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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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19
src/include/access/xact.h
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@ -292,6 +292,24 @@ typedef struct xl_xact_abort
} xl_xact_abort;
#define MinSizeOfXactAbort sizeof(xl_xact_abort)
typedef struct xl_xact_prepare
{
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 */
} xl_xact_prepare;
/*
* Commit/Abort records in the above form are a bit verbose to parse, so
* there's a deconstructed versions generated by ParseCommit/AbortRecord() for
@ -435,6 +453,7 @@ extern const char *xact_identify(uint8 info);
/* also in xactdesc.c, so they can be shared between front/backend code */
extern void ParseCommitRecord(uint8 info, xl_xact_commit *xlrec, xl_xact_parsed_commit *parsed);
extern void ParseAbortRecord(uint8 info, xl_xact_abort *xlrec, xl_xact_parsed_abort *parsed);
extern void ParsePrepareRecord(uint8 info, xl_xact_prepare *xlrec, xl_xact_parsed_prepare *parsed);
extern void EnterParallelMode(void);
extern void ExitParallelMode(void);