On Fri, Sep 22, 2017 at 11:34 AM, Masahiko Sawada <sawada.mshk@gmail.com> wrote:
> You're right. I updated the patch so that it exits do_pg_abort_backup
> if the state is NONE and setting the state to NONE in
> do_pg_stop_backup before releasing the WAL insert lock.
- /* Clean up session-level lock */
+ /*
+ * Clean up session-level lock. To avoid interrupting before changing
+ * the backup state by LWLockWaitForVar we change it while holding the
+ * WAL insert lock.
+ */ sessionBackupState = SESSION_BACKUP_NONE;
You could just mention directly CHECK_FOR_INTERRUPTS here.
+ /* Quick exit if we have done the backup */
+ if (XLogCtl->Insert.exclusiveBackupState == EXCLUSIVE_BACKUP_NONE)
+ return;
The patch contents look fine to me. I have also tested things in
depths but could not find any problems. I also looked again at the
backup start code, trying to see any flows between the moment the
session backup lock is changed and the moment the callback to do
backup cleanup is registered but I have not found any issues. I am
marking this as ready for committer.
--
Michael
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