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Merge pull request #4680 from citusdata/fix_deadlock 

Don't include stripe reservation locks in lock graph
pull/4679/head^2
Hadi Moshayedi 2021-02-10 13:27:10 -08:00 committed by GitHub
parent 7170ed287c c3dcd6b9f8
commit 1d4b2e3fd0
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GPG Key ID: 4AEE18F83AFDEB23
3 changed files with 73 additions and 24 deletions
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73
src/backend/columnar/cstore_metadata_tables.c
View File

@ -30,6 +30,7 @@
#include "commands/sequence.h"
#include "commands/trigger.h"
#include "distributed/metadata_cache.h"
#include "distributed/resource_lock.h"
#include "executor/executor.h"
#include "executor/spi.h"
#include "miscadmin.h"
@ -79,6 +80,8 @@ static void InsertStripeMetadataRow(uint64 storageId, StripeMetadata *stripe);
static void GetHighestUsedAddressAndId(uint64 storageId,
uint64 *highestUsedAddress,
uint64 *highestUsedId);
static void LockForStripeReservation(Relation rel, LOCKMODE mode);
static void UnlockForStripeReservation(Relation rel, LOCKMODE mode);
static List * ReadDataFileStripeList(uint64 storageId, Snapshot snapshot);
static Oid ColumnarStorageIdSequenceRelationId(void);
static Oid ColumnarStripeRelationId(void);
@ -284,8 +287,8 @@ WriteColumnarOptions(Oid regclass, ColumnarOptions *options, bool overwrite)
}
systable_endscan_ordered(scanDescriptor);
index_close(index, NoLock);
relation_close(columnarOptions, NoLock);
index_close(index, AccessShareLock);
relation_close(columnarOptions, RowExclusiveLock);
return written;
}
@ -335,8 +338,8 @@ DeleteColumnarTableOptions(Oid regclass, bool missingOk)
}
systable_endscan_ordered(scanDescriptor);
index_close(index, NoLock);
relation_close(columnarOptions, NoLock);
index_close(index, AccessShareLock);
relation_close(columnarOptions, RowExclusiveLock);
return result;
}
@ -365,7 +368,7 @@ ReadColumnarOptions(Oid regclass, ColumnarOptions *options)
Relation index = try_relation_open(ColumnarOptionsIndexRegclass(), AccessShareLock);
if (index == NULL)
{
table_close(columnarOptions, NoLock);
table_close(columnarOptions, AccessShareLock);
/* extension has been dropped */
return false;
@ -394,8 +397,8 @@ ReadColumnarOptions(Oid regclass, ColumnarOptions *options)
}
systable_endscan_ordered(scanDescriptor);
index_close(index, NoLock);
relation_close(columnarOptions, NoLock);
index_close(index, AccessShareLock);
relation_close(columnarOptions, AccessShareLock);
return true;
}
@ -464,7 +467,7 @@ SaveStripeSkipList(RelFileNode relfilenode, uint64 stripe, StripeSkipList *chunk
}
FinishModifyRelation(modifyState);
table_close(columnarChunk, NoLock);
table_close(columnarChunk, RowExclusiveLock);
CommandCounterIncrement();
}
@ -610,8 +613,8 @@ ReadStripeSkipList(RelFileNode relfilenode, uint64 stripe, TupleDesc tupleDescri
}
systable_endscan_ordered(scanDescriptor);
index_close(index, NoLock);
table_close(columnarChunk, NoLock);
index_close(index, AccessShareLock);
table_close(columnarChunk, AccessShareLock);
return chunkList;
}
@ -646,7 +649,7 @@ InsertStripeMetadataRow(uint64 storageId, StripeMetadata *stripe)
CommandCounterIncrement();
table_close(columnarStripes, NoLock);
table_close(columnarStripes, RowExclusiveLock);
}
@ -727,6 +730,35 @@ GetHighestUsedAddressAndId(uint64 storageId,
}
/*
* LockForStripeReservation acquires a lock for stripe reservation.
*/
static void
LockForStripeReservation(Relation rel, LOCKMODE mode)
{
/*
* We use an advisory lock here so we can easily detect these kind of
* locks in IsProcessWaitingForSafeOperations() and don't include them
* in the lock graph.
*/
LOCKTAG tag;
SET_LOCKTAG_COLUMNAR_STRIPE_RESERVATION(tag, rel);
LockAcquire(&tag, mode, false, false);
}
/*
* UnlockForStripeReservation releases the stripe reservation lock.
*/
static void
UnlockForStripeReservation(Relation rel, LOCKMODE mode)
{
LOCKTAG tag;
SET_LOCKTAG_COLUMNAR_STRIPE_RESERVATION(tag, rel);
LockRelease(&tag, mode, false);
}
/*
* ReserveStripe reserves and stripe of given size for the given relation,
* and inserts it into columnar.stripe. It is guaranteed that concurrent
@ -742,16 +774,13 @@ ReserveStripe(Relation rel, uint64 sizeBytes,
uint64 highestId = 0;
/*
* We take ShareUpdateExclusiveLock here, so two space
* reservations conflict, space reservation <-> vacuum
* conflict, but space reservation doesn't conflict with
* reads & writes.
* We take ExclusiveLock here, so two space reservations conflict.
*/
LockRelation(rel, ShareUpdateExclusiveLock);
LOCKMODE lockMode = ExclusiveLock;
LockForStripeReservation(rel, lockMode);
RelFileNode relfilenode = rel->rd_node;
/*
* If this is the first stripe for this relation, initialize the
* metapage, otherwise use the previously initialized metapage.
@ -793,7 +822,7 @@ ReserveStripe(Relation rel, uint64 sizeBytes,
InsertStripeMetadataRow(metapage->storageId, &stripe);
UnlockRelation(rel, ShareUpdateExclusiveLock);
UnlockForStripeReservation(rel, lockMode);
return stripe;
}
@ -849,8 +878,8 @@ ReadDataFileStripeList(uint64 storageId, Snapshot snapshot)
}
systable_endscan_ordered(scanDescriptor);
index_close(index, NoLock);
table_close(columnarStripes, NoLock);
index_close(index, AccessShareLock);
table_close(columnarStripes, AccessShareLock);
return stripeMetadataList;
}
@ -911,8 +940,8 @@ DeleteMetadataRows(RelFileNode relfilenode)
FinishModifyRelation(modifyState);
systable_endscan_ordered(scanDescriptor);
index_close(index, NoLock);
table_close(columnarStripes, NoLock);
index_close(index, AccessShareLock);
table_close(columnarStripes, AccessShareLock);
}

12
src/backend/distributed/transaction/lock_graph.c
View File

@ -25,6 +25,7 @@
#include "distributed/lock_graph.h"
#include "distributed/metadata_cache.h"
#include "distributed/remote_commands.h"
#include "distributed/resource_lock.h"
#include "distributed/tuplestore.h"
#include "storage/proc.h"
#include "utils/builtins.h"
@ -471,9 +472,18 @@ IsProcessWaitingForSafeOperations(PGPROC *proc)
PROCLOCK *waitProcLock = proc->waitProcLock;
LOCK *waitLock = waitProcLock->tag.myLock;
/*
* Stripe reservation locks are temporary & don't hold until end of
* transaction, so we shouldn't include them in the lock graph.
*/
bool stripeReservationLock =
waitLock->tag.locktag_type == LOCKTAG_ADVISORY &&
waitLock->tag.locktag_field4 == ADV_LOCKTAG_CLASS_COLUMNAR_STRIPE_RESERVATION;
return waitLock->tag.locktag_type == LOCKTAG_RELATION_EXTEND ||
waitLock->tag.locktag_type == LOCKTAG_PAGE ||
waitLock->tag.locktag_type == LOCKTAG_SPECULATIVE_TOKEN;
waitLock->tag.locktag_type == LOCKTAG_SPECULATIVE_TOKEN ||
stripeReservationLock;
}

12
src/include/distributed/resource_lock.h
View File

@ -38,7 +38,10 @@ typedef enum AdvisoryLocktagClass
ADV_LOCKTAG_CLASS_CITUS_JOB = 6,
ADV_LOCKTAG_CLASS_CITUS_REBALANCE_COLOCATION = 7,
ADV_LOCKTAG_CLASS_CITUS_COLOCATED_SHARDS_METADATA = 8,
ADV_LOCKTAG_CLASS_CITUS_OPERATIONS = 9
ADV_LOCKTAG_CLASS_CITUS_OPERATIONS = 9,
/* Columnar lock types */
ADV_LOCKTAG_CLASS_COLUMNAR_STRIPE_RESERVATION = 10
} AdvisoryLocktagClass;
/* CitusOperations has constants for citus operations */
@ -98,6 +101,13 @@ typedef enum CitusOperations
(uint32) operationId, \
ADV_LOCKTAG_CLASS_CITUS_OPERATIONS)
#define SET_LOCKTAG_COLUMNAR_STRIPE_RESERVATION(tag, relation) \
SET_LOCKTAG_ADVISORY(tag, \
relation->rd_lockInfo.lockRelId.dbId, \
relation->rd_lockInfo.lockRelId.relId, \
0, \
ADV_LOCKTAG_CLASS_COLUMNAR_STRIPE_RESERVATION)
/* Lock shard/relation metadata for safe modifications */
extern void LockShardDistributionMetadata(int64 shardId, LOCKMODE lockMode);
extern void LockShardListMetadataOnWorkers(LOCKMODE lockmode, List *shardIntervalList);