NEON: Finish Zenith->Neon rename

Even though we're now part of Databricks, let's at least make this part
consistent.

Author: MMeent

src/backend/access/transam/xlog.c

@@ -679,11 +679,11 @@ static MemoryContext walDebugCxt = NULL;
 
 
 /*
- * Variables read from 'zenith.signal' file.
+ * Variables read from 'neon.signal' file.
  */
-bool		ZenithRecoveryRequested = false;
-XLogRecPtr	zenithLastRec = InvalidXLogRecPtr;
-bool		zenithWriteOk = false;
+bool		NeonRecoveryRequested = false;
+XLogRecPtr	neonLastRec = InvalidXLogRecPtr;
+bool		neonWriteOk = false;
 
 
 static void CleanupAfterArchiveRecovery(TimeLineID EndOfLogTLI,
@@ -5439,42 +5439,42 @@ CheckRequiredParameterValues(void)
 }
 
 static void
-readZenithSignalFile(void)
+readNeonSignalFile(void)
 {
 	int			fd;
 
-	fd = BasicOpenFile(ZENITH_SIGNAL_FILE, O_RDONLY | PG_BINARY);
+	fd = BasicOpenFile(NEON_SIGNAL_FILE, O_RDONLY | PG_BINARY);
 	if (fd >= 0)
 	{
 		struct stat statbuf;
 		char	   *content;
 		char		prev_lsn_str[20];
 
 		/* Slurp the file into a string */
-		if (stat(ZENITH_SIGNAL_FILE, &statbuf) != 0)
+		if (stat(NEON_SIGNAL_FILE, &statbuf) != 0)
 			ereport(ERROR,
 					(errcode_for_file_access(),
 					 errmsg("could not stat file \"%s\": %m",
-							ZENITH_SIGNAL_FILE)));
+							NEON_SIGNAL_FILE)));
 		content = palloc(statbuf.st_size + 1);
 		if (read(fd, content, statbuf.st_size) != statbuf.st_size)
 			ereport(ERROR,
 					(errcode_for_file_access(),
 					 errmsg("could not read file \"%s\": %m",
-							ZENITH_SIGNAL_FILE)));
+							NEON_SIGNAL_FILE)));
 		content[statbuf.st_size] = '\0';
 
 		/* Parse it */
 		if (sscanf(content, "PREV LSN: %19s", prev_lsn_str) != 1)
 			ereport(ERROR,
 					(errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
-					 errmsg("invalid data in file \"%s\"", ZENITH_SIGNAL_FILE)));
+					 errmsg("invalid data in file \"%s\"", NEON_SIGNAL_FILE)));
 
 		if (strcmp(prev_lsn_str, "invalid") == 0)
 		{
 			/* No prev LSN. Forbid starting up in read-write mode */
-			zenithLastRec = InvalidXLogRecPtr;
-			zenithWriteOk = false;
+			neonLastRec = InvalidXLogRecPtr;
+			neonWriteOk = false;
 		}
 		else if (strcmp(prev_lsn_str, "none") == 0)
 		{
@@ -5483,8 +5483,8 @@ readZenithSignalFile(void)
 			 * to start without it. This happens when you start the compute
 			 * node for the first time on a new branch.
 			 */
-			zenithLastRec = InvalidXLogRecPtr;
-			zenithWriteOk = true;
+			neonLastRec = InvalidXLogRecPtr;
+			neonWriteOk = true;
 		}
 		else
 		{
@@ -5494,22 +5494,22 @@ readZenithSignalFile(void)
 			if (sscanf(prev_lsn_str, "%X/%X", &hi, &lo) != 2)
 				ereport(ERROR,
 						(errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
-						 errmsg("invalid data in file \"%s\"", ZENITH_SIGNAL_FILE)));
-			zenithLastRec = ((uint64) hi) << 32 | lo;
+						 errmsg("invalid data in file \"%s\"", NEON_SIGNAL_FILE)));
+			neonLastRec = ((uint64) hi) << 32 | lo;
 
 			/* If prev LSN is given, it better be valid */
-			if (zenithLastRec == InvalidXLogRecPtr)
+			if (neonLastRec == InvalidXLogRecPtr)
 				ereport(ERROR,
 						(errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
-						 errmsg("invalid prev-LSN in file \"%s\"", ZENITH_SIGNAL_FILE)));
-			zenithWriteOk = true;
+						 errmsg("invalid prev-LSN in file \"%s\"", NEON_SIGNAL_FILE)));
+			neonWriteOk = true;
 		}
-		ZenithRecoveryRequested = true;
+		NeonRecoveryRequested = true;
 		close(fd);
 
 		elog(LOG,
-			 "[ZENITH] found 'zenith.signal' file. setting prev LSN to %X/%X",
-			 LSN_FORMAT_ARGS(zenithLastRec));
+			 "[NEON] found 'neon.signal' file. setting prev LSN to %X/%X",
+			 LSN_FORMAT_ARGS(neonLastRec));
 	}
 }
 
@@ -5545,14 +5545,14 @@ StartupXLOG(void)
 	CurrentResourceOwner = AuxProcessResourceOwner;
 
 	/*
-	 * Read zenith.signal before anything else.
+	 * Read neon.signal before anything else.
 	 */
-	readZenithSignalFile();
+	readNeonSignalFile();
 
 	/*
 	 * Check that contents look valid.
 	 */
-	if (!XRecOffIsValid(ControlFile->checkPoint) && !ZenithRecoveryRequested)
+	if (!XRecOffIsValid(ControlFile->checkPoint) && !NeonRecoveryRequested)
 		ereport(FATAL,
 				(errcode(ERRCODE_DATA_CORRUPTED),
 				 errmsg("control file contains invalid checkpoint location")));

src/backend/access/transam/xlogrecovery.c

@@ -762,18 +762,18 @@ InitWalRecovery(ControlFileData *ControlFile, bool *wasShutdown_ptr,
 		/* tell the caller to delete it later */
 		haveBackupLabel = true;
 	}
-	else if (ZenithRecoveryRequested)
+	else if (NeonRecoveryRequested)
 	{
 		/*
-		 * Zenith hacks to spawn compute node without WAL.  Pretend that we
-		 * just finished reading the record that started at 'zenithLastRec'
+		 * Neon hacks to spawn compute node without WAL.  Pretend that we
+		 * just finished reading the record that started at 'neonLastRec'
 		 * and ended at checkpoint.redo
 		 */
-		elog(LOG, "starting with zenith basebackup at LSN %X/%X, prev %X/%X",
+		elog(LOG, "starting with neon basebackup at LSN %X/%X, prev %X/%X",
 			 LSN_FORMAT_ARGS(ControlFile->checkPointCopy.redo),
-			 LSN_FORMAT_ARGS(zenithLastRec));
+			 LSN_FORMAT_ARGS(neonLastRec));
 
-		CheckPointLoc = zenithLastRec;
+		CheckPointLoc = neonLastRec;
 		CheckPointTLI = ControlFile->checkPointCopy.ThisTimeLineID;
 		RedoStartLSN = ControlFile->checkPointCopy.redo;
 		// FIXME needs review. rebase of ff41b709abea6a9c42100a4fcb0ff434b2c846c9
@@ -935,9 +935,9 @@ InitWalRecovery(ControlFileData *ControlFile, bool *wasShutdown_ptr,
 		else if (recoveryTarget == RECOVERY_TARGET_IMMEDIATE)
 			ereport(LOG,
 					(errmsg("starting point-in-time recovery to earliest consistent point")));
-		else if (ZenithRecoveryRequested)
+		else if (NeonRecoveryRequested)
 			ereport(LOG,
-					(errmsg("starting zenith recovery")));
+					(errmsg("starting neon recovery")));
 		else
 			ereport(LOG,
 					(errmsg("starting archive recovery")));
@@ -1008,7 +1008,7 @@ InitWalRecovery(ControlFileData *ControlFile, bool *wasShutdown_ptr,
 				(errmsg("invalid next transaction ID")));
 
 	/* sanity check */
-	if (checkPoint.redo > CheckPointLoc && !ZenithRecoveryRequested)
+	if (checkPoint.redo > CheckPointLoc && !NeonRecoveryRequested)
 		ereport(PANIC,
 				(errmsg("invalid redo in checkpoint record")));
 
@@ -1635,7 +1635,7 @@ FinishWalRecovery(void)
 		lastRecTLI = XLogRecoveryCtl->lastReplayedTLI;
 	}
 
-	if (!ZenithRecoveryRequested)
+	if (!NeonRecoveryRequested)
 	{
 		XLogPrefetcherBeginRead(xlogprefetcher, lastRec);
 		(void) ReadRecord(xlogprefetcher, PANIC, false, lastRecTLI);
@@ -1675,13 +1675,13 @@ FinishWalRecovery(void)
 	}
 
 	/*
-	 * When starting from a zenith base backup, we don't have WAL. Initialize
+	 * When starting from a neon base backup, we don't have WAL. Initialize
 	 * the WAL page where we will start writing new records from scratch,
 	 * instead.
 	 */
-	if (ZenithRecoveryRequested)
+	if (NeonRecoveryRequested)
 	{
-		if (!zenithWriteOk)
+		if (!neonWriteOk)
 		{
 			/*
 			 * We cannot start generating new WAL if we don't have a valid prev-LSN
@@ -1727,7 +1727,7 @@ FinishWalRecovery(void)
 			result->lastPage = page;
 			elog(LOG, "Continue writing WAL at %X/%X", LSN_FORMAT_ARGS(xlogreader->EndRecPtr));
 
-			// FIXME: should we unlink zenith.signal?
+			// FIXME: should we unlink neon.signal?
 		}
 	}
 
@@ -1787,7 +1787,7 @@ ShutdownWalRecovery(void)
 	char		recoveryPath[MAXPGPATH];
 
 	/* Final update of pg_stat_recovery_prefetch. */
-	if (!ZenithRecoveryRequested)
+	if (!NeonRecoveryRequested)
 	{
 		XLogPrefetcherComputeStats(xlogprefetcher);
 	}
@@ -1800,7 +1800,7 @@ ShutdownWalRecovery(void)
 	}
 	XLogReaderFree(xlogreader);
 
-	if (!ZenithRecoveryRequested)
+	if (!NeonRecoveryRequested)
 	{
 		XLogPrefetcherFree(xlogprefetcher);
 	}
@@ -1904,7 +1904,7 @@ PerformWalRecovery(void)
 	else
 	{
 		/* just have to read next record after CheckPoint */
-		if (ZenithRecoveryRequested)
+		if (NeonRecoveryRequested)
 			xlogreader->ReadRecPtr = CheckPointLoc;
 		else
 			Assert(xlogreader->ReadRecPtr == CheckPointLoc);

src/backend/commands/sequence.c

@@ -55,7 +55,7 @@
  * so we pre-log a few fetches in advance. In the event of
  * crash we can lose (skip over) as many values as we pre-logged.
  */
-/* NEON XXX: to ensure sequence order of sequence in Zenith we need to WAL log each sequence update. */
+/* NEON XXX: to ensure sequence order of sequence in Neon we need to WAL log each sequence update. */
 /* #define SEQ_LOG_VALS	32 */
 #define SEQ_LOG_VALS	0
 

src/backend/replication/walsender.c

@@ -3540,7 +3540,7 @@ WalSndDone(WalSndSendDataCallback send_data)
 	 * flush location if valid, write otherwise. Tools like pg_receivewal will
 	 * usually (unless in synchronous mode) return an invalid flush location.
 	 */
-	// XXX Zenith uses flush_lsn to pass extra payload, so use write_lsn here
+	// XXX Neon uses flush_lsn to pass extra payload, so use write_lsn here
 	replicatedPtr = MyWalSnd->write;
 
 	if (WalSndCaughtUp && sentPtr == replicatedPtr &&

src/backend/storage/buffer/bufmgr.c

@@ -173,7 +173,7 @@ int			bgwriter_flush_after = DEFAULT_BGWRITER_FLUSH_AFTER;
 int			backend_flush_after = DEFAULT_BACKEND_FLUSH_AFTER;
 
 /* Evict unpinned pages (for better test coverage) */
-bool		zenith_test_evict = false;
+bool		neon_test_evict = false;
 
 
 /* local state for LockBufferForCleanup */
@@ -2892,7 +2892,7 @@ UnpinBufferNoOwner(BufferDesc *buf)
 		}
 		ForgetPrivateRefCountEntry(ref);
 
-		if (zenith_test_evict && !InRecovery)
+		if (neon_test_evict && !InRecovery)
 		{
 			buf_state = LockBufHdr(buf);
 			if ((buf_state & BM_VALID) && BUF_STATE_GET_REFCOUNT(buf_state) == 0)

src/backend/storage/buffer/localbuf.c

@@ -205,7 +205,7 @@ GetLocalVictimBuffer(void)
 		{
 			if (-victim_bufid - 1 == wal_redo_buffer)
 			{
-				/* ZENITH: Prevent eviction of the buffer with target wal redo page */
+				/* NEON: Prevent eviction of the buffer with target wal redo page */
 				continue;
 			}
 

src/backend/utils/misc/guc_tables.c

@@ -2062,7 +2062,7 @@ struct config_bool ConfigureNamesBool[] =
 		{"neon_test_evict", PGC_POSTMASTER, UNGROUPED,
 			gettext_noop("Evict unpinned pages (for better test coverage)"),
 		},
-		&zenith_test_evict,
+		&neon_test_evict,
 		false,
 		NULL, NULL, NULL
 	},

src/include/access/xlog.h

@@ -41,9 +41,9 @@ extern PGDLLIMPORT XLogRecPtr XactLastCommitEnd;
  */
 #define REL_METADATA_PSEUDO_BLOCKNO InvalidBlockNumber
 
-extern bool			ZenithRecoveryRequested;
-extern XLogRecPtr	zenithLastRec;
-extern bool			zenithWriteOk;
+extern bool			NeonRecoveryRequested;
+extern XLogRecPtr	neonLastRec;
+extern bool			neonWriteOk;
 
 /* these variables are GUC parameters related to XLOG */
 extern PGDLLIMPORT int wal_segment_size;
@@ -341,7 +341,7 @@ extern restore_running_xacts_callback_t restore_running_xacts_callback;
 #define TABLESPACE_MAP			"tablespace_map"
 #define TABLESPACE_MAP_OLD		"tablespace_map.old"
 
-#define ZENITH_SIGNAL_FILE		"zenith.signal"
+#define NEON_SIGNAL_FILE		"neon.signal"
 
 /* files to signal promotion to primary */
 #define PROMOTE_SIGNAL_FILE		"promote"

src/include/storage/bufmgr.h

@@ -173,7 +173,7 @@ extern PGDLLIMPORT int checkpoint_flush_after;
 extern PGDLLIMPORT int backend_flush_after;
 extern PGDLLIMPORT int bgwriter_flush_after;
 
-extern bool	zenith_test_evict;
+extern bool	neon_test_evict;
 
 /* in buf_init.c */
 extern PGDLLIMPORT char *BufferBlocks;