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Optimize fileset usage in apply worker.

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Use one fileset for the entire worker lifetime instead of using
separate filesets for each streaming transaction. Now, the
changes/subxacts files for every streaming transaction will be
created under the same fileset and the files will be deleted
after the transaction is completed.

This patch extends the BufFileOpenFileSet and BufFileDeleteFileSet
APIs to allow users to specify whether to give an error on missing
files.

Author: Dilip Kumar, based on suggestion by Thomas Munro
Reviewed-by: Hou Zhijie, Masahiko Sawada, Amit Kapila
Discussion: https://postgr.es/m/E1mCC6U-0004Ik-Fs@gemulon.postgresql.org
This commit is contained in:
Amit Kapila
2021-09-02 08:13:46 +05:30
parent 163074ea84
commit 31c389d8de
7 changed files with 86 additions and 219 deletions
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10
src/include/replication/worker_internal.h
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@@ -50,6 +50,15 @@ typedef struct LogicalRepWorker
XLogRecPtr relstate_lsn;
slock_t relmutex;
/*
* Used to create the changes and subxact files for the streaming
* transactions. Upon the arrival of the first streaming transaction, the
* fileset will be initialized, and it will be deleted when the worker
* exits. Under this, separate buffiles would be created for each
* transaction which will be deleted after the transaction is finished.
*/
FileSet *stream_fileset;
/* Stats. */
XLogRecPtr last_lsn;
TimestampTz last_send_time;
@@ -79,7 +88,6 @@ extern void logicalrep_worker_launch(Oid dbid, Oid subid, const char *subname,
extern void logicalrep_worker_stop(Oid subid, Oid relid);
extern void logicalrep_worker_wakeup(Oid subid, Oid relid);
extern void logicalrep_worker_wakeup_ptr(LogicalRepWorker *worker);
extern void logicalrep_worker_cleanupfileset(void);
extern int logicalrep_sync_worker_count(Oid subid);