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arbiter.c
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/*
* arbiter.c
*
* Coordinate global transaction commit
*
*/
#include <unistd.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/utsname.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <arpa/inet.h>
#include <errno.h>
#include <netdb.h>
#include <time.h>
#include <fcntl.h>
#include "postgres.h"
#include "fmgr.h"
#include "miscadmin.h"
#include "pg_socket.h"
#include "postmaster/postmaster.h"
#include "postmaster/bgworker.h"
#include "storage/s_lock.h"
#include "storage/spin.h"
#include "storage/lmgr.h"
#include "storage/shmem.h"
#include "storage/ipc.h"
#include "access/xlogdefs.h"
#include "access/xact.h"
#include "access/xtm.h"
#include "access/transam.h"
#include "access/subtrans.h"
#include "access/commit_ts.h"
#include "access/xlog.h"
#include "storage/proc.h"
#include "storage/procarray.h"
#include "executor/executor.h"
#include "access/twophase.h"
#include "utils/guc.h"
#include "utils/hsearch.h"
#include "utils/tqual.h"
#include "utils/array.h"
#include "utils/builtins.h"
#include "utils/memutils.h"
#include "utils/timeout.h"
#include "commands/dbcommands.h"
#include "miscadmin.h"
#include "postmaster/autovacuum.h"
#include "storage/pmsignal.h"
#include "storage/proc.h"
#include "utils/syscache.h"
#include "replication/walsender.h"
#include "replication/slot.h"
#include "port/atomics.h"
#include "tcop/utility.h"
#include "libpq/ip.h"
#ifndef USE_EPOLL
#ifdef __linux__
#define USE_EPOLL 0
#else
#define USE_EPOLL 0
#endif
#endif
#if USE_EPOLL
#include <sys/epoll.h>
#else
#include <sys/select.h>
#endif
#include "multimaster.h"
#include "state.h"
#define MAX_ROUTES 16
#define INIT_BUFFER_SIZE 1024
#define HANDSHAKE_MAGIC 0xCAFEDEED
static int* sockets;
static int gateway;
static bool send_heartbeat;
static timestamp_t last_sent_heartbeat;
static TimeoutId heartbeat_timer;
static nodemask_t busy_mask;
static timestamp_t last_heartbeat_to_node[MAX_NODES];
static void MtmSender(Datum arg);
static void MtmReceiver(Datum arg);
static void MtmMonitor(Datum arg);
static void MtmSendHeartbeat(void);
static bool MtmSendToNode(int node, void const* buf, int size);
char const* const MtmMessageKindMnem[] =
{
"INVALID",
"HANDSHAKE",
"PREPARED",
"PRECOMMIT",
"PRECOMMITTED",
"ABORTED",
"STATUS",
"HEARTBEAT",
"POLL_REQUEST",
"POLL_STATUS"
};
static BackgroundWorker MtmSenderWorker = {
"mtm-sender",
BGWORKER_SHMEM_ACCESS | BGWORKER_BACKEND_DATABASE_CONNECTION,
BgWorkerStart_ConsistentState,
MULTIMASTER_BGW_RESTART_TIMEOUT,
MtmSender
};
static BackgroundWorker MtmRecevierWorker = {
"mtm-receiver",
BGWORKER_SHMEM_ACCESS | BGWORKER_BACKEND_DATABASE_CONNECTION,
BgWorkerStart_ConsistentState,
MULTIMASTER_BGW_RESTART_TIMEOUT,
MtmReceiver
};
static BackgroundWorker MtmMonitorWorker = {
"mtm-monitor",
BGWORKER_SHMEM_ACCESS | BGWORKER_BACKEND_DATABASE_CONNECTION,
BgWorkerStart_ConsistentState,
MULTIMASTER_BGW_RESTART_TIMEOUT,
MtmMonitor
};
void MtmArbiterInitialize(void)
{
MTM_ELOG(LOG, "Register background workers");
RegisterBackgroundWorker(&MtmSenderWorker);
RegisterBackgroundWorker(&MtmRecevierWorker);
RegisterBackgroundWorker(&MtmMonitorWorker);
}
static int stop = 0;
static void SetStop(int sig)
{
stop = 1;
}
#if USE_EPOLL
static int epollfd;
#else
static int max_fd;
static fd_set inset;
#endif
static void MtmRegisterSocket(int fd, int node)
{
#if USE_EPOLL
struct epoll_event ev;
ev.events = EPOLLIN;
ev.data.u32 = node;
if (epoll_ctl(epollfd, EPOLL_CTL_ADD, fd, &ev) < 0) {
MTM_ELOG(LOG, "Arbiter failed to add socket to epoll set: %s", strerror(errno));
}
#else
FD_SET(fd, &inset);
if (fd > max_fd) {
max_fd = fd;
}
#endif
}
static void MtmUnregisterSocket(int fd)
{
#if USE_EPOLL
if (epoll_ctl(epollfd, EPOLL_CTL_DEL, fd, NULL) < 0) {
MTM_ELOG(LOG, "Arbiter failed to unregister socket from epoll set: %s", strerror(errno));
}
#else
FD_CLR(fd, &inset);
#endif
}
static void MtmDisconnect(int node)
{
MtmUnregisterSocket(sockets[node]);
pg_closesocket(sockets[node], MtmUseRDMA);
sockets[node] = -1;
}
static int MtmWaitSocket(int sd, bool forWrite, timestamp_t timeoutMsec)
{
struct timeval tv;
fd_set set;
int rc;
timestamp_t deadline = MtmGetSystemTime() + MSEC_TO_USEC(timeoutMsec);
do {
timestamp_t now;
MtmCheckHeartbeat();
now = MtmGetSystemTime();
if (now > deadline) {
now = deadline;
}
FD_ZERO(&set);
FD_SET(sd, &set);
tv.tv_sec = (deadline - now)/USECS_PER_SEC;
tv.tv_usec = (deadline - now)%USECS_PER_SEC;
} while ((rc = pg_select(sd+1, forWrite ? NULL : &set, forWrite ? &set : NULL, NULL, &tv, MtmUseRDMA)) < 0 && errno == EINTR);
return rc;
}
static bool MtmWriteSocket(int sd, void const* buf, int size)
{
char* src = (char*)buf;
while (size != 0) {
int rc = MtmWaitSocket(sd, true, MtmHeartbeatSendTimeout);
if (rc == 1) {
while ((rc = pg_send(sd, src, size, 0, MtmUseRDMA)) < 0 && errno == EINTR);
if (rc < 0) {
if (errno == EINPROGRESS) {
continue;
}
return false;
}
size -= rc;
src += rc;
} else if (rc < 0) {
return false;
}
}
return true;
}
static int MtmReadSocket(int sd, void* buf, int buf_size)
{
int rc;
while ((rc = pg_recv(sd, buf, buf_size, 0, MtmUseRDMA)) < 0 && errno == EINTR);
if (rc <= 0 && (errno == EAGAIN || errno == EINPROGRESS)) {
rc = MtmWaitSocket(sd, false, MtmHeartbeatSendTimeout);
if (rc == 1) {
while ((rc = pg_recv(sd, buf, buf_size, 0, MtmUseRDMA)) < 0 && errno == EINTR);
}
}
return rc;
}
static void MtmSetSocketOptions(int sd)
{
#ifdef TCP_NODELAY
int on = 1;
if (pg_setsockopt(sd, IPPROTO_TCP, TCP_NODELAY, (char const*)&on, sizeof(on), MtmUseRDMA) < 0) {
MTM_ELOG(WARNING, "Failed to set TCP_NODELAY: %m");
}
#endif
if (pg_setsockopt(sd, SOL_SOCKET, SO_KEEPALIVE, (char const*)&on, sizeof(on), MtmUseRDMA) < 0) {
MTM_ELOG(WARNING, "Failed to set SO_KEEPALIVE: %m");
}
if (tcp_keepalives_idle) {
#ifdef TCP_KEEPIDLE
if (pg_setsockopt(sd, IPPROTO_TCP, TCP_KEEPIDLE,
(char *) &tcp_keepalives_idle, sizeof(tcp_keepalives_idle), MtmUseRDMA) < 0)
{
MTM_ELOG(WARNING, "Failed to set TCP_KEEPIDLE: %m");
}
#else
#ifdef TCP_KEEPALIVE
if (pg_setsockopt(sd, IPPROTO_TCP, TCP_KEEPALIVE,
(char *) &tcp_keepalives_idle, sizeof(tcp_keepalives_idle), MtmUseRDMA) < 0)
{
MTM_ELOG(WARNING, "Failed to set TCP_KEEPALIVE: %m");
}
#endif
#endif
}
#ifdef TCP_KEEPINTVL
if (tcp_keepalives_interval) {
if (pg_setsockopt(sd, IPPROTO_TCP, TCP_KEEPINTVL,
(char *) &tcp_keepalives_interval, sizeof(tcp_keepalives_interval), MtmUseRDMA) < 0)
{
MTM_ELOG(WARNING, "Failed to set TCP_KEEPINTVL: %m");
}
}
#endif
#ifdef TCP_KEEPCNT
if (tcp_keepalives_count) {
if (pg_setsockopt(sd, IPPROTO_TCP, TCP_KEEPCNT,
(char *) &tcp_keepalives_count, sizeof(tcp_keepalives_count), MtmUseRDMA) < 0)
{
MTM_ELOG(WARNING, "Failed to set TCP_KEEPCNT: %m");
}
}
#endif
}
/*
* Check response message and update onde state
*/
static void MtmCheckResponse(MtmArbiterMessage* resp)
{
if (resp->lockReq) {
BIT_SET(Mtm->inducedLockNodeMask, resp->node-1);
} else {
BIT_CLEAR(Mtm->inducedLockNodeMask, resp->node-1);
}
if (resp->locked) {
BIT_SET(Mtm->currentLockNodeMask, resp->node-1);
} else {
BIT_CLEAR(Mtm->currentLockNodeMask, resp->node-1);
}
// if (BIT_CHECK(resp->disabledNodeMask, MtmNodeId-1))
// {
// MtmStateProcessEvent(MTM_REMOTE_DISABLE);
// }
if (BIT_CHECK(Mtm->disabledNodeMask, resp->node-1) &&
sockets[resp->node-1] < 0)
{
/* We've received heartbeat from disabled node.
* Looks like it is restarted.
* Try to reconnect to it.
*/
MTM_ELOG(WARNING, "Receive heartbeat from disabled node %d", resp->node);
BIT_SET(Mtm->reconnectMask, resp->node-1);
}
}
static void MtmScheduleHeartbeat()
{
if (!stop) {
enable_timeout_after(heartbeat_timer, MtmHeartbeatSendTimeout);
send_heartbeat = true;
}
PGSemaphoreUnlock(&Mtm->sendSemaphore);
}
static void MtmSendHeartbeat()
{
int i;
MtmArbiterMessage msg;
timestamp_t now = MtmGetSystemTime();
MtmInitMessage(&msg, MSG_HEARTBEAT);
msg.node = MtmNodeId;
msg.csn = now;
if (last_sent_heartbeat != 0 && last_sent_heartbeat + MSEC_TO_USEC(MtmHeartbeatSendTimeout)*2 < now) {
MTM_LOG1("More than %lld microseconds since last heartbeat", now - last_sent_heartbeat);
}
last_sent_heartbeat = now;
for (i = 0; i < Mtm->nAllNodes; i++)
{
if (i+1 != MtmNodeId) {
if (!BIT_CHECK(busy_mask, i))
/*
* Old behaviour here can cause subtle bugs, for example
* it can happened that none of mentioned conditiotions is
* true when disabled node connects to a major node which
* is online. So just send it allways. --sk
*/
// && (Mtm->status != MTM_ONLINE
// || sockets[i] >= 0
// || !BIT_CHECK(Mtm->disabledNodeMask, i)
// || BIT_CHECK(Mtm->reconnectMask, i)))
{
if (!MtmSendToNode(i, &msg, sizeof(msg))) {
MTM_ELOG(LOG, "Arbiter failed to send heartbeat to node %d", i+1);
} else {
if (last_heartbeat_to_node[i] + MSEC_TO_USEC(MtmHeartbeatSendTimeout)*2 < now) {
MTM_LOG1("Last heartbeat to node %d was sent %lld microseconds ago", i+1, now - last_heartbeat_to_node[i]);
}
last_heartbeat_to_node[i] = now;
/* Connectivity mask can be cleared by MtmWatchdog: in this case sockets[i] >= 0 */
if (BIT_CHECK(SELF_CONNECTIVITY_MASK, i)) {
MTM_LOG1("Force reconnect to node %d", i+1);
pg_closesocket(sockets[i], MtmUseRDMA);
sockets[i] = -1;
MtmReconnectNode(i+1); /* set reconnect mask to force node reconnent */
}
MTM_LOG4("Send heartbeat to node %d with timestamp %lld", i+1, now);
}
} else {
MTM_LOG2("Do not send heartbeat to node %d, busy mask %lld, status %s", i+1, busy_mask, MtmNodeStatusMnem[Mtm->status]);
}
}
}
}
/* This function should be called from all places where sender can be blocked.
* It checks send_heartbeat flag set by timer and if it is set then sends heartbeats to all alive nodes
*/
void MtmCheckHeartbeat()
{
if (send_heartbeat && !stop) {
send_heartbeat = false;
enable_timeout_after(heartbeat_timer, MtmHeartbeatSendTimeout);
MtmSendHeartbeat();
}
}
static int MtmConnectSocket(int node, int port)
{
struct addrinfo *addrs = NULL;
struct addrinfo *addr;
struct addrinfo hint;
char portstr[MAXPGPATH];
MtmHandshakeMessage req;
MtmArbiterMessage resp;
int sd = -1;
int rc;
char const* host = Mtm->nodes[node].con.hostName;
nodemask_t save_mask = busy_mask;
/* Initialize hint structure */
MemSet(&hint, 0, sizeof(hint));
hint.ai_socktype = SOCK_STREAM;
hint.ai_family = AF_UNSPEC;
snprintf(portstr, sizeof(portstr), "%d", port);
rc = pg_getaddrinfo_all(host, portstr, &hint, &addrs);
if (rc != 0)
{
MTM_ELOG(LOG, "Arbiter failed to resolve host '%s' by name: %s", host, gai_strerror(rc));
return -1;
}
BIT_SET(busy_mask, node);
Retry:
sd = pg_socket(AF_INET, SOCK_STREAM, 0, MtmUseRDMA);
if (sd < 0) {
MTM_ELOG(LOG, "Arbiter failed to create socket: %s", strerror(errno));
goto Error;
}
rc = pg_fcntl(sd, F_SETFL, O_NONBLOCK, MtmUseRDMA);
if (rc < 0) {
MTM_ELOG(LOG, "Arbiter failed to switch socket to non-blocking mode: %s", strerror(errno));
goto Error;
}
for (addr = addrs; addr != NULL; addr = addr->ai_next)
{
do {
rc = pg_connect(sd, addr->ai_addr, addr->ai_addrlen, MtmUseRDMA);
} while (rc < 0 && errno == EINTR);
if (rc >= 0 || errno == EINPROGRESS) {
break;
}
}
if (rc != 0 && errno == EINPROGRESS) {
rc = MtmWaitSocket(sd, true, MtmHeartbeatSendTimeout);
if (rc == 1) {
socklen_t optlen = sizeof(int);
int errcode;
if (pg_getsockopt(sd, SOL_SOCKET, SO_ERROR, (void*)&errcode, &optlen, MtmUseRDMA) < 0) {
MTM_ELOG(WARNING, "Arbiter failed to getsockopt for %s:%d: %s", host, port, strerror(errcode));
goto Error;
}
if (errcode != 0) {
MTM_ELOG(WARNING, "Arbiter trying to connect to %s:%d: %s", host, port, strerror(errcode));
goto Error;
}
} else if (rc == 0) {
MTM_ELOG(WARNING, "Arbiter failed to connect to socket to %s:%d within specified timeout", host, port);
goto Error;
} else {
MTM_ELOG(WARNING, "Arbiter failed to wait socket to %s:%d: %s", host, port, strerror(errno));
goto Error;
}
}
else if (rc != 0) {
MTM_ELOG(WARNING, "Arbiter failed to connect to %s:%d: (%d) %s", host, port, rc, strerror(errno));
goto Error;
}
MtmSetSocketOptions(sd);
MtmInitMessage(&req.hdr, MSG_HANDSHAKE);
req.hdr.node = MtmNodeId;
req.hdr.dxid = HANDSHAKE_MAGIC;
req.hdr.sxid = ShmemVariableCache->nextXid;
req.hdr.csn = MtmGetCurrentTime();
strcpy(req.connStr, Mtm->nodes[MtmNodeId-1].con.connStr);
if (!MtmWriteSocket(sd, &req, sizeof req)) {
MTM_ELOG(WARNING, "Arbiter failed to send handshake message to %s:%d: %s", host, port, strerror(errno));
pg_closesocket(sd, MtmUseRDMA);
goto Retry;
}
if (MtmReadSocket(sd, &resp, sizeof resp) != sizeof(resp)) {
MTM_ELOG(WARNING, "Arbiter failed to receive response for handshake message from %s:%d: %s", host, port, strerror(errno));
pg_closesocket(sd, MtmUseRDMA);
goto Retry;
}
if (resp.code != MSG_STATUS || resp.dxid != HANDSHAKE_MAGIC) {
MTM_ELOG(WARNING, "Arbiter get unexpected response %d for handshake message from %s:%d", resp.code, host, port);
pg_closesocket(sd, MtmUseRDMA);
goto Retry;
}
if (addrs)
pg_freeaddrinfo_all(hint.ai_family, addrs);
MtmLock(LW_EXCLUSIVE);
MtmCheckResponse(&resp);
MtmUnlock();
MtmOnNodeConnect(node+1);
busy_mask = save_mask;
return sd;
Error:
busy_mask = save_mask;
if (sd >= 0) {
pg_closesocket(sd, MtmUseRDMA);
}
if (addrs) {
pg_freeaddrinfo_all(hint.ai_family, addrs);
}
return -1;
}
static void MtmOpenConnections()
{
int nNodes = MtmMaxNodes;
int i;
sockets = (int*)palloc(sizeof(int)*nNodes);
for (i = 0; i < nNodes; i++) {
sockets[i] = -1;
}
for (i = 0; i < nNodes; i++) {
if (i+1 != MtmNodeId && i < Mtm->nAllNodes) {
sockets[i] = MtmConnectSocket(i, Mtm->nodes[i].con.arbiterPort);
}
}
MtmStateProcessEvent(MTM_ARBITER_RECEIVER_START);
}
static bool MtmSendToNode(int node, void const* buf, int size)
{
bool result = true;
nodemask_t save_mask = busy_mask;
BIT_SET(busy_mask, node);
while (true) {
#if 0
/* Original intention was to reestablish connection when reconnect mask is set to avoid hanged-up connection.
* But reconnectMask is set not only when connection is broken, so breaking connection in all this cases cause avalanche of connection failures.
*/
if (sockets[node] >= 0 && BIT_CHECK(Mtm->reconnectMask, node)) {
MTM_ELOG(WARNING, "Arbiter is forced to reconnect to node %d", node+1);
pg_closesocket(sockets[node], MtmUseRDMA);
sockets[node] = -1;
}
#endif
if (BIT_CHECK(Mtm->reconnectMask, node)) {
MtmLock(LW_EXCLUSIVE);
BIT_CLEAR(Mtm->reconnectMask, node);
MtmUnlock();
}
if (sockets[node] < 0 || !MtmWriteSocket(sockets[node], buf, size)) {
if (sockets[node] >= 0) {
MTM_ELOG(WARNING, "Arbiter fail to write to node %d: %s", node+1, strerror(errno));
pg_closesocket(sockets[node], MtmUseRDMA);
sockets[node] = -1;
}
sockets[node] = MtmConnectSocket(node, Mtm->nodes[node].con.arbiterPort);
if (sockets[node] < 0) {
result = false;
break;
}
MTM_LOG1("Arbiter reestablish connection with node %d", node+1);
} else {
result = true;
break;
}
}
busy_mask = save_mask;
return result;
}
static int MtmReadFromNode(int node, void* buf, int buf_size)
{
int rc = MtmReadSocket(sockets[node], buf, buf_size);
if (rc <= 0) {
MTM_ELOG(WARNING, "Arbiter failed to read from node=%d: %s", node+1, strerror(errno));
MtmDisconnect(node);
}
return rc;
}
static void MtmAcceptOneConnection()
{
int fd = pg_accept(gateway, NULL, NULL, MtmUseRDMA);
if (fd < 0) {
MTM_ELOG(WARNING, "Arbiter failed to accept socket: %s", strerror(errno));
} else {
MtmHandshakeMessage req;
MtmArbiterMessage resp;
int rc = pg_fcntl(fd, F_SETFL, O_NONBLOCK, MtmUseRDMA);
if (rc < 0) {
MTM_ELOG(ERROR, "Arbiter failed to switch socket to non-blocking mode: %s", strerror(errno));
}
rc = MtmReadSocket(fd, &req, sizeof req);
if (rc < sizeof(req)) {
MTM_ELOG(WARNING, "Arbiter failed to handshake socket: %s", strerror(errno));
pg_closesocket(fd, MtmUseRDMA);
} else if (req.hdr.code != MSG_HANDSHAKE && req.hdr.dxid != HANDSHAKE_MAGIC) {
MTM_ELOG(WARNING, "Arbiter failed to handshake socket: %s", strerror(errno));
pg_closesocket(fd, MtmUseRDMA);
} else {
int node = req.hdr.node-1;
Assert(node >= 0 && node < Mtm->nAllNodes && node+1 != MtmNodeId);
MtmLock(LW_EXCLUSIVE);
MtmCheckResponse(&req.hdr);
MtmUnlock();
MtmInitMessage(&resp, MSG_STATUS);
resp.dxid = HANDSHAKE_MAGIC;
resp.sxid = ShmemVariableCache->nextXid;
resp.csn = MtmGetCurrentTime();
resp.node = MtmNodeId;
MtmUpdateNodeConnectionInfo(&Mtm->nodes[node].con, req.connStr);
if (!MtmWriteSocket(fd, &resp, sizeof resp)) {
MTM_ELOG(WARNING, "Arbiter failed to write response for handshake message to node %d", node+1);
pg_closesocket(fd, MtmUseRDMA);
} else {
MTM_LOG1("Arbiter established connection with node %d", node+1);
if (sockets[node] >= 0) {
MtmUnregisterSocket(sockets[node]);
}
sockets[node] = fd;
MtmRegisterSocket(fd, node);
MtmOnNodeConnect(node+1);
}
}
}
}
static void MtmAcceptIncomingConnections()
{
struct sockaddr_in sock_inet;
int on = 1;
int i;
int nNodes = MtmMaxNodes;
sockets = (int*)palloc(sizeof(int)*nNodes);
for (i = 0; i < nNodes; i++) {
sockets[i] = -1;
}
sock_inet.sin_family = AF_INET;
sock_inet.sin_addr.s_addr = htonl(INADDR_ANY);
sock_inet.sin_port = htons(MtmArbiterPort);
gateway = pg_socket(sock_inet.sin_family, SOCK_STREAM, 0, MtmUseRDMA);
if (gateway < 0) {
MTM_ELOG(ERROR, "Arbiter failed to create socket: %s", strerror(errno));
}
if (pg_setsockopt(gateway, SOL_SOCKET, SO_REUSEADDR, (char*)&on, sizeof on, MtmUseRDMA) < 0) {
MTM_ELOG(ERROR, "Arbiter failed to set options for socket: %s", strerror(errno));
}
if (pg_bind(gateway, (struct sockaddr*)&sock_inet, sizeof(sock_inet), MtmUseRDMA) < 0) {
MTM_ELOG(ERROR, "Arbiter failed to bind socket: %s", strerror(errno));
}
if (pg_listen(gateway, nNodes, MtmUseRDMA) < 0) {
MTM_ELOG(ERROR, "Arbiter failed to listen socket: %s", strerror(errno));
}
sockets[MtmNodeId-1] = gateway;
MtmRegisterSocket(gateway, MtmNodeId-1);
}
static void MtmAppendBuffer(MtmBuffer* txBuffer, MtmArbiterMessage* msg)
{
MtmBuffer* buf = &txBuffer[msg->node-1];
if (buf->used == buf->size) {
if (buf->size == 0) {
buf->size = INIT_BUFFER_SIZE;
buf->data = palloc(buf->size * sizeof(MtmArbiterMessage));
} else {
buf->size *= 2;
buf->data = repalloc(buf->data, buf->size * sizeof(MtmArbiterMessage));
}
}
msg->node = MtmNodeId;
buf->data[buf->used++] = *msg;
}
static void MtmSender(Datum arg)
{
int nNodes = MtmMaxNodes;
int i;
MtmBuffer* txBuffer;
MtmBackgroundWorker = true;
txBuffer = (MtmBuffer*)palloc0(sizeof(MtmBuffer)*nNodes);
MTM_ELOG(LOG, "Start arbiter sender %d", MyProcPid);
InitializeTimeouts();
pqsignal(SIGINT, SetStop);
pqsignal(SIGQUIT, SetStop);
pqsignal(SIGTERM, SetStop);
pqsignal(SIGHUP, PostgresSigHupHandler);
/* We're now ready to receive signals */
BackgroundWorkerUnblockSignals();
/* Connect to a database */
BackgroundWorkerInitializeConnection(MtmDatabaseName, NULL);
/* Start heartbeat times */
heartbeat_timer = RegisterTimeout(USER_TIMEOUT, MtmScheduleHeartbeat);
enable_timeout_after(heartbeat_timer, MtmHeartbeatSendTimeout);
MtmOpenConnections();
while (!stop) {
MtmMessageQueue *curr, *next;
PGSemaphoreLock(&Mtm->sendSemaphore);
CHECK_FOR_INTERRUPTS();
if (ConfigReloadPending)
{
ConfigReloadPending = false;
ProcessConfigFile(PGC_SIGHUP);
}
MtmCheckHeartbeat();
/*
* Use shared lock to improve locality,
* because all other process modifying this list are using exclusive lock
*/
SpinLockAcquire(&Mtm->queueSpinlock);
for (curr = Mtm->sendQueue; curr != NULL; curr = next) {
next = curr->next;
MtmAppendBuffer(txBuffer, &curr->msg);
curr->next = Mtm->freeQueue;
Mtm->freeQueue = curr;
}
Mtm->sendQueue = NULL;
SpinLockRelease(&Mtm->queueSpinlock);
for (i = 0; i < Mtm->nAllNodes; i++) {
if (txBuffer[i].used != 0) {
MtmSendToNode(i, txBuffer[i].data, txBuffer[i].used*sizeof(MtmArbiterMessage));
txBuffer[i].used = 0;
}
}
CHECK_FOR_INTERRUPTS();
MtmCheckHeartbeat();
}
MTM_ELOG(LOG, "Stop arbiter sender %d", MyProcPid);
proc_exit(1); /* force restart of this bgwroker */
}
#if !USE_EPOLL
static bool MtmRecovery()
{
int nNodes = Mtm->nAllNodes;
bool recovered = false;
int i;
for (i = 0; i < nNodes; i++) {
int sd = sockets[i];
if (sd >= 0 && FD_ISSET(sd, &inset)) {
struct timeval tm = {0,0};
fd_set tryset;
FD_ZERO(&tryset);
FD_SET(sd, &tryset);
if (pg_select(sd+1, &tryset, NULL, NULL, &tm, MtmUseRDMA) < 0) {
MTM_ELOG(WARNING, "Arbiter lost connection with node %d", i+1);
MtmDisconnect(i);
recovered = true;
}
}
}
return recovered;
}
#endif
static void MtmMonitor(Datum arg)
{
pqsignal(SIGINT, SetStop);
pqsignal(SIGQUIT, SetStop);
pqsignal(SIGTERM, SetStop);
pqsignal(SIGHUP, PostgresSigHupHandler);
MtmBackgroundWorker = true;
/* We're now ready to receive signals */
BackgroundWorkerUnblockSignals();
/* Connect to a database */
BackgroundWorkerInitializeConnection(MtmDatabaseName, NULL);
while (!stop) {
int rc = WaitLatch(&MyProc->procLatch, WL_TIMEOUT | WL_POSTMASTER_DEATH, MtmHeartbeatRecvTimeout);
if (rc & WL_POSTMASTER_DEATH) {
break;
}
if (ConfigReloadPending)
{
ConfigReloadPending = false;
ProcessConfigFile(PGC_SIGHUP);
}
MtmRefreshClusterStatus();
}
}
static void MtmReceiver(Datum arg)
{
int nNodes = MtmMaxNodes;
int nResponses;
int i, j, n, rc;
MtmBuffer* rxBuffer = (MtmBuffer*)palloc0(sizeof(MtmBuffer)*nNodes);
timestamp_t lastHeartbeatCheck = MtmGetSystemTime();
timestamp_t now;
timestamp_t selectTimeout = MtmHeartbeatRecvTimeout;
#if USE_EPOLL
struct epoll_event* events = (struct epoll_event*)palloc(sizeof(struct epoll_event)*nNodes);
epollfd = epoll_create(nNodes);
#else
FD_ZERO(&inset);
max_fd = 0;
#endif
pqsignal(SIGINT, SetStop);
pqsignal(SIGQUIT, SetStop);
pqsignal(SIGTERM, SetStop);
pqsignal(SIGHUP, PostgresSigHupHandler);
MtmBackgroundWorker = true;
/* We're now ready to receive signals */
BackgroundWorkerUnblockSignals();
/* Connect to a database */
BackgroundWorkerInitializeConnection(MtmDatabaseName, NULL);
MtmAcceptIncomingConnections();
for (i = 0; i < nNodes; i++) {
rxBuffer[i].size = INIT_BUFFER_SIZE;
rxBuffer[i].data = palloc(INIT_BUFFER_SIZE*sizeof(MtmArbiterMessage));
}
while (!stop) {
#if USE_EPOLL
n = epoll_wait(epollfd, events, nNodes, selectTimeout);
if (n < 0) {
if (errno == EINTR) {
continue;
}
MTM_ELOG(ERROR, "Arbiter failed to poll sockets: %s", strerror(errno));
}
for (j = 0; j < n; j++) {
i = events[j].data.u32;
if (events[j].events & EPOLLERR) {
MTM_ELOG(WARNING, "Arbiter lost connection with node %d", i+1);
MtmDisconnect(i);
}
}
for (j = 0; j < n; j++) {
if (events[j].events & EPOLLIN)
#else
fd_set events;
if (ConfigReloadPending)
{
ConfigReloadPending = false;
ProcessConfigFile(PGC_SIGHUP);
}
do {
struct timeval tv;
events = inset;
tv.tv_sec = selectTimeout/1000;
tv.tv_usec = selectTimeout%1000*1000;
do {
n = pg_select(max_fd+1, &events, NULL, NULL, &tv, MtmUseRDMA);
} while (n < 0 && errno == EINTR);
} while (n < 0 && MtmRecovery());
if (n < 0) {
MTM_ELOG(ERROR, "Arbiter failed to select sockets: %s", strerror(errno));
}
for (i = 0; i < nNodes; i++) {
if (sockets[i] >= 0 && FD_ISSET(sockets[i], &events))
#endif
{
if (i+1 == MtmNodeId) {
Assert(sockets[i] == gateway);
MtmAcceptOneConnection();
continue;
}
rc = MtmReadFromNode(i, (char*)rxBuffer[i].data + rxBuffer[i].used, rxBuffer[i].size-rxBuffer[i].used);
if (rc <= 0) {
MTM_LOG1("Failed to read response from node %d", i+1);
continue;
}
rxBuffer[i].used += rc;
nResponses = rxBuffer[i].used/sizeof(MtmArbiterMessage);
MtmLock(LW_EXCLUSIVE);
for (j = 0; j < nResponses; j++) {
MtmArbiterMessage* msg = &rxBuffer[i].data[j];
MtmTransState* ts;
MtmTransMap* tm;
int node = msg->node;
Assert(node > 0 && node <= nNodes && node != MtmNodeId);
if (Mtm->nodes[node-1].connectivityMask != msg->connectivityMask) {
MTM_ELOG(LOG, "Node %d changes it connectivity mask from %llx to %llx", node, Mtm->nodes[node-1].connectivityMask, msg->connectivityMask);
}
Mtm->nodes[node-1].oldestSnapshot = msg->oldestSnapshot;
Mtm->nodes[node-1].disabledNodeMask = msg->disabledNodeMask;
Mtm->nodes[node-1].connectivityMask = msg->connectivityMask;
Mtm->nodes[node-1].lastHeartbeat = MtmGetSystemTime();
MtmCheckResponse(msg);
MTM_LOG2("Receive response %s for transaction %s from node %d", MtmMessageKindMnem[msg->code], msg->gid, node);
switch (msg->code) {
case MSG_HEARTBEAT:
MTM_LOG4("Receive HEARTBEAT from node %d with timestamp %lld delay %lld",
node, msg->csn, USEC_TO_MSEC(MtmGetSystemTime() - msg->csn));
Mtm->nodes[node-1].nHeartbeats += 1;
continue;
case MSG_POLL_REQUEST:
Assert(*msg->gid);
tm = (MtmTransMap*)hash_search(MtmGid2State, msg->gid, HASH_FIND, NULL);
if (tm == NULL || tm->state == NULL) {
MTM_ELOG(WARNING, "Request for unexisted transaction %s from node %d", msg->gid, node);
msg->status = TRANSACTION_STATUS_ABORTED;
} else {
msg->status = tm->state->status;
msg->csn = tm->state->csn;
MTM_LOG1("Send response %s for transaction %s to node %d", MtmTxnStatusMnem[msg->status], msg->gid, node);
}
MtmInitMessage(msg, MSG_POLL_STATUS);
MtmSendMessage(msg);
continue;
case MSG_POLL_STATUS:
Assert(*msg->gid);
tm = (MtmTransMap*)hash_search(MtmGid2State, msg->gid, HASH_FIND, NULL);
if (tm == NULL || tm->state == NULL) {
MTM_ELOG(WARNING, "Response for non-existing transaction %s from node %d", msg->gid, node);
} else {
ts = tm->state;
BIT_SET(ts->votedMask, node-1);
if (ts->status == TRANSACTION_STATUS_UNKNOWN || ts->status == TRANSACTION_STATUS_IN_PROGRESS) {
if (msg->status == TRANSACTION_STATUS_IN_PROGRESS || msg->status == TRANSACTION_STATUS_ABORTED) {
MTM_ELOG(LOG, "Abort prepared transaction %s because it is in state %s at node %d",
msg->gid, MtmTxnStatusMnem[msg->status], node);
replorigin_session_origin = DoNotReplicateId;
TXFINISH("%s ABORT, MSG_POLL_STATUS", msg->gid);
MtmFinishPreparedTransaction(ts, false);
replorigin_session_origin = InvalidRepOriginId;
}
else if (msg->status == TRANSACTION_STATUS_COMMITTED || msg->status == TRANSACTION_STATUS_UNKNOWN)
{
if (msg->csn > ts->csn) {
ts->csn = msg->csn;
MtmSyncClock(ts->csn);
}
if ((ts->participantsMask & ~Mtm->disabledNodeMask & ~ts->votedMask) == 0) {