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/****************************************************************
* *
* Copyright (c) 2006-2021 Fidelity National Information *
* Services, Inc. and/or its subsidiaries. All rights reserved. *
* *
* This source code contains the intellectual property *
* of its copyright holder(s), and is made available *
* under a license. If you do not know the terms of *
* the license, please stop and do not read further. *
* *
****************************************************************/
#include "mdef.h"
#include "gtm_string.h"
#include "gtm_stdio.h"
#if !defined(__MVS__) && !defined(VMS)
#include <sys/param.h>
#endif
#include <sys/time.h>
#include "gtm_inet.h"
#include <errno.h>
#ifdef VMS
#include <descrip.h> /* Required for gtmsource.h */
#endif
#include "error.h"
#include "gdsroot.h"
#include "gdsblk.h"
#include "gtm_facility.h"
#include "fileinfo.h"
#include "gdsbt.h"
#include "gdsfhead.h"
#include "filestruct.h"
#include "repl_msg.h"
#include "gtmsource.h"
#include "repl_dbg.h"
#include "repl_shutdcode.h"
#include "repl_sem.h"
#include "util.h"
#include "repl_log.h"
#include "is_proc_alive.h"
#include "min_max.h"
GBLREF jnlpool_addrs_ptr_t jnlpool;
GBLREF gtmsource_options_t gtmsource_options;
GBLREF boolean_t holds_sem[NUM_SEM_SETS][NUM_SRC_SEMS];
error_def(ERR_LASTTRANS);
error_def(ERR_SRCSRVNOTEXIST);
error_def(ERR_SRCBACKLOGSTATUS);
int gtmsource_showbacklog(void)
{
seq_num heartbeat_jnl_seqno, jnl_seqno, read_jnl_seqno, src_backlog;
gtmsource_local_ptr_t gtmsourcelocal_ptr;
char * lasttrans[] = {"posted ","sent ","acknowledged "};
char * syncstate[] = {"is behind by", "has not acknowledged", "is ahead by"};
int4 index, syncstateindex = 0;
boolean_t srv_alive;
assert(holds_sem[SOURCE][JNL_POOL_ACCESS_SEM]);
if (NULL != jnlpool->gtmsource_local) /* Show backlog for a specific source server */
gtmsourcelocal_ptr = jnlpool->gtmsource_local;
else
gtmsourcelocal_ptr = &jnlpool->gtmsource_local_array[0];
for (index = 0; index < NUM_GTMSRC_LCL; index++, gtmsourcelocal_ptr++)
{
if ('\0' == gtmsourcelocal_ptr->secondary_instname[0])
{
assert(NULL == jnlpool->gtmsource_local);
continue;
}
/* If SHOWBACKLOG on a specific secondary instance is requested, print the backlog information irrespective
* of whether a source server for that instance is alive or not. For SHOWBACKLOG on ALL secondary instances
* print backlog information only for those instances that have an active or passive source server alive.
*/
heartbeat_jnl_seqno = gtmsourcelocal_ptr->heartbeat_jnl_seqno;
if ((NULL == jnlpool->gtmsource_local) && (0 == gtmsourcelocal_ptr->gtmsource_pid))
continue;
repl_log(stderr, TRUE, TRUE,
"Initiating SHOWBACKLOG operation on source server pid [%d] for secondary instance [%s]\n",
gtmsourcelocal_ptr->gtmsource_pid, gtmsourcelocal_ptr->secondary_instname);
/* jnlpool->jnlpool_ctl->jnl_seqno >= gtmsourcelocal_ptr->read_jnl_seqno is the most common case;
* see gtmsource_readpool() for when the rare case can occur
* Within a Source Server, jnlpool->jnlpool_ctl->jnl_seqno and gtmsourcelocal_ptr->read_jnl_seqno
* counters start with 1 and cannot be 0 or less. heartbeat_jnl_seqno is 0 whenever the Source Server
* restarts or we have an empty database.
* Use local variables for arithmetic computation to prevent adjustments to the memory structure.
*/
if (0 < jnlpool->jnlpool_ctl->jnl_seqno)
jnl_seqno = jnlpool->jnlpool_ctl->jnl_seqno - 1;
gtm_putmsg_csa(CSA_ARG(NULL) VARLSTCNT(5) ERR_LASTTRANS, 3, LEN_AND_STR(lasttrans[0]), &jnl_seqno);
if (0 < gtmsourcelocal_ptr->read_jnl_seqno)
read_jnl_seqno = gtmsourcelocal_ptr->read_jnl_seqno - 1;
gtm_putmsg_csa(CSA_ARG(NULL) VARLSTCNT(5) ERR_LASTTRANS, 3, LEN_AND_STR(lasttrans[1]), &read_jnl_seqno);
if (0 != heartbeat_jnl_seqno)
heartbeat_jnl_seqno--;
assert(0 <= heartbeat_jnl_seqno);
gtm_putmsg_csa(CSA_ARG(NULL) VARLSTCNT(5) ERR_LASTTRANS, 3, LEN_AND_STR(lasttrans[2]), &heartbeat_jnl_seqno);
src_backlog = MAX(jnl_seqno, read_jnl_seqno) - heartbeat_jnl_seqno;
if (0 == heartbeat_jnl_seqno)
syncstateindex = 1;
if (heartbeat_jnl_seqno > MIN(jnl_seqno, read_jnl_seqno))
{
src_backlog = heartbeat_jnl_seqno - MIN(jnl_seqno, read_jnl_seqno);
syncstateindex = 2;
}
gtm_putmsg_csa(CSA_ARG(NULL) VARLSTCNT(7) ERR_SRCBACKLOGSTATUS, 5,
LEN_AND_STR(gtmsourcelocal_ptr->secondary_instname),
LEN_AND_STR(syncstate[syncstateindex]), &src_backlog);
srv_alive = (0 == gtmsourcelocal_ptr->gtmsource_pid) ? FALSE : is_proc_alive(gtmsourcelocal_ptr->gtmsource_pid, 0);
if (!srv_alive)
gtm_putmsg_csa(CSA_ARG(NULL) VARLSTCNT(4) MAKE_MSG_WARNING(ERR_SRCSRVNOTEXIST), 2,
LEN_AND_STR(gtmsourcelocal_ptr->secondary_instname));
else if ((gtmsourcelocal_ptr->mode == GTMSOURCE_MODE_PASSIVE)
|| (gtmsourcelocal_ptr->mode == GTMSOURCE_MODE_ACTIVE_REQUESTED))
util_out_print("WARNING - Source Server is in passive mode, transactions are not being replicated", TRUE);
if (NULL != jnlpool->gtmsource_local)
break;
}
return (NORMAL_SHUTDOWN);
}
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