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Make pg_waldump report more detail information about PREPARE TRANSACTION record.

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This commit changes xact_desc() so that it reports the detail information about
PREPARE TRANSACTION record, like GID (global transaction identifier),
timestamp at prepare transaction, delete-on-abort/commit relations,
XID of subtransactions, and invalidation messages. These are helpful
when diagnosing 2PC-related troubles.

Author: Fujii Masao
Reviewed-by: Michael Paquier, Andrey Lepikhov, Kyotaro Horiguchi, Julien Rouhaud, Alvaro Herrera
Discussion: https://postgr.es/m/CAHGQGwEvhASad4JJnCv=0dW2TJypZgW_Vpb-oZik2a3utCqcrA@mail.gmail.com
This commit is contained in:
Fujii Masao
2019-11-13 16:59:17 +09:00
parent 94fec48516
commit 7b8a899bde
5 changed files with 126 additions and 97 deletions
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56
src/backend/access/transam/twophase.c
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@@ -910,23 +910,7 @@ TwoPhaseGetDummyProc(TransactionId xid, bool lock_held)
*/
#define TWOPHASE_MAGIC 0x57F94534 /* format identifier */
typedef struct TwoPhaseFileHeader
{
uint32 magic; /* format identifier */
uint32 total_len; /* actual file length */
TransactionId xid; /* original transaction XID */
Oid database; /* OID of database it was in */
TimestampTz prepared_at; /* time of preparation */
Oid owner; /* user running the transaction */
int32 nsubxacts; /* number of following subxact XIDs */
int32 ncommitrels; /* number of delete-on-commit rels */
int32 nabortrels; /* number of delete-on-abort rels */
int32 ninvalmsgs; /* number of cache invalidation messages */
bool initfileinval; /* does relcache init file need invalidation? */
uint16 gidlen; /* length of the GID - GID follows the header */
XLogRecPtr origin_lsn; /* lsn of this record at origin node */
TimestampTz origin_timestamp; /* time of prepare at origin node */
} TwoPhaseFileHeader;
typedef xl_xact_prepare TwoPhaseFileHeader;
/*
* Header for each record in a state file
@@ -1331,44 +1315,6 @@ ReadTwoPhaseFile(TransactionId xid, bool missing_ok)
return buf;
}
/*
* ParsePrepareRecord
*/
void
ParsePrepareRecord(uint8 info, char *xlrec, xl_xact_parsed_prepare *parsed)
{
TwoPhaseFileHeader *hdr;
char *bufptr;
hdr = (TwoPhaseFileHeader *) xlrec;
bufptr = xlrec + MAXALIGN(sizeof(TwoPhaseFileHeader));
parsed->origin_lsn = hdr->origin_lsn;
parsed->origin_timestamp = hdr->origin_timestamp;
parsed->twophase_xid = hdr->xid;
parsed->dbId = hdr->database;
parsed->nsubxacts = hdr->nsubxacts;
parsed->nrels = hdr->ncommitrels;
parsed->nabortrels = hdr->nabortrels;
parsed->nmsgs = hdr->ninvalmsgs;
strncpy(parsed->twophase_gid, bufptr, hdr->gidlen);
bufptr += MAXALIGN(hdr->gidlen);
parsed->subxacts = (TransactionId *) bufptr;
bufptr += MAXALIGN(hdr->nsubxacts * sizeof(TransactionId));
parsed->xnodes = (RelFileNode *) bufptr;
bufptr += MAXALIGN(hdr->ncommitrels * sizeof(RelFileNode));
parsed->abortnodes = (RelFileNode *) bufptr;
bufptr += MAXALIGN(hdr->nabortrels * sizeof(RelFileNode));
parsed->msgs = (SharedInvalidationMessage *) bufptr;
bufptr += MAXALIGN(hdr->ninvalmsgs * sizeof(SharedInvalidationMessage));
}
/*
* Reads 2PC data from xlog. During checkpoint this data will be moved to