executeHelp(char* parameters);
   void executeShow(char* parameters);
+  void executePurge(char* parameters);
   void executeShutdown(char* parameters);
   void executeRun(char* parameters);
   void executeInfo(char* parameters);
@@ -264,6 +265,7 @@ static const char* helpText =
 #ifdef HAVE_GLOBAL_REPLICATION
 "REP CONNECT <host:port>                Connect to REP server on host:port\n"
 #endif
+"PURGE STALE SESSIONS                   Reset reserved nodeid's in the mgmt server\n"
 "QUIT                                   Quit management client\n"
 ;
 
@@ -541,6 +543,10 @@ CommandInterpreter::execute(const char *_line, int _try_reconnect)
     executeAbortBackup(allAfterFirstToken);
     return true;
   }
+  else if (strcmp(firstToken, "PURGE") == 0) {
+    executePurge(allAfterFirstToken);
+    return true;
+  } 
 #ifdef HAVE_GLOBAL_REPLICATION
   else if(strcmp(firstToken, "REPLICATION") == 0 ||
 	  strcmp(firstToken, "REP") == 0) {
@@ -982,6 +988,46 @@ print_nodes(ndb_mgm_cluster_state *state, ndb_mgm_configuration_iterator *it,
   ndbout << endl;
 }
 
+void
+CommandInterpreter::executePurge(char* parameters) 
+{ 
+  int command_ok= 0;
+  do {
+    if (emptyString(parameters))
+      break;
+    char* firstToken = strtok(parameters, " ");
+    char* nextToken = strtok(NULL, " \0");
+    if (strcmp(firstToken,"STALE") == 0 &&
+	nextToken &&
+	strcmp(nextToken, "SESSIONS") == 0) {
+      command_ok= 1;
+      break;
+    }
+  } while(0);
+
+  if (!command_ok) {
+    ndbout_c("Unexpected command, expected: PURGE STALE SESSIONS");
+    return;
+  }
+
+  int i;
+  char *str;
+  connect();
+  
+  if (ndb_mgm_purge_stale_sessions(m_mgmsrv, &str)) {
+    ndbout_c("Command failed");
+    return;
+  }
+  if (str) {
+    ndbout_c("Purged sessions with node id's: %s", str);
+    free(str);
+  }
+  else
+  {
+    ndbout_c("No sessions purged");
+  }
+}
+
 void
 CommandInterpreter::executeShow(char* parameters) 
 { 

ndb/src/mgmsrv/MgmtSrvr.cpp

@@ -400,11 +400,13 @@ MgmtSrvr::getPort() const {
 
 /* Constructor */
 MgmtSrvr::MgmtSrvr(NodeId nodeId,
+		   SocketServer *socket_server,
 		   const BaseString &configFilename,
 		   LocalConfig &local_config,
 		   Config * config):
   _blockNumber(1), // Hard coded block number since it makes it easy to send
                    // signals to other management servers.
+  m_socket_server(socket_server),
   _ownReference(0),
   m_local_config(local_config),
   theSignalIdleList(NULL),
@@ -2094,6 +2096,25 @@ MgmtSrvr::getNodeType(NodeId nodeId) const
   return nodeTypes[nodeId];
 }
 
+void
+MgmtSrvr::get_connected_nodes(NodeBitmask &connected_nodes) const
+{
+  if (theFacade && theFacade->theClusterMgr) 
+  {
+    for(Uint32 i = 0; i < MAX_NODES; i++)
+    {
+      if (getNodeType(i) == NDB_MGM_NODE_TYPE_NDB)
+      {
+	const ClusterMgr::Node &node= theFacade->theClusterMgr->getNodeInfo(i);
+	if (node.connected)
+	{
+	  connected_nodes.bitOR(node.m_state.m_connected_nodes);
+	}
+      }
+    }
+  }
+}
+
 bool
 MgmtSrvr::alloc_node_id(NodeId * nodeId, 
 			enum ndb_mgm_node_type type,
@@ -2106,7 +2127,7 @@ MgmtSrvr::alloc_node_id(NodeId * nodeId,
 		       *nodeId, type, client_addr));
   if (g_no_nodeid_checks) {
     if (*nodeId == 0) {
-      error_string.appfmt("no-nodeid-ckecks set in manegment server.\n"
+      error_string.appfmt("no-nodeid-checks set in management server.\n"
 			  "node id must be set explicitly in connectstring");
       DBUG_RETURN(false);
     }
@@ -2115,16 +2136,11 @@ MgmtSrvr::alloc_node_id(NodeId * nodeId,
   Guard g(m_node_id_mutex);
   int no_mgm= 0;
   NodeBitmask connected_nodes(m_reserved_nodes);
-  for(Uint32 i = 0; i < MAX_NODES; i++)
+  get_connected_nodes(connected_nodes);
   {
-    if (getNodeType(i) == NDB_MGM_NODE_TYPE_NDB &&
+    for(Uint32 i = 0; i < MAX_NODES; i++)
-	theFacade && theFacade->theClusterMgr) {
+      if (getNodeType(i) == NDB_MGM_NODE_TYPE_MGM)
-      const ClusterMgr::Node &node= theFacade->theClusterMgr->getNodeInfo(i);
+	no_mgm++;
-      if (node.connected) {
-	connected_nodes.bitOR(node.m_state.m_connected_nodes);
-      }
-    } else if (getNodeType(i) == NDB_MGM_NODE_TYPE_MGM)
-      no_mgm++;
   }
   bool found_matching_id= false;
   bool found_matching_type= false;
@@ -2227,6 +2243,10 @@ MgmtSrvr::alloc_node_id(NodeId * nodeId,
 	m_connect_address[id_found].s_addr= 0;
     }
     m_reserved_nodes.set(id_found);
+    char tmp_str[128];
+    m_reserved_nodes.getText(tmp_str);
+    g_EventLogger.info("Mgmt server state: nodeid %d reserved for ip %s, m_reserved_nodes %s.",
+		       id_found, get_connect_address(id_found), tmp_str);
     DBUG_RETURN(true);
   }
 
@@ -2283,6 +2303,36 @@ MgmtSrvr::alloc_node_id(NodeId * nodeId,
       error_string.appfmt("No node defined with id=%d in config file.",
 			  *nodeId);
   }
+
+  g_EventLogger.warning("Allocate nodeid (%d) failed. Connection from ip %s. "
+			"Returned error string \"%s\"",
+			*nodeId,
+			client_addr != 0 ? inet_ntoa(((struct sockaddr_in *)(client_addr))->sin_addr) : "<none>",
+			error_string.c_str());
+
+  NodeBitmask connected_nodes2;
+  get_connected_nodes(connected_nodes2);
+  {
+    BaseString tmp_connected, tmp_not_connected;
+    for(Uint32 i = 0; i < MAX_NODES; i++)
+    {
+      if (connected_nodes2.get(i))
+      {
+	if (!m_reserved_nodes.get(i))
+	  tmp_connected.appfmt(" %d", i);
+      }
+      else if (m_reserved_nodes.get(i))
+      {
+	tmp_not_connected.appfmt(" %d", i);
+      }
+    }
+    if (tmp_connected.length() > 0)
+      g_EventLogger.info("Mgmt server state: node id's %s connected but not reserved", 
+			 tmp_connected.c_str());
+    if (tmp_not_connected.length() > 0)
+      g_EventLogger.info("Mgmt server state: node id's %s not connected but reserved",
+			 tmp_not_connected.c_str());
+  }
   DBUG_RETURN(false);
 }
 
@@ -2531,10 +2581,15 @@ MgmtSrvr::Allocated_resources::~Allocated_resources()
 {
   Guard g(m_mgmsrv.m_node_id_mutex);
   if (!m_reserved_nodes.isclear()) {
+    m_mgmsrv.m_reserved_nodes.bitANDC(m_reserved_nodes); 
     // node has been reserved, force update signal to ndb nodes
     global_flag_send_heartbeat_now= 1;
+
+    char tmp_str[128];
+    m_mgmsrv.m_reserved_nodes.getText(tmp_str);
+    g_EventLogger.info("Mgmt server state: nodeid %d freed, m_reserved_nodes %s.",
+		       get_nodeid(), tmp_str);
   }
-  m_mgmsrv.m_reserved_nodes.bitANDC(m_reserved_nodes); 
 }
 
 void
@@ -2543,6 +2598,17 @@ MgmtSrvr::Allocated_resources::reserve_node(NodeId id)
   m_reserved_nodes.set(id);
 }
 
+NodeId
+MgmtSrvr::Allocated_resources::get_nodeid() const
+{
+  for(Uint32 i = 0; i < MAX_NODES; i++)
+  {
+    if (m_reserved_nodes.get(i))
+      return i;
+  }
+  return 0;
+}
+
 int
 MgmtSrvr::setDbParameter(int node, int param, const char * value,
 			 BaseString& msg){

ndb/src/mgmsrv/MgmtSrvr.hpp

@@ -96,7 +96,10 @@ public:
     // methods to reserve/allocate resources which
     // will be freed when running destructor
     void reserve_node(NodeId id);
-    bool is_reserved(NodeId nodeId) { return m_reserved_nodes.get(nodeId);}
+    bool is_reserved(NodeId nodeId) { return m_reserved_nodes.get(nodeId); }
+    bool is_reserved(NodeBitmask mask) { return !mask.bitAND(m_reserved_nodes).isclear(); }
+    bool isclear() { return m_reserved_nodes.isclear(); }
+    NodeId get_nodeid() const;
   private:
     MgmtSrvr &m_mgmsrv;
     NodeBitmask m_reserved_nodes;
@@ -173,6 +176,7 @@ public:
   /* Constructor */
 
   MgmtSrvr(NodeId nodeId,                    /* Local nodeid */
+	   SocketServer *socket_server,
 	   const BaseString &config_filename,      /* Where to save config */
 	   LocalConfig &local_config,  /* Ndb.cfg filename */
 	   Config * config); 
@@ -499,6 +503,9 @@ public:
   int setDbParameter(int node, int parameter, const char * value, BaseString&);
   
   const char *get_connect_address(Uint32 node_id) { return inet_ntoa(m_connect_address[node_id]); }
+  void get_connected_nodes(NodeBitmask &connected_nodes) const;
+  SocketServer *get_socket_server() { return m_socket_server; }
+
   //**************************************************************************
 private:
   //**************************************************************************
@@ -525,6 +532,8 @@ private:
   
   int _blockNumber;
   NodeId _ownNodeId;
+  SocketServer *m_socket_server;
+
   BlockReference _ownReference; 
   NdbMutex *m_configMutex;
   const Config * _config;

ndb/src/mgmsrv/Services.cpp

@@ -242,6 +242,8 @@ ParserRow<MgmApiSession> commands[] = {
     MGM_ARG("node", Int, Optional, "Node"),  
     MGM_ARG("filter", String, Mandatory, "Event category"),
 
+  MGM_CMD("purge stale sessions", &MgmApiSession::purge_stale_sessions, ""),
+
   MGM_END()
 };
 
@@ -1412,6 +1414,46 @@ done:
   m_output->println("");
 }
 
+struct PurgeStruct
+{
+  NodeBitmask free_nodes;/* free nodes as reported
+			  * by ndbd in apiRegReqConf
+			  */
+  BaseString *str;
+};
+
+void
+MgmApiSession::stop_session_if_not_connected(SocketServer::Session *_s, void *data)
+{
+  MgmApiSession *s= (MgmApiSession *)_s;
+  struct PurgeStruct &ps= *(struct PurgeStruct *)data;
+  if (s->m_allocated_resources->is_reserved(ps.free_nodes))
+  {
+    ps.str->appfmt(" %d", s->m_allocated_resources->get_nodeid());
+    s->stopSession();
+  }
+}
+
+void
+MgmApiSession::purge_stale_sessions(Parser_t::Context &ctx,
+				    const class Properties &args)
+{
+  struct PurgeStruct ps;
+  BaseString str;
+  ps.str = &str;
+
+  m_mgmsrv.get_connected_nodes(ps.free_nodes);
+  ps.free_nodes.bitXORC(NodeBitmask()); // invert connected_nodes to get free nodes
+
+  m_mgmsrv.get_socket_server()->foreachSession(stop_session_if_not_connected,&ps);
+
+  m_output->println("purge stale sessions reply");
+  if (str.length() > 0)
+    m_output->println("purged:%s",str.c_str());
+  m_output->println("result: Ok");
+  m_output->println("");
+}
+
 template class MutexVector<int>;
 template class Vector<ParserRow<MgmApiSession> const*>;
 template class Vector<unsigned short>;

ndb/src/mgmsrv/Services.hpp

@@ -28,7 +28,9 @@
 /** Undefine this to remove backwards compatibility for "GET CONFIG". */
 #define MGM_GET_CONFIG_BACKWARDS_COMPAT
 
-class MgmApiSession : public SocketServer::Session {
+class MgmApiSession : public SocketServer::Session
+{
+  static void stop_session_if_not_connected(SocketServer::Session *_s, void *data);
 private:
   typedef Parser<MgmApiSession> Parser_t;
 
@@ -84,6 +86,8 @@ public:
 
   void setParameter(Parser_t::Context &ctx, const class Properties &args);
   void listen_event(Parser_t::Context &ctx, const class Properties &args);
+
+  void purge_stale_sessions(Parser_t::Context &ctx, const class Properties &args);
   
   void repCommand(Parser_t::Context &ctx, const class Properties &args);
 };

ndb/src/mgmsrv/main.cpp

@@ -83,7 +83,6 @@ struct MgmGlobals {
 int g_no_nodeid_checks= 0;
 static MgmGlobals glob;
 
-
 /******************************************************************************
  * Function prototypes
  ******************************************************************************/
@@ -226,7 +225,7 @@ int main(int argc, char** argv)
   if (!readGlobalConfig())
     goto error_end;
 
-  glob.mgmObject = new MgmtSrvr(glob.localNodeId,
+  glob.mgmObject = new MgmtSrvr(glob.localNodeId, glob.socketServer,
 				BaseString(glob.config_filename),
 				local_config,
 				glob.cluster_config);