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knownrecoverystate.patch

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Filename: knownrecoverystate.patch
Type: text/x-patch
Part: 0
Message: Re: testing HS/SR - 1 vs 2 performance

Patch

Same data as JSON: GET /api/v1/attachments/:id/patch the parsed metadata as JSON — format, series position, per-file stats; never the diff bytes. API reference →
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src/backend/access/transam/xlog.c 6 0 
*** a/src/backend/access/transam/xlog.c
--- b/src/backend/access/transam/xlog.c
***************
*** 158,163 **** static XLogRecPtr LastRec;
--- 158,164 ----
   * known, need to check the shared state".
   */
  static bool LocalRecoveryInProgress = true;
+ static bool KnownRecoveryState = false;
  
  /*
   * Local state for XLogInsertAllowed():
***************
*** 6524,6537 **** CheckRecoveryConsistency(void)
  bool
  RecoveryInProgress(void)
  {
! 	/*
! 	 * We check shared state each time only until we leave recovery mode. We
! 	 * can't re-enter recovery, so there's no need to keep checking after the
! 	 * shared variable has once been seen false.
! 	 */
! 	if (!LocalRecoveryInProgress)
! 		return false;
! 	else
  	{
  		/* use volatile pointer to prevent code rearrangement */
  		volatile XLogCtlData *xlogctl = XLogCtl;
--- 6525,6533 ----
  bool
  RecoveryInProgress(void)
  {
! 	if (KnownRecoveryState)
! 		return LocalRecoveryInProgress;
! 	else		
  	{
  		/* use volatile pointer to prevent code rearrangement */
  		volatile XLogCtlData *xlogctl = XLogCtl;
***************
*** 6541,6546 **** RecoveryInProgress(void)
--- 6537,6544 ----
  		LocalRecoveryInProgress = xlogctl->SharedRecoveryInProgress;
  		SpinLockRelease(&xlogctl->info_lck);
  
+ 		KnownRecoveryState = true;
+ 
  		/*
  		 * Initialize TimeLineID and RedoRecPtr when we discover that recovery
  		 * is finished. InitPostgres() relies upon this behaviour to ensure