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activetable.c
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activetable.c
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/* -------------------------------------------------------------------------
*
* activetable.c
*
* This code is responsible for detecting active table for databases
*
* Copyright (C) 2013, PostgreSQL Global Development Group
*
*
* -------------------------------------------------------------------------
*/
#include "postgres.h"
#include "access/htup_details.h"
#include "catalog/indexing.h"
#include "catalog/pg_class.h"
#include "catalog/pg_type.h"
#include "executor/spi.h"
#include "funcapi.h"
#include "miscadmin.h"
#include "storage/shmem.h"
#include "storage/smgr.h"
#include "utils/builtins.h"
#include "utils/fmgroids.h"
#include "utils/relfilenodemap.h"
#include "utils/syscache.h"
#include "activetable.h"
#include "pg_utils.h"
HTAB *active_tables_map = NULL;
static smgrcreate_hook_type prev_smgrcreate_hook = NULL;
static smgrextend_hook_type prev_smgrextend_hook = NULL;
static smgrtruncate_hook_type prev_smgrtruncate_hook = NULL;
static smgrdounlinkall_hook_type prev_smgrdounlinkall_hook = NULL;
static void active_table_hook_smgrcreate(SMgrRelation reln,
ForkNumber forknum,
bool isRedo);
static void active_table_hook_smgrextend(SMgrRelation reln,
ForkNumber forknum,
BlockNumber blocknum,
char *buffer,
bool skipFsync);
static void active_table_hook_smgrtruncate(SMgrRelation reln,
ForkNumber forknum,
BlockNumber blocknum);
static void active_table_hook_smgrunlink(SMgrRelation *reln,
int nrels,
bool isRedo);
static void report_active_table_SmgrStat(SMgrRelation reln, ActiveType at);
static HTAB* get_active_tables_stats(void);
static HTAB* get_all_tables_stats(void);
void init_active_table_hook(void);
void init_shm_worker_active_tables(void);
void init_lock_active_tables(void);
HTAB* pg_fetch_active_tables(bool);
/*
* Register smgr hook to detect active table.
*/
void
init_active_table_hook(void)
{
prev_smgrcreate_hook = smgrcreate_hook;
smgrcreate_hook = active_table_hook_smgrcreate;
prev_smgrextend_hook = smgrextend_hook;
smgrextend_hook = active_table_hook_smgrextend;
prev_smgrtruncate_hook = smgrtruncate_hook;
smgrtruncate_hook = active_table_hook_smgrtruncate;
prev_smgrdounlinkall_hook = smgrdounlinkall_hook;
smgrdounlinkall_hook = active_table_hook_smgrunlink;
}
static void
active_table_hook_smgrcreate(SMgrRelation reln,
pg_attribute_unused() ForkNumber forknum,
pg_attribute_unused() bool isRedo)
{
report_active_table_SmgrStat(reln, AT_CREATE);
}
static void
active_table_hook_smgrextend(SMgrRelation reln,
pg_attribute_unused() ForkNumber forknum,
pg_attribute_unused() BlockNumber blocknum,
pg_attribute_unused() char *buffer,
pg_attribute_unused() bool skipFsync)
{
report_active_table_SmgrStat(reln, AT_EXTEND);
}
static void
active_table_hook_smgrtruncate(SMgrRelation reln,
pg_attribute_unused() ForkNumber forknum,
pg_attribute_unused() BlockNumber blocknum)
{
report_active_table_SmgrStat(reln, AT_TRUNCATE);
}
static void active_table_hook_smgrunlink(SMgrRelation *reln,
pg_attribute_unused() int nrels,
pg_attribute_unused() bool isRedo)
{
int i;
for (i = 0; i < nrels; i++)
{
report_active_table_SmgrStat(reln[i], AT_UNLINK);
}
}
/*
* Init active_tables_map shared memory
*/
void
init_shm_worker_active_tables(void)
{
HASHCTL ctl;
memset(&ctl, 0, sizeof(ctl));
ctl.keysize = sizeof(RelFileNode);
ctl.entrysize = sizeof(DiskQuotaActiveTableEntry);
ctl.hash = tag_hash;
active_tables_map = ShmemInitHash ("active_tables",
diskquota_max_active_tables,
diskquota_max_active_tables,
&ctl,
HASH_ELEM | HASH_FUNCTION);
}
/*
* Fetch active table file size statistics.
* If force is true, then fetch all the tables.
*/
HTAB* pg_fetch_active_tables(bool force)
{
if (force)
{
return get_all_tables_stats();
}
else
{
return get_active_tables_stats();
}
}
/*
* Get the table size statistics for all the tables
*/
static HTAB*
get_all_tables_stats()
{
HTAB *local_table_stats_map = NULL;
HASHCTL ctl;
HeapTuple tuple;
Relation classRel;
HeapScanDesc relScan;
memset(&ctl, 0, sizeof(ctl));
ctl.keysize = sizeof(RelFileNode);
ctl.entrysize = sizeof(DiskQuotaActiveTableEntry);
ctl.hcxt = CurrentMemoryContext;
ctl.hash = tag_hash;
local_table_stats_map = hash_create("local table map with table size info",
1024,
&ctl,
HASH_ELEM | HASH_CONTEXT | HASH_FUNCTION);
classRel = heap_open(RelationRelationId, AccessShareLock);
relScan = heap_beginscan_catalog(classRel, 0, NULL);
while ((tuple = heap_getnext(relScan, ForwardScanDirection)) != NULL)
{
Oid relOid;
DiskQuotaActiveTableEntry *entry;
RelFileNode node;
Form_pg_class classForm = (Form_pg_class) GETSTRUCT(tuple);
if (classForm->relkind != RELKIND_RELATION &&
classForm->relkind != RELKIND_MATVIEW)
continue;
relOid = classForm->oid;
/* ignore system table*/
if (relOid < FirstNormalObjectId)
continue;
if (classForm->reltablespace == 0)
{
/*
* reltablespace = 0 means it uses default table space, so assign it by MyDatabaseTableSpace
* as the relfilenode spcNode is not zero when it is in default table space.
*/
node.spcNode = MyDatabaseTableSpace;
}
else
{
node.spcNode = classForm->reltablespace;
}
node.dbNode = MyDatabaseId;
node.relNode = classForm->relfilenode;
entry = (DiskQuotaActiveTableEntry *) hash_search(local_table_stats_map, &node, HASH_ENTER, NULL);
entry->node = node;
entry->type = AT_EXTEND;
entry->tablesize = diskquota_get_table_size_by_oid(relOid);
}
heap_endscan(relScan);
heap_close(classRel, AccessShareLock);
return local_table_stats_map;
}
/**
* Get local active table with table oid and table size info.
* This function first copies active table map from shared memory
* to local active table map with refilenode info. Then traverses
* the local map and find corresponding table oid and table file
* size. Finnaly stores them into local active table map and return.
*/
static HTAB*
get_active_tables_stats()
{
HASHCTL ctl;
HTAB *local_active_table_file_map = NULL;
HTAB *local_active_table_stats_map = NULL;
HASH_SEQ_STATUS iter;
DiskQuotaActiveTableFileEntry *active_table_file_entry;
DiskQuotaActiveTableEntry *active_table_entry;
Oid relOid;
memset(&ctl, 0, sizeof(ctl));
ctl.keysize = sizeof(RelFileNode);
ctl.entrysize = sizeof(DiskQuotaActiveTableFileEntry);
ctl.hcxt = CurrentMemoryContext;
ctl.hash = tag_hash;
local_active_table_file_map = hash_create("local active table map with relfilenode info",
1024,
&ctl,
HASH_ELEM | HASH_CONTEXT | HASH_FUNCTION);
/* Move active table from shared memory to local active table map */
LWLockAcquire(diskquota_locks.active_table_lock, LW_EXCLUSIVE);
hash_seq_init(&iter, active_tables_map);
while ((active_table_file_entry = (DiskQuotaActiveTableFileEntry *) hash_seq_search(&iter)) != NULL)
{
bool found;
DiskQuotaActiveTableFileEntry *entry;
if (active_table_file_entry->node.dbNode != MyDatabaseId)
{
continue;
}
/* Add the active table entry into local hash table*/
entry = hash_search(local_active_table_file_map, &active_table_file_entry->node, HASH_ENTER, &found);
*entry = *active_table_file_entry;
hash_search(active_tables_map, &active_table_file_entry->node, HASH_REMOVE, &found);
}
LWLockRelease(diskquota_locks.active_table_lock);
memset(&ctl, 0, sizeof(ctl));
ctl.keysize = sizeof(RelFileNode);
ctl.entrysize = sizeof(DiskQuotaActiveTableEntry);
ctl.hcxt = CurrentMemoryContext;
ctl.hash = tag_hash;
local_active_table_stats_map = hash_create("local active table map with relfilenode info",
1024,
&ctl,
HASH_ELEM | HASH_CONTEXT | HASH_FUNCTION);
/* traverse local active table map and calculate their file size. */
hash_seq_init(&iter, local_active_table_file_map);
/* scan whole local map, get the oid of each table and calculate the size of them */
while ((active_table_file_entry = (DiskQuotaActiveTableFileEntry *) hash_seq_search(&iter)) != NULL)
{
bool found;
switch (active_table_file_entry->tablestatus)
{
case TABLE_COMMIT_CREATE:
case TABLE_COMMIT_CHANGE:
relOid = RelidByRelfilenode(active_table_file_entry->node.spcNode,
active_table_file_entry->node.relNode);
if (relOid != InvalidOid) {
active_table_entry = hash_search(local_active_table_stats_map, &active_table_file_entry->node,
HASH_ENTER, &found);
active_table_entry->node = active_table_file_entry->node;
active_table_entry->tablesize = diskquota_get_table_size_by_oid(relOid);
active_table_entry->type = AT_EXTEND;
hash_search(local_active_table_file_map, &active_table_file_entry->node, HASH_REMOVE, NULL);
} else {
active_table_file_entry->ispushedback = true;
}
break;
case TABLE_IN_TRANSX_CHANGE:
case TABLE_IN_TRANSX_CREATE:
active_table_entry = hash_search(local_active_table_stats_map, &active_table_file_entry->node,
HASH_ENTER, &found);
active_table_entry->node = active_table_file_entry->node;
active_table_entry->tablesize = diskquota_get_table_size_by_relfilenode(&active_table_entry->node);
active_table_entry->namespace = active_table_file_entry->inXnamespace;
active_table_entry->owner = active_table_file_entry->inXowner;
active_table_entry->type = AT_EXTEND;
hash_search(local_active_table_file_map, &active_table_file_entry->node, HASH_REMOVE, NULL);
break;
case TABLE_COMMIT_DELETE:
case TABLE_IN_TRANSX_DELETE:
active_table_entry = hash_search(local_active_table_stats_map, &active_table_file_entry->node,
HASH_ENTER, &found);
active_table_entry->node = active_table_file_entry->node;
active_table_entry->type = AT_UNLINK;
hash_search(local_active_table_file_map, &active_table_file_entry->node, HASH_REMOVE, NULL);
break;
default:
/* Unknown status of entry, ignore it*/
ereport(LOG, (errmsg("found an entry in unexpected status, table status is %d, relnode is %d", active_table_file_entry->tablestatus,
active_table_file_entry->node.relNode)));
hash_search(local_active_table_file_map, &active_table_file_entry->node, HASH_REMOVE, NULL);
break;
}
}
/* If table is not found, it could be in transaction, so push back to share memory */
if (hash_get_num_entries(local_active_table_file_map) > 0)
{
bool found;
DiskQuotaActiveTableFileEntry *entry;
/* traverse local active table map and rewrite them into share memory */
hash_seq_init(&iter, local_active_table_file_map);
LWLockAcquire(diskquota_locks.active_table_lock, LW_EXCLUSIVE);
while ((active_table_file_entry = (DiskQuotaActiveTableFileEntry *) hash_seq_search(&iter)) != NULL)
{
entry = hash_search(active_tables_map, &active_table_file_entry->node, HASH_ENTER_NULL, &found);
if (entry)
{
*entry = *active_table_file_entry;
}
}
LWLockRelease(diskquota_locks.active_table_lock);
}
hash_destroy(local_active_table_file_map);
return local_active_table_stats_map;
}
/**
* Hook function in smgr to report the active table
* information and stroe them in active table shared memory
* diskquota worker will consuming these active tables and
* recalculate their file size to update diskquota model.
*/
static void
report_active_table_SmgrStat(SMgrRelation reln, ActiveType at)
{
DiskQuotaActiveTableFileEntry *entry = NULL;
bool found = false;
/* ignore the system table relfilenode */
if (reln->smgr_rnode.node.relNode < FirstNormalObjectId)
return;
LWLockAcquire(diskquota_locks.active_table_lock, LW_EXCLUSIVE);
entry = hash_search(active_tables_map, &reln->smgr_rnode.node, HASH_ENTER_NULL, &found);
if (entry && !entry->ispushedback)
{
entry->node = reln->smgr_rnode.node;
switch (at)
{
case AT_EXTEND :
case AT_TRUNCATE :
entry->tablestatus = TABLE_COMMIT_CHANGE;
entry->inXnamespace = InvalidOid;
entry->inXowner = InvalidOid;
break;
case AT_CREATE:
entry->tablestatus = TABLE_COMMIT_CREATE;
entry->inXnamespace = InvalidOid;
entry->inXowner = InvalidOid;
break;
case AT_UNLINK:
entry->tablestatus = TABLE_COMMIT_DELETE;
entry->inXnamespace = InvalidOid;
entry->inXowner = InvalidOid;
break;
default:
entry->tablestatus = TABLE_UNKNOWN;
break;
}
}
/*
* if the entry is still in active list and marked as un-committed,
* this means the entry is only visible in transaction, and need to process here
* TODO: this is time consuming, may need to let user to choose enable or disable
*/
else if (entry && found && entry->ispushedback)
{
Oid relOid;
HeapTuple tuple;
Form_pg_class rel;
/*
* If the entry status is TABLE_NOT_FOUND, but its action type is AT_UNLINK. This means
* the transaction is under committing or aborting, hence we just need ignore this active
* entry and send its unlink status back to worker.
*/
if (at == AT_UNLINK)
{
entry->tablestatus = TABLE_IN_TRANSX_DELETE;
}
else
{
relOid = RelidByRelfilenode(entry->node.spcNode, entry->node.relNode);
tuple = SearchSysCache1(RELOID, ObjectIdGetDatum(relOid));
if (HeapTupleIsValid(tuple))
{
rel = (Form_pg_class) GETSTRUCT(tuple);
entry->inXnamespace = rel->relnamespace;
entry->inXowner = rel->relowner;
switch (at)
{
case AT_EXTEND :
case AT_TRUNCATE :
entry->tablestatus = TABLE_IN_TRANSX_CHANGE;
break;
case AT_CREATE:
entry->tablestatus = TABLE_IN_TRANSX_CREATE;
break;
default:
entry->tablestatus = TABLE_UNKNOWN;
break;
}
ReleaseSysCache(tuple);
}
else
{
ereport(LOG, (errmsg("Unknown database file with tablespace:relfilenode is %d:%d"
,entry->node.spcNode, entry->node.relNode)));
entry->tablestatus = TABLE_UNKNOWN;
}
}
}
else if (entry == NULL)
{
/* We may miss the file size change of this relation at current refresh interval.*/
ereport(WARNING, (errmsg("Share memory is not enough for active tables.")));
}
LWLockRelease(diskquota_locks.active_table_lock);
}