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fis-gtm/sr_unix/gtmsource.c

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/****************************************************************
* *
* Copyright 2001, 2011 Fidelity Information Services, Inc *
* *
* 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_inet.h"
#include <sys/mman.h>
#include "gtm_fcntl.h"
#include "gtm_unistd.h"
#include <errno.h>
#include <sys/sem.h>
#include <sys/wait.h>
#include "gdsroot.h"
#include "gdsblk.h"
#include "gtm_facility.h"
#include "fileinfo.h"
#include "gdsbt.h"
#include "gdsfhead.h"
#include "gdskill.h"
#include "gdscc.h"
#include "filestruct.h"
#include "jnl.h"
#include "buddy_list.h"
#include "hashtab_int4.h"
#include "tp.h"
#include "repl_msg.h"
#include "gtmsource.h"
#include "repl_dbg.h"
#include "error.h"
#include "gtm_stdio.h"
#include "gtm_string.h"
#include "cli.h"
#include "iosp.h"
#include "repl_log.h"
#include "repl_errno.h"
#include "gtm_event_log.h"
#include "repl_shutdcode.h"
#include "repl_sem.h"
#include "repl_filter.h"
#include "eintr_wrappers.h"
#include "send_msg.h"
#include "is_proc_alive.h"
#include "gtmmsg.h"
#include "sgtm_putmsg.h"
#include "repl_comm.h"
#include "repl_instance.h"
#include "ftok_sems.h"
#include "gt_timer.h" /* for LONG_SLEEP macro (hiber_start function prototype) */
#include "init_secshr_addrs.h"
#include "mutex.h"
#include "gtm_zlib.h"
#include "fork_init.h"
GBLDEF boolean_t gtmsource_logstats = FALSE, gtmsource_pool2file_transition = FALSE;
GBLDEF int gtmsource_filter = NO_FILTER;
GBLDEF boolean_t update_disable = FALSE;
GBLREF gtmsource_options_t gtmsource_options;
GBLREF gtmsource_state_t gtmsource_state;
GBLREF boolean_t is_src_server;
GBLREF jnlpool_addrs jnlpool;
GBLREF uint4 process_id;
GBLREF int gtmsource_sock_fd;
GBLREF int gtmsource_log_fd;
GBLREF FILE *gtmsource_log_fp;
GBLREF int gtmsource_statslog_fd;
GBLREF FILE *gtmsource_statslog_fp;
GBLREF gd_addr *gd_header;
GBLREF void (*call_on_signal)();
GBLREF seq_num gtmsource_save_read_jnl_seqno, seq_num_zero;
GBLREF gd_region *gv_cur_region;
GBLREF sgmnt_addrs *cs_addrs;
GBLREF sgmnt_data_ptr_t cs_data;
GBLREF repl_msg_ptr_t gtmsource_msgp;
GBLREF int gtmsource_msgbufsiz;
GBLREF unsigned char *gtmsource_tcombuff_start;
GBLREF uchar_ptr_t repl_filter_buff;
GBLREF int repl_filter_bufsiz;
GBLREF int gtmsource_srv_count;
GBLREF boolean_t primary_side_std_null_coll;
GBLREF boolean_t primary_side_trigger_support;
GBLREF gd_region *ftok_sem_reg;
GBLREF boolean_t holds_sem[NUM_SEM_SETS][NUM_SRC_SEMS];
GBLREF IN_PARMS *cli_lex_in_ptr;
GBLREF uint4 mutex_per_process_init_pid;
error_def(ERR_JNLPOOLSETUP);
error_def(ERR_MUPCLIERR);
error_def(ERR_NOTALLDBOPN);
error_def(ERR_NULLCOLLDIFF);
error_def(ERR_REPLCOMM);
error_def(ERR_REPLINFO);
error_def(ERR_REPLOFFJNLON);
error_def(ERR_TEXT);
int gtmsource()
{
gd_region *reg, *region_top;
sgmnt_addrs *csa, *repl_csa;
boolean_t jnlpool_creator, all_files_open, isalive;
int status, log_init_status, waitpid_res, save_errno;
pid_t pid, ppid, procgp;
seq_num read_jnl_seqno;
char print_msg[1024], tmpmsg[1024];
unix_db_info *udi;
gtmsource_local_ptr_t gtmsource_local;
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(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);
}
jnlpool_init(GTMSOURCE, gtmsource_options.start, &jnlpool_creator);
/* jnlpool_creator == TRUE ==> this process created the journal pool
* 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) - NORMAL_SHUTDOWN);
else if (gtmsource_options.deactivate)
gtmsource_exit(gtmsource_mode_change(GTMSOURCE_MODE_PASSIVE) - 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.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;
DO_FORK(pid);
if (0 > pid)
{
save_errno = REPL_SEM_ERRNO;
rts_error(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(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 (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);
}
/* 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;
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. */
assert(!mutex_per_process_init_pid || mutex_per_process_init_pid == process_id);
if (!mutex_per_process_init_pid)
mutex_per_process_init();
ppid = getppid();
log_init_status = repl_log_init(REPL_GENERAL_LOG, &gtmsource_log_fd, NULL, gtmsource_options.log_file, NULL);
assert(SS_NORMAL == log_init_status);
repl_log_fd2fp(&gtmsource_log_fp, gtmsource_log_fd);
if (-1 == (procgp = setsid()))
send_msg(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(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 */
primary_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 (primary_side_std_null_coll != csa->hdr->std_null_coll)
{
if (-1 == primary_side_std_null_coll)
primary_side_std_null_coll = csa->hdr->std_null_coll;
else
{
gtm_putmsg(VARLSTCNT(1) ERR_NULLCOLLDIFF);
gtmsource_exit(ABNORMAL_SHUTDOWN);
}
}
if (!REPL_ALLOWED(csa) && JNL_ALLOWED(csa))
{
gtm_putmsg(VARLSTCNT(4) ERR_REPLOFFJNLON, 2, DB_LEN_STR(reg));
gtmsource_exit(ABNORMAL_SHUTDOWN);
}
if (reg->read_only && REPL_ALLOWED(csa->hdr))
{
gtm_putmsg(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);
}
}
primary_side_trigger_support = GTMTRIG_ONLY(TRUE;) NON_GTMTRIG_ONLY(FALSE;)
/* 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 (jnlpool_creator)
{
gtmsource_seqno_init();
if (ROOTPRIMARY_SPECIFIED == gtmsource_options.rootprimary)
{ /* Created the journal pool as a root primary. Append a triple to the replication instance file.
* Invoke the function "gtmsource_rootprimary_init" to do that. This function though requires that
* we hold the ftok semaphore as we will be updating the instance file. But we have a tricky
* situation in that the parent source server command is holding the ftok semaphore (and that is
* to ensure no one else attaches to the journal pool until the initialization is complete). We
* therefore fake the variable that indicates we hold the ftok semaphore and invoke the function.
* This way we will not fail any asserts that check this variable. This is ok since we know the
* parent is holding the ftok semaphore and waiting for us doing nothing else on the instance file.
*/
#ifndef REPL_DEBUG_NOBACKGROUND
udi = FILE_INFO(jnlpool.jnlpool_dummy_reg);
assert(!udi->grabbed_ftok_sem);
udi->grabbed_ftok_sem = TRUE;
#endif
gtmsource_rootprimary_init(jnlpool.jnlpool_ctl->jnl_seqno);
#ifndef REPL_DEBUG_NOBACKGROUND
udi->grabbed_ftok_sem = FALSE;
#endif
}
}
#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(VARLSTCNT(1) ERR_JNLPOOLSETUP);
/* Increment the source server count semaphore */
status = incr_sem(SOURCE, SRC_SERV_COUNT_SEM);
save_errno = REPL_SEM_ERRNO;
if (0 != status)
{
rts_error(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(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);
gtm_event_log(GTM_EVENT_LOG_ARGC, "MUPIP", "REPLINFO", print_msg);
jnl_setver();
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;
while (gtmsource_local->mode == GTMSOURCE_MODE_PASSIVE
&& gtmsource_local->shutdown == NO_SHUTDOWN)
SHORT_SLEEP(GTMSOURCE_WAIT_FOR_MODE_CHANGE);
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;
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);
if (SS_NORMAL != (status = gtmsource_alloc_tcombuff()))
rts_error(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
{
if (EREPL_FILTERSTART_EXEC == repl_errno)
gtmsource_exit(ABNORMAL_SHUTDOWN);
}
}
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);
QWASSIGN(gtmsource_local->read_addr, jnlpool.jnlpool_ctl->write_addr);
gtmsource_local->read = jnlpool.jnlpool_ctl->write;
gtmsource_local->read_state = 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);
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(&gtmsource_sock_fd);
if (gtmsource_filter & EXTERNAL_FILTER)
repl_stop_filter();
} while (TRUE);
gtmsource_end();
return(SS_NORMAL);
}
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