fis-gtm/sr_port/mur_forward.c

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/****************************************************************
* *
* Copyright 2001, 2012 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 <stddef.h> /* for offsetof() macro */
#include "gtm_time.h"
#include "gtm_string.h"
#include "min_max.h"
#ifdef VMS
#include <rms.h>
#include <devdef.h>
#include <ssdef.h>
#endif
#include "gdsroot.h"
#include "gdsbt.h"
#include "gtm_facility.h"
#include "fileinfo.h"
#include "gdsblk.h"
#include "gdsfhead.h"
#include "filestruct.h"
#include "jnl.h"
#include "buddy_list.h"
#include "hashtab_int4.h" /* needed for muprec.h */
#include "hashtab_int8.h" /* needed for muprec.h */
#include "hashtab_mname.h" /* needed for muprec.h */
#include "muprec.h"
#include "gdskill.h" /* needed for tp.h */
#include "gdscc.h" /* needed for tp.h */
#include "tp.h"
#include "mur_jnl_ext.h"
#include "iosp.h"
#include "gtmmsg.h"
#include "op.h"
#include "mu_gv_stack_init.h"
#include "targ_alloc.h"
#include "tp_change_reg.h"
#include "gvcst_protos.h" /* for gvcst_root_search prototype */
#include "tp_set_sgm.h"
#ifdef GTM_CRYPT
#include "gtmcrypt.h"
#endif
GBLREF gv_namehead *gv_target;
GBLREF gd_region *gv_cur_region;
GBLREF sgmnt_addrs *cs_addrs;
GBLREF sgmnt_data_ptr_t cs_data;
GBLREF int4 gv_keysize;
GBLREF mur_gbls_t murgbl;
GBLREF reg_ctl_list *mur_ctl, *rctl_start;
GBLREF jnl_process_vector *prc_vec;
GBLREF mur_opt_struct mur_options;
GBLREF uint4 dollar_tlevel;
GBLREF jnl_gbls_t jgbl;
GBLREF jnl_fence_control jnl_fence_ctl;
GBLREF boolean_t skip_dbtriggers; /* see gbldefs.c for description of this global */
error_def(ERR_BLKCNTEDITFAIL);
error_def(ERR_JNLREADEOF);
static void (* const extraction_routine[])() =
{
#define JNL_TABLE_ENTRY(rectype, extract_rtn, label, update, fixed_size, is_replicated) extract_rtn,
#include "jnl_rec_table.h"
#undef JNL_TABLE_ENTRY
};
uint4 mur_forward(jnl_tm_t min_broken_time, seq_num min_broken_seqno, seq_num losttn_seqno)
{
boolean_t added, this_reg_stuck;
boolean_t is_set_kill_zkill_ztworm, is_set_kill_zkill;
jnl_record *rec;
enum jnl_record_type rectype;
enum rec_fence_type rec_fence;
enum broken_type recstat;
jnl_tm_t rec_time;
int4 rec_image_count = 0; /* This is a dummy variable for UNIX */
uint4 status, regcnt_stuck, num_partners;
mval mv;
reg_ctl_list *rctl, *rctl_top, *prev_rctl;
jnl_ctl_list *jctl;
gd_region *reg;
sgmnt_addrs *csa;
seq_num rec_token_seq;
forw_multi_struct *forw_multi;
multi_struct *multi;
skip_dbtriggers = TRUE; /* do not want to invoke any triggers for updates done by journal recovery */
murgbl.extr_buff = (char *)malloc(murgbl.max_extr_record_length);
for (recstat = (enum broken_type)0; recstat < TOT_EXTR_TYPES; recstat++)
murgbl.extr_file_create[recstat] = TRUE;
jgbl.dont_reset_gbl_jrec_time = jgbl.forw_phase_recovery = TRUE;
assert(NULL == jgbl.mur_pini_addr_reset_fnptr);
jgbl.mur_pini_addr_reset_fnptr = (pini_addr_reset_fnptr)mur_pini_addr_reset;
gv_keysize = DBKEYSIZE(MAX_KEY_SZ);
mu_gv_stack_init();
murgbl.consist_jnl_seqno = 0;
/* Note down passed in values in murgbl global so "mur_forward_play_cur_jrec" function can see it as well */
murgbl.min_broken_time = min_broken_time;
murgbl.min_broken_seqno = min_broken_seqno;
murgbl.losttn_seqno = losttn_seqno;
DEBUG_ONLY(murgbl.save_losttn_seqno = losttn_seqno;) /* keep save_losttn_seqno in sync at start of mur_forward.
* an assert in mur_close_files later checks this did not change.
*/
assert(!mur_options.rollback || (murgbl.losttn_seqno <= murgbl.min_broken_seqno));
prev_rctl = NULL;
rctl_start = NULL;
assert(0 == murgbl.regcnt_remaining);
for (rctl = mur_ctl, rctl_top = mur_ctl + murgbl.reg_total; rctl < rctl_top; rctl++)
{
if (mur_options.forward)
{
assert(NULL == rctl->jctl_turn_around);
jctl = rctl->jctl = rctl->jctl_head;
assert(jctl->reg_ctl == rctl);
jctl->rec_offset = JNL_HDR_LEN;
jnl_fence_ctl.fence_list = JNL_FENCE_LIST_END; /* initialized to reflect journaling is not enabled */
} else
{
jctl = rctl->jctl = (NULL == rctl->jctl_turn_around) ? rctl->jctl_head : rctl->jctl_turn_around;
assert(jctl->reg_ctl == rctl);
jctl->rec_offset = jctl->turn_around_offset;
jgbl.mur_jrec_seqno = jctl->turn_around_seqno;
if (mur_options.rollback && (murgbl.consist_jnl_seqno < jgbl.mur_jrec_seqno))
{ /* Assert that murgbl.losttn_seqno is never lesser than jgbl.mur_jrec_seqno (the turnaround
* point seqno) as this is what murgbl.consist_jnl_seqno is going to be set to and will
* eventually be the post-rollback seqno. If this condition is violated, the result of the
* recovery is a compromised database (the file header will indicate a Region Seqno which
* is not necessarily correct since seqnos prior to it might be absent in the database).
* Therefore, this is an out-of-design situation with respect to rollback and so stop it.
*/
assert(murgbl.losttn_seqno >= jgbl.mur_jrec_seqno);
murgbl.consist_jnl_seqno = jgbl.mur_jrec_seqno;
}
assert(murgbl.consist_jnl_seqno <= murgbl.losttn_seqno);
assert((NULL != rctl->jctl_turn_around) || (0 == jctl->rec_offset));
}
if (mur_options.update || mur_options.extr[GOOD_TN])
{
reg = rctl->gd;
gv_cur_region = reg;
tp_change_reg(); /* note : sets cs_addrs to non-NULL value even if gv_cur_region->open is FALSE
* (cs_data could still be NULL). */
rctl->csa = cs_addrs;
cs_addrs->rctl = rctl;
rctl->csd = cs_data;
rctl->sgm_info_ptr = cs_addrs->sgm_info_ptr;
SET_CSA_DIR_TREE(cs_addrs, MAX_KEY_SZ, reg);
gv_target = cs_addrs->dir_tree;
}
jctl->after_end_of_data = FALSE;
status = mur_next(jctl, jctl->rec_offset);
assert(ERR_JNLREADEOF != status); /* cannot get EOF at start of forward processing */
if (SS_NORMAL != status)
return status;
PRINT_VERBOSE_STAT(jctl, "mur_forward:at the start");
/* Any multi-region TP transaction will be processed as multiple single-region TP transactions up
* until the tp-resolve-time is reached. From then on, they will be treated as one multi-region TP
* transaction. This is needed for proper lost-tn determination (any multi-region transaction that
* gets played in a region AFTER it has already encountered a broken tn should treat this as a lost tn).
*/
do
{
assert(jctl == rctl->jctl);
rec = rctl->mur_desc->jnlrec;
rec_time = rec->prefix.time;
if (rec_time > mur_options.before_time)
break; /* Records after -BEFORE_TIME do not go to extract or losttrans or brkntrans files */
if (rec_time < mur_options.after_time)
{
status = mur_next_rec(&jctl);
continue; /* Records before -AFTER_TIME do not go to extract or losttrans or brkntrans files */
}
if (rec_time >= jgbl.mur_tp_resolve_time)
break; /* Records after tp-resolve-time will be processed below */
/* TODO: what do we do if we find a BROKEN tn here? */
status = mur_forward_play_cur_jrec(rctl);
if (SS_NORMAL != status)
break;
status = mur_next_rec(&jctl);
} while (SS_NORMAL == status);
CHECK_IF_EOF_REACHED(rctl, status); /* sets rctl->forw_eof_seen if needed; resets "status" to SS_NORMAL */
if (SS_NORMAL != status)
return status;
if (rctl->forw_eof_seen)
{
PRINT_VERBOSE_STAT(jctl, "mur_forward:Reached EOF before tp_resolve_time");
continue; /* Reached EOF before even getting to tp_resolve_time.
* Do not even consider region for next processing loop */
}
rctl->last_tn = 0;
rctl->process_losttn = FALSE;
murgbl.regcnt_remaining++; /* # of regions participating in recovery at this point */
if (NULL == rctl_start)
rctl_start = rctl;
if (NULL != prev_rctl)
{
prev_rctl->next_rctl = rctl;
rctl->prev_rctl = prev_rctl;
}
prev_rctl = rctl;
assert(murgbl.ok_to_update_db || !rctl->db_updated);
PRINT_VERBOSE_STAT(jctl, "mur_forward:at tp_resolve_time");
}
/* Note that it is possible for rctl_start to be NULL at this point. That is there is no journal record in any region
* AFTER the calculated tp-resolve-time. This is possible if for example -AFTER_TIME was used and has a time later
* than any journal record in all journal files. If rctl_start is NULL, prev_rctl should also be NULL and vice versa.
*/
if (prev_rctl != rctl_start)
{
assert(NULL != prev_rctl);
assert(NULL != rctl_start);
prev_rctl->next_rctl = rctl_start;
rctl_start->prev_rctl = prev_rctl;
} else
{ /* prev_rctl & rctl_start are identical. They both should be NULL or should point to a single element linked list */
assert((NULL == rctl_start) || (NULL == rctl_start->next_rctl) && (NULL == rctl_start->prev_rctl));
}
rctl = rctl_start;
regcnt_stuck = 0; /* # of regions we are stuck in waiting for other regions to resolve a multi-region TP transaction */
assert((NULL == rctl) || (NULL == rctl->forw_multi));
gv_cur_region = NULL; /* clear out any previous value to ensure gv_cur_region/cs_addrs/cs_data
* all get set in sync by the MUR_CHANGE_REG macro below.
*/
while (NULL != rctl)
{ /* while there is at least one region remaining with unprocessed journal records */
assert(NULL != rctl_start);
assert(0 < murgbl.regcnt_remaining);
if (NULL != rctl->forw_multi)
{ /* This region's current journal record is part of a TP transaction waiting for other regions */
regcnt_stuck++;
if (regcnt_stuck >= murgbl.regcnt_remaining)
GTMASSERT; /* Out-of-design situation. Stuck in ALL regions. */
rctl = rctl->next_rctl; /* Move on to the next available region */
assert(NULL != rctl);
continue;
}
regcnt_stuck = 0; /* restart the counter now that we found at least one non-stuck region */
MUR_CHANGE_REG(rctl);
jctl = rctl->jctl;
this_reg_stuck = FALSE;
for ( status = SS_NORMAL; SS_NORMAL == status; )
{
assert(jctl == rctl->jctl);
rec = rctl->mur_desc->jnlrec;
rec_time = rec->prefix.time;
assert(rec_time >= jgbl.mur_tp_resolve_time);
if (rec_time > mur_options.before_time)
break; /* Records after -BEFORE_TIME do not go to extract or losttrans or brkntrans files */
assert((0 == mur_options.after_time) || mur_options.forward && !rctl->db_updated);
if (rec_time < mur_options.after_time)
{
status = mur_next_rec(&jctl);
continue; /* Records before -AFTER_TIME do not go to extract or losttrans or brkntrans files */
}
/* Check if current journal record can be played right away or need to wait for corresponding journal
* records from other participating TP regions to be reached. A non-TP or ZTP transaction can be played
* without issues (i.e. has no dependencies with any other regions). A single-region TP transaction too
* falls in the same category. A multi-region TP transaction needs to wait until all participating regions
* have played all journal records BEFORE this TP in order to ensure recover plays records in the exact
* same order that GT.M performed them in.
*/
/* If FENCE_NONE is specified, we would not have maintained any multi hashtable in mur_back_process for
* broken transaction processing. So we process multi-region TP transactions as multiple single-region
* TP transactions in forward phase.
*/
if (FENCE_NONE != mur_options.fences)
{
rectype = (enum jnl_record_type)rec->prefix.jrec_type;
if (IS_TP(rectype) && IS_TUPD(rectype))
{
assert(IS_SET_KILL_ZKILL_ZTRIG_ZTWORM(rectype));
assert(&rec->jrec_set_kill.num_participants == &rec->jrec_ztworm.num_participants);
num_partners = rec->jrec_set_kill.num_participants;
assert(0 < num_partners);
if (1 < num_partners)
{
this_reg_stuck = TRUE;
assert(&rec->jrec_set_kill.update_num == &rec->jrec_ztworm.update_num);
}
}
}
if (this_reg_stuck)
{
rec_token_seq = GET_JNL_SEQNO(rec);
VMS_ONLY(
/* In VMS, pid is not unique. We need "image_count" as well. But this is not needed
* in case of rollback as the token is guaranteed to be unique in that case.
*/
if (!mur_options.rollback)
{
MUR_GET_IMAGE_COUNT(jctl, rec, rec_image_count, status);
if (SS_NORMAL != status)
{
this_reg_stuck = FALSE; /* so abnormal "status" gets checked below */
break;
}
}
)
/* In Unix, "rec_image_count" is ignored by the MUR_FORW* macros */
MUR_FORW_TOKEN_LOOKUP(forw_multi, rec_token_seq, rec_time, rec_image_count);
if (NULL != forw_multi)
{ /* This token has already been seen in another region in forward processing.
* Add current region as well. If all regions have been resolved, then play
* the entire transaction maintaining the exact same order of updates within.
*/
MUR_FORW_TOKEN_ONE_MORE_REG(forw_multi, rctl);
} else
{ /* First time we are seeing this token in forward processing. Check if this
* has already been determined to be a broken transaction.
*/
recstat = GOOD_TN;
multi = NULL;
if (IS_REC_POSSIBLY_BROKEN(rec_time, rec_token_seq))
{
multi = MUR_TOKEN_LOOKUP(rec_token_seq, rec_image_count, rec_time, TPFENCE);
if ((NULL != multi) && (0 < multi->partner))
recstat = BROKEN_TN;
}
MUR_FORW_TOKEN_ADD(forw_multi, rec_token_seq, rec_time, rctl, num_partners,
recstat, multi, rec_image_count);
}
/* Check that "tabent" field has been initialized above (by either the MUR_FORW_TOKEN_LOOKUP
* or MUR_FORW_TOKEN_ADD macros). This is relied upon by "mur_forward_play_multireg_tp" below.
*/
assert(NULL != forw_multi->u.tabent);
assert(forw_multi->num_reg_seen_forward <= forw_multi->num_reg_seen_backward);
if (forw_multi->num_reg_seen_forward == forw_multi->num_reg_seen_backward)
{ /* All regions have been seen in forward processing. Now play it.
* Note that the TP could be BROKEN_TN or GOOD_TN. The callee handles it.
*/
assert(forw_multi == rctl->forw_multi);
status = mur_forward_play_multireg_tp(forw_multi, rctl);
this_reg_stuck = FALSE;
/* Note that as part of playing the TP transaction, we could have reached
* the EOF of rctl. In this case, we need to break out of the loop.
*/
if ((SS_NORMAL != status) || rctl->forw_eof_seen)
break;
assert(NULL == rctl->forw_multi);
assert(!dollar_tlevel);
jctl = rctl->jctl; /* In case the first record after the most recently processed
* TP transaction is in the next generation journal file */
continue;
}
break;
} else
{
status = mur_forward_play_cur_jrec(rctl);
if (SS_NORMAL != status)
break;
}
assert(!this_reg_stuck);
status = mur_next_rec(&jctl);
}
assert((NULL == rctl->forw_multi) || this_reg_stuck);
assert((NULL != rctl->forw_multi) || !this_reg_stuck);
if (!this_reg_stuck)
{ /* We are not stuck in this region (to resolve a multi-region TP).
* This means we are done processing all the records of this region.
*/
assert(NULL == rctl->forw_multi);
if (!rctl->forw_eof_seen)
{
CHECK_IF_EOF_REACHED(rctl, status);
/* sets rctl->forw_eof_seen if needed; resets "status" to SS_NORMAL */
if (SS_NORMAL != status)
return status;
assert(!dollar_tlevel);
DELETE_RCTL_FROM_UNPROCESSED_LIST(rctl); /* since all of its records should have been processed */
} else
{ /* EOF was seen in rctl inside "mur_forward_play_multireg_tp" and it was removed
* from the unprocessed list of rctls. At the time rctl was removed, its "next_rctl"
* field could have been pointing to another <rctl> that has since then also been
* removed inside the same function. Therefore the "next_rctl" field is not reliable
* in this case but instead we should rely on the global variable "rctl_start" which
* points to the list of unprocessed rctls. Set "next_rctl" accordingly.
*/
rctl->next_rctl = rctl_start;
}
assert(rctl->deleted_from_unprocessed_list);
}
assert(!this_reg_stuck || !rctl->forw_eof_seen);
assert((NULL == rctl->next_rctl) || (NULL != rctl_start));
assert((NULL == rctl->next_rctl) || (0 < murgbl.regcnt_remaining));
rctl = rctl->next_rctl; /* Note : even though "rctl" could have been deleted from the doubly linked list above,
* rctl->next_rctl is not touched so we can still use it to get to the next element. */
}
assert(0 == murgbl.regcnt_remaining);
jgbl.mur_pini_addr_reset_fnptr = NULL; /* No more simulation of GT.M activity for any region */
prc_vec = murgbl.prc_vec; /* Use process-vector of MUPIP RECOVER (not any simulating GT.M process) now onwards */
assert(0 == dollar_tlevel);
for (rctl = mur_ctl, rctl_top = mur_ctl + murgbl.reg_total; rctl < rctl_top; rctl++)
{
PRINT_VERBOSE_STAT(rctl->jctl, "mur_forward:at the end");
assert(!mur_options.rollback || (0 != murgbl.consist_jnl_seqno));
assert(mur_options.rollback || (0 == murgbl.consist_jnl_seqno));
assert(!dollar_tlevel); /* In case it applied a broken TUPD */
assert(murgbl.ok_to_update_db || !rctl->db_updated);
rctl->mur_plst = NULL; /* reset now that simulation of GT.M updates is done */
/* Ensure mur_block_count_correct is called if updates allowed*/
if ((murgbl.ok_to_update_db) && (SS_NORMAL != mur_block_count_correct(rctl)))
{
gtm_putmsg(VARLSTCNT(4) ERR_BLKCNTEDITFAIL, 2, DB_LEN_STR(rctl->gd));
murgbl.wrn_count++;
}
}
return SS_NORMAL;
}