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Logical replication support for initial data copy

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Add functionality for a new subscription to copy the initial data in the
tables and then sync with the ongoing apply process.

For the copying, add a new internal COPY option to have the COPY source
data provided by a callback function.  The initial data copy works on
the subscriber by receiving COPY data from the publisher and then
providing it locally into a COPY that writes to the destination table.

A WAL receiver can now execute full SQL commands.  This is used here to
obtain information about tables and publications.

Several new options were added to CREATE and ALTER SUBSCRIPTION to
control whether and when initial table syncing happens.

Change pg_dump option --no-create-subscription-slots to
--no-subscription-connect and use the new CREATE SUBSCRIPTION
... NOCONNECT option for that.

Author: Petr Jelinek <petr.jelinek@2ndquadrant.com>
Tested-by: Erik Rijkers <er@xs4all.nl>
This commit is contained in:
Peter Eisentraut
2017-03-23 08:36:36 -04:00
parent 707576b571
commit 7c4f52409a
62 changed files with 2969 additions and 344 deletions
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5
src/include/commands/copy.h
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@@ -21,6 +21,7 @@
/* CopyStateData is private in commands/copy.c */
typedef struct CopyStateData *CopyState;
typedef int (*copy_data_source_cb) (void *outbuf, int minread, int maxread);
extern void DoCopy(ParseState *state, const CopyStmt *stmt,
int stmt_location, int stmt_len,
@@ -28,7 +29,7 @@ extern void DoCopy(ParseState *state, const CopyStmt *stmt,
extern void ProcessCopyOptions(ParseState *pstate, CopyState cstate, bool is_from, List *options);
extern CopyState BeginCopyFrom(ParseState *pstate, Relation rel, const char *filename,
bool is_program, List *attnamelist, List *options);
bool is_program, copy_data_source_cb data_source_cb, List *attnamelist, List *options);
extern void EndCopyFrom(CopyState cstate);
extern bool NextCopyFrom(CopyState cstate, ExprContext *econtext,
Datum *values, bool *nulls, Oid *tupleOid);
@@ -36,6 +37,8 @@ extern bool NextCopyFromRawFields(CopyState cstate,
char ***fields, int *nfields);
extern void CopyFromErrorCallback(void *arg);
extern uint64 CopyFrom(CopyState cstate);
extern DestReceiver *CreateCopyDestReceiver(void);
#endif /* COPY_H */