本节中显示的示例说明了在单个应用程序的多个集群上使用 MGM API 处理日志事件。
该程序的源代码可以在 NDB Cluster 源代码树中的
storage/ndb/ndbapi-examples/mgmapi_logevent2/main.cpp.
笔记
此文件以前命名为
mgmapi_logevent2.cpp.
#include <mysql.h>
#include <ndbapi/NdbApi.hpp>
#include <mgmapi.h>
#include <stdio.h>
#include <stdlib.h>
/*
* export LD_LIBRARY_PATH=../../../libmysql_r/.libs:../../../ndb/src/.libs
*/
#define MGMERROR(h) \
{ \
fprintf(stderr, "code: %d msg: %s\n", \
ndb_mgm_get_latest_error(h), \
ndb_mgm_get_latest_error_msg(h)); \
exit(-1); \
}
#define LOGEVENTERROR(h) \
{ \
fprintf(stderr, "code: %d msg: %s\n", \
ndb_logevent_get_latest_error(h), \
ndb_logevent_get_latest_error_msg(h)); \
exit(-1); \
}
int main(int argc, char** argv)
{
NdbMgmHandle h1,h2;
NdbLogEventHandle le1,le2;
int filter[] = { 15, NDB_MGM_EVENT_CATEGORY_BACKUP,
15, NDB_MGM_EVENT_CATEGORY_CONNECTION,
15, NDB_MGM_EVENT_CATEGORY_NODE_RESTART,
15, NDB_MGM_EVENT_CATEGORY_STARTUP,
15, NDB_MGM_EVENT_CATEGORY_ERROR,
0 };
struct ndb_logevent event1, event2;
if (argc < 3)
{
printf("Arguments are <connect_string cluster 1>",
"<connect_string cluster 2> [<iterations>].\n");
exit(-1);
}
const char *connectstring1 = argv[1];
const char *connectstring2 = argv[2];
int iterations = -1;
if (argc > 3)
iterations = atoi(argv[3]);
ndb_init();
h1= ndb_mgm_create_handle();
h2= ndb_mgm_create_handle();
if ( h1 == 0 || h2 == 0 )
{
printf("Unable to create handle\n");
exit(-1);
}
if (ndb_mgm_set_connectstring(h1, connectstring1) == -1 ||
ndb_mgm_set_connectstring(h2, connectstring1))
{
printf("Unable to set connection string\n");
exit(-1);
}
if (ndb_mgm_connect(h1,0,0,0)) MGMERROR(h1);
if (ndb_mgm_connect(h2,0,0,0)) MGMERROR(h2);
if ((le1= ndb_mgm_create_logevent_handle(h1, filter)) == 0) MGMERROR(h1);
if ((le2= ndb_mgm_create_logevent_handle(h1, filter)) == 0) MGMERROR(h2);
while (iterations-- != 0)
{
int timeout= 1000;
int r1= ndb_logevent_get_next(le1,&event1,timeout);
if (r1 == 0)
printf("No event within %d milliseconds\n", timeout);
else if (r1 < 0)
LOGEVENTERROR(le1)
else
{
switch (event1.type) {
case NDB_LE_BackupStarted:
printf("Node %d: BackupStarted\n", event1.source_nodeid);
printf(" Starting node ID: %d\n", event1.BackupStarted.starting_node);
printf(" Backup ID: %d\n", event1.BackupStarted.backup_id);
break;
case NDB_LE_BackupCompleted:
printf("Node %d: BackupCompleted\n", event1.source_nodeid);
printf(" Backup ID: %d\n", event1.BackupStarted.backup_id);
break;
case NDB_LE_BackupAborted:
printf("Node %d: BackupAborted\n", event1.source_nodeid);
break;
case NDB_LE_BackupFailedToStart:
printf("Node %d: BackupFailedToStart\n", event1.source_nodeid);
break;
case NDB_LE_NodeFailCompleted:
printf("Node %d: NodeFailCompleted\n", event1.source_nodeid);
break;
case NDB_LE_ArbitResult:
printf("Node %d: ArbitResult\n", event1.source_nodeid);
printf(" code %d, arbit_node %d\n",
event1.ArbitResult.code & 0xffff,
event1.ArbitResult.arbit_node);
break;
case NDB_LE_DeadDueToHeartbeat:
printf("Node %d: DeadDueToHeartbeat\n", event1.source_nodeid);
printf(" node %d\n", event1.DeadDueToHeartbeat.node);
break;
case NDB_LE_Connected:
printf("Node %d: Connected\n", event1.source_nodeid);
printf(" node %d\n", event1.Connected.node);
break;
case NDB_LE_Disconnected:
printf("Node %d: Disconnected\n", event1.source_nodeid);
printf(" node %d\n", event1.Disconnected.node);
break;
case NDB_LE_NDBStartCompleted:
printf("Node %d: StartCompleted\n", event1.source_nodeid);
printf(" version %d.%d.%d\n",
event1.NDBStartCompleted.version >> 16 & 0xff,
event1.NDBStartCompleted.version >> 8 & 0xff,
event1.NDBStartCompleted.version >> 0 & 0xff);
break;
case NDB_LE_ArbitState:
printf("Node %d: ArbitState\n", event1.source_nodeid);
printf(" code %d, arbit_node %d\n",
event1.ArbitState.code & 0xffff,
event1.ArbitResult.arbit_node);
break;
default:
break;
}
}
int r2= ndb_logevent_get_next(le1,&event2,timeout);
if (r2 == 0)
printf("No event within %d milliseconds\n", timeout);
else if (r2 < 0)
LOGEVENTERROR(le2)
else
{
switch (event2.type) {
case NDB_LE_BackupStarted:
printf("Node %d: BackupStarted\n", event2.source_nodeid);
printf(" Starting node ID: %d\n", event2.BackupStarted.starting_node);
printf(" Backup ID: %d\n", event2.BackupStarted.backup_id);
break;
case NDB_LE_BackupCompleted:
printf("Node %d: BackupCompleted\n", event2.source_nodeid);
printf(" Backup ID: %d\n", event2.BackupStarted.backup_id);
break;
case NDB_LE_BackupAborted:
printf("Node %d: BackupAborted\n", event2.source_nodeid);
break;
case NDB_LE_BackupFailedToStart:
printf("Node %d: BackupFailedToStart\n", event2.source_nodeid);
break;
case NDB_LE_NodeFailCompleted:
printf("Node %d: NodeFailCompleted\n", event2.source_nodeid);
break;
case NDB_LE_ArbitResult:
printf("Node %d: ArbitResult\n", event2.source_nodeid);
printf(" code %d, arbit_node %d\n",
event2.ArbitResult.code & 0xffff,
event2.ArbitResult.arbit_node);
break;
case NDB_LE_DeadDueToHeartbeat:
printf("Node %d: DeadDueToHeartbeat\n", event2.source_nodeid);
printf(" node %d\n", event2.DeadDueToHeartbeat.node);
break;
case NDB_LE_Connected:
printf("Node %d: Connected\n", event2.source_nodeid);
printf(" node %d\n", event2.Connected.node);
break;
case NDB_LE_Disconnected:
printf("Node %d: Disconnected\n", event2.source_nodeid);
printf(" node %d\n", event2.Disconnected.node);
break;
case NDB_LE_NDBStartCompleted:
printf("Node %d: StartCompleted\n", event2.source_nodeid);
printf(" version %d.%d.%d\n",
event2.NDBStartCompleted.version >> 16 & 0xff,
event2.NDBStartCompleted.version >> 8 & 0xff,
event2.NDBStartCompleted.version >> 0 & 0xff);
break;
case NDB_LE_ArbitState:
printf("Node %d: ArbitState\n", event2.source_nodeid);
printf(" code %d, arbit_node %d\n",
event2.ArbitState.code & 0xffff,
event2.ArbitResult.arbit_node);
break;
default:
break;
}
}
}
ndb_mgm_destroy_logevent_handle(&le1);
ndb_mgm_destroy_logevent_handle(&le2);
ndb_mgm_destroy_handle(&h1);
ndb_mgm_destroy_handle(&h2);
ndb_end(0);
return 0;
}