int gtmrecv_poll_actions1(int *pending_data_len, int *buff_unprocessed, unsigned char *buffp)
{
static int report_cnt = 1;
static int next_report_at = 1;
static boolean_t send_xoff = FALSE;
static boolean_t xoff_sent = FALSE;
static seq_num send_seqno;
static boolean_t log_draining_msg = FALSE;
static boolean_t send_badtrans = FALSE;
static boolean_t send_cmp2uncmp = FALSE;
static boolean_t upd_shut_too_early_logged = FALSE;
static time_t last_reap_time = 0;
repl_msg_t xoff_msg;
repl_badtrans_msg_t bad_trans_msg;
boolean_t alert = FALSE, info = FALSE;
int return_status;
gd_region *region_top;
unsigned char *msg_ptr; /* needed for REPL_{SEND,RECV}_LOOP */
int tosend_len, sent_len, sent_this_iter; /* needed for REPL_SEND_LOOP */
int torecv_len, recvd_len, recvd_this_iter; /* needed for REPL_RECV_LOOP */
int status, poll_dir; /* needed for REPL_{SEND,RECV}_LOOP */
int temp_len, pending_msg_size;
int upd_start_status, upd_start_attempts;
int buffered_data_len;
int upd_exit_status;
seq_num temp_send_seqno;
boolean_t bad_trans_detected = FALSE, onln_rlbk_flg_set = FALSE;
recvpool_ctl_ptr_t recvpool_ctl;
upd_proc_local_ptr_t upd_proc_local;
gtmrecv_local_ptr_t gtmrecv_local;
upd_helper_ctl_ptr_t upd_helper_ctl;
pid_t waitpid_res;
int4 msg_type, msg_len;
DCL_THREADGBL_ACCESS;
SETUP_THREADGBL_ACCESS;
recvpool_ctl = recvpool.recvpool_ctl;
upd_proc_local = recvpool.upd_proc_local;
gtmrecv_local = recvpool.gtmrecv_local;
upd_helper_ctl = recvpool.upd_helper_ctl;
if (SHUTDOWN == gtmrecv_local->shutdown)
{
repl_log(gtmrecv_log_fp, TRUE, TRUE, "Shutdown signalled\n");
gtmrecv_end(); /* Won't return */
}
# ifdef GTM_TLS
/* If we sent a REPL_RENEG_ACK, then we cannot afford to send anymore asynchronous messages (like XOFF_ACK_ME) until we
* receive a REPL_RENEG_COMPLETE from the source server. This ensures that while the source server attempts to do a SSL/TLS
* renegotiation, it doesn't have any application data (like XOFF_ACK_ME) sitting in the pipe.
*/
if (REPLTLS_WAITING_FOR_RENEG_COMPLETE == repl_tls.renegotiate_state)
return STOP_POLL;
# endif
/* Reset report_cnt and next_report_at to 1 when a new upd proc is forked */
if ((1 == report_cnt) || (report_cnt == next_report_at))
{
/* A comment on the usage of NO_SHUTDOWN below for the alert variable. Since upd_proc_local->upd_proc_shutdown is
* a shared memory field (and could be concurrently changed by either the receiver server or the update process),
* we want to make sure it is the same value BEFORE and AFTER checking whether the update process is alive or not.
* If it is not NO_SHUTDOWN (i.e. is SHUTDOWN or NORMAL_SHUTDOWN or ABNORMAL_SHUTDOWN) it has shut down due to
* an external request so we do want to send out a false update-process-is-not-alive alert.
*/
if ((alert = ((NO_SHUTDOWN == upd_proc_local->upd_proc_shutdown) && (SRV_DEAD == is_updproc_alive())
&& (NO_SHUTDOWN == upd_proc_local->upd_proc_shutdown)))
|| (info = (((NORMAL_SHUTDOWN == upd_proc_local->upd_proc_shutdown)
|| (ABNORMAL_SHUTDOWN == upd_proc_local->upd_proc_shutdown)) && (SRV_DEAD == is_updproc_alive()))))
{
if (alert)
repl_log(gtmrecv_log_fp, TRUE, TRUE,
"ALERT : Receiver Server detected that Update Process is not ALIVE\n");
else
repl_log(gtmrecv_log_fp, TRUE, TRUE,
"INFO : Update process not running due to user initiated shutdown\n");
if (1 == report_cnt)
{
send_xoff = TRUE;
recvpool_ctl->old_jnl_seqno = recvpool_ctl->jnl_seqno;
recvpool_ctl->jnl_seqno = 0;
/* Even though we have identified that the update process is NOT alive, a waitpid on the update
* process PID is necessary so that the system doesn't leave any zombie process lying around.
* This is possible since any child process that dies without the parent doing a waitpid on it
* will be defunct unless the parent dies at which point the "init" process takes the role of
* the parent and invokes waitpid to remove the zombies.
* NOTE: It is possible that the update process was killed before the receiver server got a
* chance to record it's PID in the recvpool.upd_proc_local structure. In such a case, don't
* invoke waitpid as that will block us (receiver server) if this instance of the receiver
* server was started with helper processes.
*/
if (0 < upd_proc_local->upd_proc_pid)
{
WAITPID(upd_proc_local->upd_proc_pid, &upd_exit_status, 0, waitpid_res);
/* Since the update process as part of its shutdown does NOT reset the upd_proc_pid, reset
* it here ONLY if the update process was NOT kill -9ed. This is needed because receiver
* server as part of its shutdown relies on this field (upd_proc_pid) to determine if the
* update process was cleanly shutdown or was kill -9ed.
*/
if (!alert)
upd_proc_local->upd_proc_pid = 0;
}
upd_proc_local->bad_trans = FALSE; /* No point in doing bad transaction processing */
upd_proc_local->onln_rlbk_flg = FALSE; /* No point handling online rollback */
}
gtmrecv_wait_for_jnl_seqno = TRUE;
REPL_DPRINT1(
"gtmrecv_poll_actions : Setting gtmrecv_wait_for_jnl_seqno to TRUE because of upd crash/shutdown\n");
next_report_at *= GTMRECV_NEXT_REPORT_FACTOR;
report_cnt++;
}
} else
report_cnt++;
/* Check if REPL_CMP2UNCMP or REPL_BADTRANS message needs to be sent */
if (upd_proc_local->onln_rlbk_flg)
{ /* Update process detected an online rollback and is requesting us to restart the connection. But before that, send
* REPL_XOFF source side and drain the replication pipe
*/
onln_rlbk_flg_set = TRUE;
send_xoff = TRUE;
} else if (!send_cmp2uncmp && gtmrecv_send_cmp2uncmp)
{
send_xoff = TRUE;
send_seqno = recvpool_ctl->jnl_seqno;
send_cmp2uncmp = TRUE;
} else if (!send_badtrans && upd_proc_local->bad_trans)
{
send_xoff = TRUE;
send_seqno = upd_proc_local->read_jnl_seqno;
send_badtrans = TRUE;
bad_trans_detected = TRUE;
} else if (!upd_proc_local->bad_trans && send_badtrans && 1 != report_cnt)
{
send_badtrans = FALSE;
bad_trans_detected = FALSE;
}
if (send_xoff && !xoff_sent)
{ /* Send XOFF_ACK_ME if the receiver has a connection to the source. Do not attempt to send it if we dont even
* know the endianness of the remote side. In that case, we are guaranteed no initial handshake occurred and
* so no point sending the XOFF too. This saves us lots of trouble in case of cross-endian replication connections.
*/
assert((FD_INVALID != gtmrecv_sock_fd) || repl_connection_reset);
if ((FD_INVALID != gtmrecv_sock_fd) && remote_side->endianness_known)
{
send_seqno = upd_proc_local->read_jnl_seqno;
if (!remote_side->cross_endian)
{
xoff_msg.type = REPL_XOFF_ACK_ME;
xoff_msg.len = MIN_REPL_MSGLEN;
memcpy((uchar_ptr_t)&xoff_msg.msg[0], (uchar_ptr_t)&send_seqno, SIZEOF(seq_num));
} else
{
xoff_msg.type = GTM_BYTESWAP_32(REPL_XOFF_ACK_ME);
xoff_msg.len = GTM_BYTESWAP_32(MIN_REPL_MSGLEN);
temp_send_seqno = GTM_BYTESWAP_64(send_seqno);
memcpy((uchar_ptr_t)&xoff_msg.msg[0], (uchar_ptr_t)&temp_send_seqno, SIZEOF(seq_num));
}
REPL_SEND_LOOP(gtmrecv_sock_fd, &xoff_msg, MIN_REPL_MSGLEN, REPL_POLL_NOWAIT)
; /* Empty Body */
if (SS_NORMAL != status)
{
if (REPL_CONN_RESET(status) && EREPL_SEND == repl_errno)
{
repl_log(gtmrecv_log_fp, TRUE, TRUE, "Connection reset while sending XOFF_ACK_ME. "
"Status = %d ; %s\n", status, STRERROR(status));
repl_close(>mrecv_sock_fd);
repl_connection_reset = TRUE;
xoff_sent = FALSE;
send_badtrans = FALSE;
} else if (EREPL_SEND == repl_errno)
rts_error_csa(CSA_ARG(NULL) VARLSTCNT(7) ERR_REPLCOMM, 0, ERR_TEXT, 2,
LEN_AND_LIT("Error sending XOFF msg due to BAD_TRANS or UPD crash/shutdown. "
"Error in send"), status);
else
{
assert(EREPL_SELECT == repl_errno);
rts_error_csa(CSA_ARG(NULL) VARLSTCNT(7) ERR_REPLCOMM, 0, ERR_TEXT, 2,
LEN_AND_LIT("Error sending XOFF msg due to BAD_TRANS or UPD crash/shutdown. "
"Error in select"), status);
}
} else
{
xoff_sent = TRUE;
log_draining_msg = TRUE;
}
repl_log(gtmrecv_log_fp, TRUE, TRUE, "REPL_XOFF_ACK_ME sent due to upd shutdown/crash or bad trans "
"or ONLINE_ROLLBACK\n");
send_xoff = FALSE;
} else
{ /* Connection has been lost OR initial handshake needs to happen again, so no point sending XOFF/BADTRANS */
send_xoff = FALSE;
send_badtrans = FALSE;
}
}
/* Drain pipe */
if (xoff_sent)
{
if (log_draining_msg)
{ /* avoid multiple logs per instance */
repl_log(gtmrecv_log_fp, TRUE, TRUE, "REPL INFO - Draining replication pipe due to %s\n",
send_cmp2uncmp ? "CMP2UNCMP" : (send_badtrans ? "BAD_TRANS" :
(onln_rlbk_flg_set ? "ONLINE_ROLLBACK" : "UPD shutdown/crash")));
log_draining_msg = FALSE;
}
if (0 != *buff_unprocessed)
{ /* Throw away the current contents of the buffer */
buffered_data_len = ((*pending_data_len <= *buff_unprocessed) ? *pending_data_len : *buff_unprocessed);
*buff_unprocessed -= buffered_data_len;
buffp += buffered_data_len;
*pending_data_len -= buffered_data_len;
REPL_DPRINT2("gtmrecv_poll_actions : (1) Throwing away %d bytes from old buffer while draining\n",
buffered_data_len);
assert(remote_side->endianness_known); /* only then is remote_side->cross_endian reliable */
while (REPL_MSG_HDRLEN <= *buff_unprocessed)
{
assert(0 == (((unsigned long)buffp) % REPL_MSG_ALIGN));
msg_len = ((repl_msg_ptr_t)buffp)->len;
msg_type = ((repl_msg_ptr_t)buffp)->type;
if (remote_side->cross_endian)
{
msg_len = GTM_BYTESWAP_32(msg_len);
msg_type = GTM_BYTESWAP_32(msg_type);
}
msg_type = (msg_type & REPL_TR_CMP_MSG_TYPE_MASK);
assert((REPL_TR_CMP_JNL_RECS == msg_type) || (0 == (msg_len % REPL_MSG_ALIGN)));
*pending_data_len = ROUND_UP2(msg_len, REPL_MSG_ALIGN);
buffered_data_len = ((*pending_data_len <= *buff_unprocessed) ?
*pending_data_len : *buff_unprocessed);
*buff_unprocessed -= buffered_data_len;
buffp += buffered_data_len;
*pending_data_len -= buffered_data_len;
REPL_DPRINT3("gtmrecv_poll_actions : (1) Throwing away message of "
"type %d and length %d from old buffer while draining\n", msg_type, buffered_data_len);
}
if (0 < *buff_unprocessed)
{
memmove((unsigned char *)gtmrecv_msgp, buffp, *buff_unprocessed);
REPL_DPRINT2("gtmrecv_poll_actions : Incomplete header of length %d while draining\n",
*buff_unprocessed);
}
}
status = SS_NORMAL;
if (0 != *buff_unprocessed || 0 == *pending_data_len)
{ /* Receive the header of a message */
assert(REPL_MSG_HDRLEN > *buff_unprocessed); /* so we dont pass negative length in REPL_RECV_LOOP */
REPL_RECV_LOOP(gtmrecv_sock_fd, ((unsigned char *)gtmrecv_msgp) + *buff_unprocessed,
(REPL_MSG_HDRLEN - *buff_unprocessed), REPL_POLL_WAIT)
; /* Empty Body */
if (SS_NORMAL == status)
{
assert(remote_side->endianness_known); /* only then is remote_side->cross_endian reliable */
if (!remote_side->cross_endian)
{
msg_len = gtmrecv_msgp->len;
msg_type = gtmrecv_msgp->type;
} else
{
msg_len = GTM_BYTESWAP_32(gtmrecv_msgp->len);
msg_type = GTM_BYTESWAP_32(gtmrecv_msgp->type);
}
msg_type = (msg_type & REPL_TR_CMP_MSG_TYPE_MASK);
assert((REPL_TR_CMP_JNL_RECS == msg_type) || (0 == (msg_len % REPL_MSG_ALIGN)));
msg_len = ROUND_UP2(msg_len, REPL_MSG_ALIGN);
REPL_DPRINT3("gtmrecv_poll_actions : Received message of type %d and length %d while draining\n",
msg_type, msg_len);
}
}
if ((SS_NORMAL == status) && (0 != *buff_unprocessed || 0 == *pending_data_len) && (REPL_XOFF_ACK == msg_type))
{ /* Receive the rest of the XOFF_ACK msg and signal the drain as complete */
REPL_RECV_LOOP(gtmrecv_sock_fd, gtmrecv_msgp, (MIN_REPL_MSGLEN - REPL_MSG_HDRLEN), REPL_POLL_WAIT)
; /* Empty Body */
if (SS_NORMAL == status)
{
repl_log(gtmrecv_log_fp, TRUE, TRUE,
"REPL INFO - XOFF_ACK received. Drained replication pipe completely\n");
upd_shut_too_early_logged = FALSE;
xoff_sent = FALSE;
return_status = STOP_POLL;
}
} else if (SS_NORMAL == status)
{ /* Drain the rest of the message */
if (0 < *pending_data_len)
{
pending_msg_size = *pending_data_len;
REPL_DPRINT2("gtmrecv_poll_actions : (2) Throwing away %d bytes from pipe\n", pending_msg_size);
} else
{
pending_msg_size = msg_len - REPL_MSG_HDRLEN;
REPL_DPRINT3("gtmrecv_poll_actions : (2) Throwing away message of "
"type %d and length %d from pipe\n", msg_type, msg_len);
}
for ( ; SS_NORMAL == status && 0 < pending_msg_size; pending_msg_size -= gtmrecv_max_repl_msglen)
{
temp_len = (pending_msg_size < gtmrecv_max_repl_msglen)? pending_msg_size : gtmrecv_max_repl_msglen;
REPL_RECV_LOOP(gtmrecv_sock_fd, gtmrecv_msgp, temp_len, REPL_POLL_WAIT)
; /* Empty Body */
}
*buff_unprocessed = 0; *pending_data_len = 0;
if (SS_NORMAL == status && info && !upd_shut_too_early_logged)
{
repl_log(gtmrecv_log_fp, TRUE, TRUE, "ALERT : User initiated shutdown of Update Process done "
"when there was data in the replication pipe\n");
upd_shut_too_early_logged = TRUE;
}
return_status = CONTINUE_POLL;
}
if (SS_NORMAL != status)
{
if (EREPL_RECV == repl_errno)
{
if (REPL_CONN_RESET(status))
{
repl_log(gtmrecv_log_fp, TRUE, TRUE, "Connection reset while receiving XOFF_ACK. "
"Status = %d ; %s\n", status, STRERROR(status));
repl_close(>mrecv_sock_fd);
repl_connection_reset = TRUE;
xoff_sent = FALSE;
send_badtrans = FALSE;
return_status = STOP_POLL;
} else
rts_error_csa(CSA_ARG(NULL) VARLSTCNT(7) ERR_REPLCOMM, 0, ERR_TEXT, 2,
LEN_AND_LIT("Error while draining replication pipe. Error in recv"), status);
} else
{
assert(EREPL_SELECT == repl_errno);
rts_error_csa(CSA_ARG(NULL) VARLSTCNT(7) ERR_REPLCOMM, 0, ERR_TEXT, 2,
LEN_AND_LIT("Error while draining replication pipe. Error in select"), status);
}
}
} else
return_status = STOP_POLL;
/* Like was done before for the XOFF_ACK_ME message, send a BADTRANS/CMP2UNCMP message only if we know
* the endianness of the other side. If not, no point in sending one anyways and saves us trouble in
* case of cross-endian replication connections.
*/
if ((STOP_POLL == return_status) && (send_badtrans || send_cmp2uncmp)
&& (FD_INVALID != gtmrecv_sock_fd) && remote_side->endianness_known)
{ /* Send REPL_BADTRANS or REPL_CMP2UNCMP message */
if (!remote_side->cross_endian)
{
bad_trans_msg.type = send_cmp2uncmp ? REPL_CMP2UNCMP : REPL_BADTRANS;
bad_trans_msg.len = MIN_REPL_MSGLEN;
bad_trans_msg.start_seqno = send_seqno;
} else
{
bad_trans_msg.type = send_cmp2uncmp ? GTM_BYTESWAP_32(REPL_CMP2UNCMP) : GTM_BYTESWAP_32(REPL_BADTRANS);
bad_trans_msg.len = GTM_BYTESWAP_32(MIN_REPL_MSGLEN);
bad_trans_msg.start_seqno = GTM_BYTESWAP_64(send_seqno);
}
REPL_SEND_LOOP(gtmrecv_sock_fd, &bad_trans_msg, bad_trans_msg.len, REPL_POLL_NOWAIT)
; /* Empty Body */
if (SS_NORMAL == status)
{
if (send_cmp2uncmp)
repl_log(gtmrecv_log_fp, TRUE, TRUE, "REPL_CMP2UNCMP message sent with seqno %llu\n", send_seqno);
else
repl_log(gtmrecv_log_fp, TRUE, TRUE, "REPL_BADTRANS message sent with seqno %llu\n", send_seqno);
} else
{
if (REPL_CONN_RESET(status) && EREPL_SEND == repl_errno)
{
if (send_cmp2uncmp)
{
repl_log(gtmrecv_log_fp, TRUE, TRUE, "Connection reset while sending REPL_CMP2UNCMP. "
"Status = %d ; %s\n", status, STRERROR(status));
} else
{
repl_log(gtmrecv_log_fp, TRUE, TRUE, "Connection reset while sending REPL_BADTRANS. "
"Status = %d ; %s\n", status, STRERROR(status));
}
repl_close(>mrecv_sock_fd);
repl_connection_reset = TRUE;
return_status = STOP_POLL;
} else if (EREPL_SEND == repl_errno)
rts_error_csa(CSA_ARG(NULL) VARLSTCNT(7) ERR_REPLCOMM, 0, ERR_TEXT, 2,
LEN_AND_LIT("Error sending REPL_BADTRANS/REPL_CMP2UNCMP. Error in send"), status);
else
{
assert(EREPL_SELECT == repl_errno);
rts_error_csa(CSA_ARG(NULL) VARLSTCNT(7) ERR_REPLCOMM, 0, ERR_TEXT, 2,
LEN_AND_LIT("Error sending REPL_BADTRANS/REPL_CMP2UNCMP. Error in select"), status);
}
}
send_badtrans = FALSE;
if (send_cmp2uncmp)
{
REPL_DPRINT1("gtmrecv_poll_actions : Setting gtmrecv_wait_for_jnl_seqno to TRUE because this receiver"
"server requested a fall-back from compressed to uncompressed operation\n");
gtmrecv_wait_for_jnl_seqno = TRUE;/* set this to TRUE to break out and go back to a fresh "do_main_loop" */
gtmrecv_bad_trans_sent = TRUE;
gtmrecv_send_cmp2uncmp = FALSE;
send_cmp2uncmp = FALSE;
}
}
if ((upd_proc_local->bad_trans && bad_trans_detected) || onln_rlbk_flg_set
|| (UPDPROC_START == upd_proc_local->start_upd) && (1 != report_cnt))
{
if (UPDPROC_START == upd_proc_local->start_upd)
{
assert(is_updproc_alive() != SRV_ALIVE);
upd_proc_local->upd_proc_shutdown = NO_SHUTDOWN;
}
recvpool_ctl->wrapped = FALSE;
recvpool_ctl->write_wrap = recvpool_ctl->recvpool_size;
recvpool_ctl->write = 0;
/* Reset last_rcvd_histinfo, last_valid_histinfo etc. as they reflect context from unprocessed data
* in the receive pool and those are no longer valid because we have drained the receive pool.
*/
GTMRECV_CLEAR_CACHED_HISTINFO(recvpool.recvpool_ctl, jnlpool, jnlpool_ctl, INSERT_STRM_HISTINFO_FALSE);
if (UPDPROC_START == upd_proc_local->start_upd)
{
/* Attempt starting the update process */
for (upd_start_attempts = 0;
UPDPROC_START_ERR == (upd_start_status = gtmrecv_upd_proc_init(FALSE)) &&
GTMRECV_MAX_UPDSTART_ATTEMPTS > upd_start_attempts;
upd_start_attempts++)
{
if (EREPL_UPDSTART_SEMCTL == repl_errno || EREPL_UPDSTART_BADPATH == repl_errno)
{
gtmrecv_autoshutdown();
} else if (EREPL_UPDSTART_FORK == repl_errno)
{
/* Couldn't start up update now, can try later */
LONG_SLEEP(GTMRECV_WAIT_FOR_PROC_SLOTS);
continue;
} else if (EREPL_UPDSTART_EXEC == repl_errno)
{
/* In forked child, could not exec, should exit */
gtmrecv_exit(ABNORMAL_SHUTDOWN);
}
}
if (UPDPROC_STARTED == (upd_proc_local->start_upd = upd_start_status))
{
REPL_DPRINT1("gtmrecv_poll_actions : Setting gtmrecv_wait_for_jnl_seqno to TRUE because of "
"upd restart\n");
gtmrecv_wait_for_jnl_seqno = TRUE;
report_cnt = next_report_at = 1;
if (send_xoff && (FD_INVALID == gtmrecv_sock_fd))
{
/* Update start command was issued before connection was established,
* no point in sending XOFF. */
send_xoff = FALSE;
}
} else
{
repl_log(gtmrecv_log_fp, TRUE, TRUE, "%d failed attempts to fork update process. Try later\n",
upd_start_attempts);
}
} else
{
gtmrecv_wait_for_jnl_seqno = TRUE;/* set this to TRUE to break out and go back to a fresh "do_main_loop" */
if (onln_rlbk_flg_set)
{
assert(NULL != jnlpool_ctl);
repl_log(gtmrecv_log_fp, TRUE, TRUE, "Closing connection due to ONLINE ROLLBACK\n");
repl_log(gtmrecv_log_fp, TRUE, TRUE, "REPL INFO - Current Jnlpool Seqno : %llu\n",
jnlpool_ctl->jnl_seqno);
repl_log(gtmrecv_log_fp, TRUE, TRUE, "REPL INFO - Current Receive Pool Seqno : %llu\n",
recvpool_ctl->jnl_seqno);
repl_close(>mrecv_sock_fd);
repl_connection_reset = TRUE;
xoff_sent = FALSE;
send_badtrans = FALSE;
upd_proc_local->onln_rlbk_flg = FALSE;
/* Before restarting afresh, sync the online rollback cycles. This way any future grab_lock that
* we do after restarting should not realize an unhandled online rollback. For receiver, it is
* just syncing the journal pool cycles as the databases are not opened. But, to be safe, grab
* the lock and sync the cycles.
*/
grab_lock(jnlpool.jnlpool_dummy_reg, TRUE, GRAB_LOCK_ONLY);
SYNC_ONLN_RLBK_CYCLES;
rel_lock(jnlpool.jnlpool_dummy_reg);
return_status = STOP_POLL;
recvpool_ctl->jnl_seqno = 0;
} else
{
REPL_DPRINT1("gtmrecv_poll_actions : Setting gtmrecv_wait_for_jnl_seqno to TRUE because bad trans"
"sent\n");
gtmrecv_bad_trans_sent = TRUE;
upd_proc_local->bad_trans = FALSE;
recvpool_ctl->jnl_seqno = upd_proc_local->read_jnl_seqno;
}
}
}
if ((0 == *pending_data_len) && (0 != gtmrecv_local->changelog))
{
if (gtmrecv_local->changelog & REPLIC_CHANGE_LOGINTERVAL)
{
repl_log(gtmrecv_log_fp, TRUE, TRUE, "Changing log interval from %u to %u\n",
log_interval, gtmrecv_local->log_interval);
log_interval = gtmrecv_local->log_interval;
gtmrecv_reinit_logseqno(); /* will force a LOG on the first recv following the interval change */
}
if (gtmrecv_local->changelog & REPLIC_CHANGE_LOGFILE)
{
repl_log(gtmrecv_log_fp, TRUE, TRUE, "Changing log file to %s\n", gtmrecv_local->log_file);
repl_log_init(REPL_GENERAL_LOG, >mrecv_log_fd, gtmrecv_local->log_file);
repl_log_fd2fp(>mrecv_log_fp, gtmrecv_log_fd);
repl_log(gtmrecv_log_fp, TRUE, TRUE, "Change log to %s successful\n",gtmrecv_local->log_file);
}
/* NOTE: update process and receiver each ignore any setting specific to the other (REPLIC_CHANGE_UPD_LOGINTERVAL,
* REPLIC_CHANGE_LOGINTERVAL) */
if (REPLIC_CHANGE_LOGINTERVAL == gtmrecv_local->changelog)
upd_proc_local->changelog = 0;
else
upd_proc_local->changelog = gtmrecv_local->changelog; /* Pass changelog request to the update process */
gtmrecv_local->changelog = 0;
}
if (0 == *pending_data_len && !gtmrecv_logstats && gtmrecv_local->statslog)
{
gtmrecv_logstats = TRUE;
repl_log(gtmrecv_log_fp, TRUE, TRUE, "Begin statistics logging\n");
} else if (0 == *pending_data_len && gtmrecv_logstats && !gtmrecv_local->statslog)
{
gtmrecv_logstats = FALSE;
/* Force all data out to the file before closing the file */
repl_log(gtmrecv_log_fp, TRUE, TRUE, "End statistics logging\n");
}
if (0 == *pending_data_len)
{
if (upd_helper_ctl->start_helpers)
{
gtmrecv_helpers_init(upd_helper_ctl->start_n_readers, upd_helper_ctl->start_n_writers);
upd_helper_ctl->start_helpers = FALSE;
}
if (HELPER_REAP_NONE != (status = upd_helper_ctl->reap_helpers) ||
(double)GTMRECV_REAP_HELPERS_INTERVAL <= difftime(gtmrecv_now, last_reap_time))
{
gtmrecv_reap_helpers(HELPER_REAP_WAIT == status);
last_reap_time = gtmrecv_now;
}
}
return (return_status);
}
int gtmsource()
{
int status, log_init_status, waitpid_res, save_errno;
char print_msg[1024], tmpmsg[1024];
gd_region *reg, *region_top;
sgmnt_addrs *csa, *repl_csa;
boolean_t all_files_open, isalive;
pid_t pid, ppid, procgp;
seq_num read_jnl_seqno, jnl_seqno;
unix_db_info *udi;
gtmsource_local_ptr_t gtmsource_local;
boolean_t this_side_std_null_coll;
int null_fd, rc;
memset((uchar_ptr_t)&jnlpool, 0, SIZEOF(jnlpool_addrs));
call_on_signal = gtmsource_sigstop;
ESTABLISH_RET(gtmsource_ch, SS_NORMAL);
if (-1 == gtmsource_get_opt())
rts_error_csa(CSA_ARG(NULL) VARLSTCNT(1) ERR_MUPCLIERR);
if (gtmsource_options.shut_down)
{ /* Wait till shutdown time nears even before going to "jnlpool_init". This is because the latter will return
* with the ftok semaphore and access semaphore held and we do not want to be holding those locks (while
* waiting for the user specified timeout to expire) as that will affect new GTM processes and/or other
* MUPIP REPLIC commands that need these locks for their function.
*/
if (0 < gtmsource_options.shutdown_time)
{
repl_log(stdout, TRUE, TRUE, "Waiting for %d seconds before signalling shutdown\n",
gtmsource_options.shutdown_time);
LONG_SLEEP(gtmsource_options.shutdown_time);
} else
repl_log(stdout, TRUE, TRUE, "Signalling shutdown immediate\n");
} else if (gtmsource_options.start)
{
repl_log(stdout, TRUE, TRUE, "Initiating START of source server for secondary instance [%s]\n",
gtmsource_options.secondary_instname);
}
if (gtmsource_options.activate && (ROOTPRIMARY_SPECIFIED == gtmsource_options.rootprimary))
{ /* MUPIP REPLIC -SOURCE -ACTIVATE -UPDOK has been specified. We need to open the gld and db regions now
* in case this is a secondary -> primary transition. This is so we can later switch journal files in all
* journaled regions when the transition actually happens inside "gtmsource_rootprimary_init". But since
* we have not yet done a "jnlpool_init", we dont know if updates are disabled in it or not. Although we
* need to do the gld/db open only if updates are currently disabled in the jnlpool, we do this always
* because once we do a jnlpool_init, we will come back with the ftok on the jnlpool held and that has
* issues with later db open since we will try to hold the db ftok as part of db open and the ftok logic
* currently has assumptions that a process holds only one ftok at any point in time.
*/
assert(NULL == gd_header);
gvinit();
all_files_open = region_init(FALSE);
if (!all_files_open)
{
gtm_putmsg_csa(CSA_ARG(NULL) VARLSTCNT(1) ERR_NOTALLDBOPN);
gtmsource_exit(ABNORMAL_SHUTDOWN);
}
}
jnlpool_init(GTMSOURCE, gtmsource_options.start, &is_jnlpool_creator);
/* is_jnlpool_creator == TRUE ==> this process created the journal pool
* is_jnlpool_creator == FALSE ==> journal pool already existed and this process simply attached to it.
*/
if (gtmsource_options.shut_down)
gtmsource_exit(gtmsource_shutdown(FALSE, NORMAL_SHUTDOWN) - NORMAL_SHUTDOWN);
else if (gtmsource_options.activate)
gtmsource_exit(gtmsource_mode_change(GTMSOURCE_MODE_ACTIVE_REQUESTED) - NORMAL_SHUTDOWN);
else if (gtmsource_options.deactivate)
gtmsource_exit(gtmsource_mode_change(GTMSOURCE_MODE_PASSIVE_REQUESTED) - NORMAL_SHUTDOWN);
else if (gtmsource_options.checkhealth)
gtmsource_exit(gtmsource_checkhealth() - NORMAL_SHUTDOWN);
else if (gtmsource_options.changelog)
gtmsource_exit(gtmsource_changelog() - NORMAL_SHUTDOWN);
else if (gtmsource_options.showbacklog)
gtmsource_exit(gtmsource_showbacklog() - NORMAL_SHUTDOWN);
else if (gtmsource_options.stopsourcefilter)
gtmsource_exit(gtmsource_stopfilter() - NORMAL_SHUTDOWN);
else if (gtmsource_options.jnlpool)
gtmsource_exit(gtmsource_jnlpool() - NORMAL_SHUTDOWN);
else if (gtmsource_options.losttncomplete)
gtmsource_exit(gtmsource_losttncomplete() - NORMAL_SHUTDOWN);
else if (gtmsource_options.needrestart)
gtmsource_exit(gtmsource_needrestart() - NORMAL_SHUTDOWN);
else if (gtmsource_options.showfreeze)
gtmsource_exit(gtmsource_showfreeze() - NORMAL_SHUTDOWN);
else if (gtmsource_options.setfreeze)
gtmsource_exit(gtmsource_setfreeze() - NORMAL_SHUTDOWN);
else if (!gtmsource_options.start)
{
assert(CLI_PRESENT == cli_present("STATSLOG"));
gtmsource_exit(gtmsource_statslog() - NORMAL_SHUTDOWN);
}
assert(gtmsource_options.start);
# ifndef REPL_DEBUG_NOBACKGROUND
/* Set "child_server_running" to FALSE before forking off child. Wait for it to be set to TRUE by the child. */
gtmsource_local = jnlpool.gtmsource_local;
gtmsource_local->child_server_running = FALSE;
FORK(pid);
if (0 > pid)
{
save_errno = errno;
rts_error_csa(CSA_ARG(NULL) VARLSTCNT(7) ERR_JNLPOOLSETUP, 0,
ERR_TEXT, 2, RTS_ERROR_LITERAL("Could not fork source server"), save_errno);
} else if (0 < pid)
{ /* Parent. Wait until child sets "child_server_running" to FALSE. That is an indication that the child
* source server has completed its initialization phase and is all set so the parent command can return.
*/
while (isalive = is_proc_alive(pid, 0)) /* note : intended assignment */
{
if (gtmsource_local->child_server_running)
break;
/* To take care of reassignment of PIDs, the while condition should be && with the condition
* (PPID of pid == process_id)
*/
SHORT_SLEEP(GTMSOURCE_WAIT_FOR_SRV_START);
WAITPID(pid, &status, WNOHANG, waitpid_res); /* Release defunct child if dead */
}
if (isalive)
{ /* Child process is alive and started with no issues */
if (0 != (save_errno = rel_sem(SOURCE, JNL_POOL_ACCESS_SEM)))
rts_error_csa(CSA_ARG(NULL) VARLSTCNT(7) ERR_JNLPOOLSETUP, 0,
ERR_TEXT, 2, RTS_ERROR_LITERAL("Error in rel_sem"), save_errno);
ftok_sem_release(jnlpool.jnlpool_dummy_reg, TRUE, TRUE);
} else
{ /* Child source server process errored out at startup and is no longer alive.
* If we were the one who created the journal pool, let us clean it up.
*/
repl_log(stdout, TRUE, TRUE, "Source server startup failed. See source server log file\n");
if (is_jnlpool_creator)
status = gtmsource_shutdown(TRUE, NORMAL_SHUTDOWN);
}
/* If the parent is killed (or crashes) between the fork and exit, checkhealth may not detect that startup
* is in progress - parent forks and dies, the system will release sem 0 and 1, checkhealth might test the
* value of sem 1 before the child grabs sem 1.
*/
gtmsource_exit(isalive ? SRV_ALIVE : SRV_ERR);
}
/* Point stdin to /dev/null */
OPENFILE("/dev/null", O_RDONLY, null_fd);
if (0 > null_fd)
rts_error_csa(CSA_ARG(NULL) ERR_REPLERR, RTS_ERROR_LITERAL("Failed to open /dev/null for read"), errno, 0);
FCNTL3(null_fd, F_DUPFD, 0, rc);
if (0 > rc)
rts_error_csa(CSA_ARG(NULL) ERR_REPLERR, RTS_ERROR_LITERAL("Failed to set stdin to /dev/null"), errno, 0);
CLOSEFILE(null_fd, rc);
if (0 > rc)
rts_error_csa(CSA_ARG(NULL) ERR_REPLERR, RTS_ERROR_LITERAL("Failed to close /dev/null"), errno, 0);
/* The parent process (source server startup command) will be holding the ftok semaphore and jnlpool access semaphore
* at this point. The variables that indicate this would have been copied over to the child during the fork. This will
* make the child think it is actually holding them as well when actually it is not. Reset those variables in the child
* to ensure they do not misrepresent the holder of those semaphores.
*/
ftok_sem_reg = NULL;
udi = FILE_INFO(jnlpool.jnlpool_dummy_reg);
assert(udi->grabbed_ftok_sem);
udi->grabbed_ftok_sem = FALSE;
assert(holds_sem[SOURCE][JNL_POOL_ACCESS_SEM]);
holds_sem[SOURCE][JNL_POOL_ACCESS_SEM] = FALSE;
assert(!holds_sem[SOURCE][SRC_SERV_COUNT_SEM]);
/* Start child source server initialization */
is_src_server = TRUE;
OPERATOR_LOG_MSG;
process_id = getpid();
/* Reinvoke secshr related initialization with the child's pid */
INVOKE_INIT_SECSHR_ADDRS;
/* Initialize mutex socket, memory semaphore etc. before any "grab_lock" is done by this process on the journal pool.
* Note that the initialization would already have been done by the parent receiver startup command but we need to
* redo the initialization with the child process id.
*/
assert(mutex_per_process_init_pid && (mutex_per_process_init_pid != process_id));
mutex_per_process_init();
START_HEARTBEAT_IF_NEEDED;
ppid = getppid();
log_init_status = repl_log_init(REPL_GENERAL_LOG, >msource_log_fd, gtmsource_options.log_file);
assert(SS_NORMAL == log_init_status);
repl_log_fd2fp(>msource_log_fp, gtmsource_log_fd);
if (-1 == (procgp = setsid()))
send_msg_csa(CSA_ARG(NULL) VARLSTCNT(7) ERR_JNLPOOLSETUP, 0, ERR_TEXT, 2,
RTS_ERROR_LITERAL("Source server error in setsid"), errno);
# endif /* REPL_DEBUG_NOBACKGROUND */
if (ZLIB_CMPLVL_NONE != gtm_zlib_cmp_level)
gtm_zlib_init(); /* Open zlib shared library for compression/decompression */
REPL_DPRINT1("Setting up regions\n");
gvinit();
/* We use the same code dse uses to open all regions but we must make sure they are all open before proceeding. */
all_files_open = region_init(FALSE);
if (!all_files_open)
{
gtm_putmsg_csa(CSA_ARG(NULL) VARLSTCNT(1) ERR_NOTALLDBOPN);
gtmsource_exit(ABNORMAL_SHUTDOWN);
}
/* Determine primary side null subscripts collation order */
/* Also check whether all regions have same null collation order */
this_side_std_null_coll = -1;
for (reg = gd_header->regions, region_top = gd_header->regions + gd_header->n_regions; reg < region_top; reg++)
{
csa = &FILE_INFO(reg)->s_addrs;
if (this_side_std_null_coll != csa->hdr->std_null_coll)
{
if (-1 == this_side_std_null_coll)
this_side_std_null_coll = csa->hdr->std_null_coll;
else
{
gtm_putmsg_csa(CSA_ARG(NULL) VARLSTCNT(1) ERR_NULLCOLLDIFF);
gtmsource_exit(ABNORMAL_SHUTDOWN);
}
}
if (!REPL_ALLOWED(csa) && JNL_ALLOWED(csa))
{
gtm_putmsg_csa(CSA_ARG(NULL) VARLSTCNT(4) ERR_REPLOFFJNLON, 2, DB_LEN_STR(reg));
gtmsource_exit(ABNORMAL_SHUTDOWN);
}
if (reg->read_only && REPL_ALLOWED(csa))
{
gtm_putmsg_csa(CSA_ARG(NULL) VARLSTCNT(6) ERR_JNLPOOLSETUP, 0, ERR_TEXT, 2,
RTS_ERROR_LITERAL("Source Server does not have write permissions to one or "
"more database files that are replicated"));
gtmsource_exit(ABNORMAL_SHUTDOWN);
}
}
/* Initialize source server alive/dead state related fields in "gtmsource_local" before the ftok semaphore is released */
gtmsource_local->gtmsource_pid = process_id;
gtmsource_local->gtmsource_state = GTMSOURCE_START;
if (is_jnlpool_creator)
{
DEBUG_ONLY(jnlpool.jnlpool_ctl->jnlpool_creator_pid = process_id);
gtmsource_seqno_init(this_side_std_null_coll);
if (ROOTPRIMARY_SPECIFIED == gtmsource_options.rootprimary)
{ /* Created the journal pool as a root primary. Append a history record to the replication instance file.
* Invoke the function "gtmsource_rootprimary_init" to do that.
*/
gtmsource_rootprimary_init(jnlpool.jnlpool_ctl->jnl_seqno);
}
}
/* after this point we can no longer have the case where all the regions are unreplicated/non-journaled. */
# ifndef REPL_DEBUG_NOBACKGROUND
/* It is necessary for every process that is using the ftok semaphore to increment the counter by 1. This is used
* by the last process that shuts down to delete the ftok semaphore when it notices the counter to be 0.
* Note that the parent source server startup command would have done an increment of the ftok counter semaphore
* for the replication instance file. But the source server process (the child) that comes here would not have done
* that. Do that while the parent is still holding on to the ftok semaphore waiting for our okay.
*/
if (!ftok_sem_incrcnt(jnlpool.jnlpool_dummy_reg))
rts_error_csa(CSA_ARG(NULL) VARLSTCNT(1) ERR_JNLPOOLSETUP);
/* Increment the source server count semaphore */
status = incr_sem(SOURCE, SRC_SERV_COUNT_SEM);
if (0 != status)
{
save_errno = errno;
rts_error_csa(CSA_ARG(NULL) VARLSTCNT(7) ERR_JNLPOOLSETUP, 0, ERR_TEXT, 2,
RTS_ERROR_LITERAL("Counter semaphore increment failure in child source server"), save_errno);
}
# else
if (0 != (save_errno = rel_sem_immediate(SOURCE, JNL_POOL_ACCESS_SEM)))
{
rts_error_csa(CSA_ARG(NULL) VARLSTCNT(7) ERR_JNLPOOLSETUP, 0, ERR_TEXT, 2,
RTS_ERROR_LITERAL("Error in rel_sem_immediate"), save_errno);
}
# endif /* REPL_DEBUG_NOBACKGROUND */
gtmsource_srv_count++;
gtmsource_local->child_server_running = TRUE; /* At this point, the parent startup command will stop waiting for child */
gtm_event_log_init();
/* Log source server startup command line first */
SPRINTF(tmpmsg, "%s %s\n", cli_lex_in_ptr->argv[0], cli_lex_in_ptr->in_str);
repl_log(gtmsource_log_fp, TRUE, TRUE, tmpmsg);
SPRINTF(tmpmsg, "GTM Replication Source Server with Pid [%d] started for Secondary Instance [%s]",
process_id, gtmsource_local->secondary_instname);
sgtm_putmsg(print_msg, VARLSTCNT(4) ERR_REPLINFO, 2, LEN_AND_STR(tmpmsg));
repl_log(gtmsource_log_fp, TRUE, TRUE, print_msg);
if (is_jnlpool_creator)
{
repl_log(gtmsource_log_fp, TRUE, TRUE, "Created jnlpool with shmid = [%d] and semid = [%d]\n",
jnlpool.repl_inst_filehdr->jnlpool_shmid, jnlpool.repl_inst_filehdr->jnlpool_semid);
} else
repl_log(gtmsource_log_fp, TRUE, TRUE, "Attached to existing jnlpool with shmid = [%d] and semid = [%d]\n",
jnlpool.repl_inst_filehdr->jnlpool_shmid, jnlpool.repl_inst_filehdr->jnlpool_semid);
gtm_event_log(GTM_EVENT_LOG_ARGC, "MUPIP", "REPLINFO", print_msg);
# ifdef GTM_TLS
if (REPL_TLS_REQUESTED)
{
repl_do_tls_init(gtmsource_log_fp);
assert(REPL_TLS_REQUESTED || PLAINTEXT_FALLBACK);
}
# endif
if (jnlpool.jnlpool_ctl->freeze)
{
last_seen_freeze_flag = jnlpool.jnlpool_ctl->freeze;
sgtm_putmsg(print_msg, VARLSTCNT(3) ERR_REPLINSTFROZEN, 1, jnlpool.repl_inst_filehdr->inst_info.this_instname);
repl_log(gtmsource_log_fp, TRUE, FALSE, print_msg);
sgtm_putmsg(print_msg, VARLSTCNT(3) ERR_REPLINSTFREEZECOMMENT, 1, jnlpool.jnlpool_ctl->freeze_comment);
repl_log(gtmsource_log_fp, TRUE, TRUE, print_msg);
}
gtmsource_local->jnlfileonly = gtmsource_options.jnlfileonly;
do
{ /* If mode is passive, go to sleep. Wakeup every now and then and check to see if I have to become active. */
gtmsource_state = gtmsource_local->gtmsource_state = GTMSOURCE_START;
if ((gtmsource_local->mode == GTMSOURCE_MODE_PASSIVE) && (gtmsource_local->shutdown == NO_SHUTDOWN))
{
gtmsource_poll_actions(FALSE);
SHORT_SLEEP(GTMSOURCE_WAIT_FOR_MODE_CHANGE);
continue;
}
if (GTMSOURCE_MODE_PASSIVE == gtmsource_local->mode)
{ /* Shutdown initiated */
assert(gtmsource_local->shutdown == SHUTDOWN);
sgtm_putmsg(print_msg, VARLSTCNT(4) ERR_REPLINFO, 2,
RTS_ERROR_LITERAL("GTM Replication Source Server Shutdown signalled"));
repl_log(gtmsource_log_fp, TRUE, TRUE, print_msg);
gtm_event_log(GTM_EVENT_LOG_ARGC, "MUPIP", "REPLINFO", print_msg);
break;
}
gtmsource_poll_actions(FALSE);
if (GTMSOURCE_CHANGING_MODE == gtmsource_state)
continue;
if (GTMSOURCE_MODE_ACTIVE_REQUESTED == gtmsource_local->mode)
gtmsource_local->mode = GTMSOURCE_MODE_ACTIVE;
SPRINTF(tmpmsg, "GTM Replication Source Server now in ACTIVE mode using port %d", gtmsource_local->secondary_port);
sgtm_putmsg(print_msg, VARLSTCNT(4) ERR_REPLINFO, 2, LEN_AND_STR(tmpmsg));
repl_log(gtmsource_log_fp, TRUE, TRUE, print_msg);
gtm_event_log(GTM_EVENT_LOG_ARGC, "MUPIP", "REPLINFO", print_msg);
DEBUG_ONLY(repl_csa = &FILE_INFO(jnlpool.jnlpool_dummy_reg)->s_addrs;)
assert(!repl_csa->hold_onto_crit); /* so it is ok to invoke "grab_lock" and "rel_lock" unconditionally */
grab_lock(jnlpool.jnlpool_dummy_reg, TRUE, HANDLE_CONCUR_ONLINE_ROLLBACK);
if (GTMSOURCE_HANDLE_ONLN_RLBK == gtmsource_state)
{
repl_log(gtmsource_log_fp, TRUE, TRUE, "Starting afresh due to ONLINE ROLLBACK\n");
repl_log(gtmsource_log_fp, TRUE, TRUE, "REPL INFO - Current Jnlpool Seqno : %llu\n",
jnlpool.jnlpool_ctl->jnl_seqno);
continue;
}
QWASSIGN(gtmsource_local->read_addr, jnlpool.jnlpool_ctl->write_addr);
gtmsource_local->read = jnlpool.jnlpool_ctl->write;
gtmsource_local->read_state = gtmsource_local->jnlfileonly ? READ_FILE : READ_POOL;
read_jnl_seqno = gtmsource_local->read_jnl_seqno;
assert(read_jnl_seqno <= jnlpool.jnlpool_ctl->jnl_seqno);
if (read_jnl_seqno < jnlpool.jnlpool_ctl->jnl_seqno)
{
gtmsource_local->read_state = READ_FILE;
QWASSIGN(gtmsource_save_read_jnl_seqno, jnlpool.jnlpool_ctl->jnl_seqno);
gtmsource_pool2file_transition = TRUE; /* so that we read the latest gener jnl files */
}
rel_lock(jnlpool.jnlpool_dummy_reg);
if (SS_NORMAL != (status = gtmsource_alloc_tcombuff()))
rts_error_csa(CSA_ARG(NULL) VARLSTCNT(7) ERR_REPLCOMM, 0, ERR_TEXT, 2,
RTS_ERROR_LITERAL("Error allocating initial tcom buffer space. Malloc error"), status);
gtmsource_filter = NO_FILTER;
if ('\0' != gtmsource_local->filter_cmd[0])
{
if (SS_NORMAL == (status = repl_filter_init(gtmsource_local->filter_cmd)))
gtmsource_filter |= EXTERNAL_FILTER;
else
gtmsource_exit(ABNORMAL_SHUTDOWN);
}
gtmsource_process();
/* gtmsource_process returns only when mode needs to be changed to PASSIVE */
assert(gtmsource_state == GTMSOURCE_CHANGING_MODE);
gtmsource_ctl_close();
gtmsource_free_msgbuff();
gtmsource_free_tcombuff();
gtmsource_free_filter_buff();
gtmsource_stop_heartbeat();
if (FD_INVALID != gtmsource_sock_fd)
repl_close(>msource_sock_fd);
if (gtmsource_filter & EXTERNAL_FILTER)
repl_stop_filter();
} while (TRUE);
