Issue 151

src/catalog.c

@@ -15,6 +15,7 @@
 #include <signal.h>
 #include <sys/stat.h>
 #include <unistd.h>
+#include <time.h>
 
 #include "utils/file.h"
 #include "utils/configuration.h"
@@ -1493,7 +1494,7 @@ catalog_get_timelines(InstanceConfig *instance)
 	}
 
 	/* determine which WAL segments must be kept because of wal retention */
-	if (instance->wal_depth <= 0)
+	if (instance->wal_depth <= 0 && instance->wal_window <= 0)
 		return timelineinfos;
 
 	/*
@@ -1559,8 +1560,15 @@ catalog_get_timelines(InstanceConfig *instance)
 	for (i = 0; i < parray_num(timelineinfos); i++)
 	{
 		int count = 0;
+		time_t days_threshold = current_time;
 		timelineInfo *tlinfo = parray_get(timelineinfos, i);
 
+		if (instance_config.wal_window > 0)
+		{
+		    days_threshold = current_time -
+		    (instance_config.wal_window * 60 * 60 * 24);
+		}
+
 		/*
 		 * Iterate backward on backups belonging to this timeline to find
 		 * anchor_backup. NOTE Here we rely on the fact that backups list
@@ -1597,7 +1605,9 @@ catalog_get_timelines(InstanceConfig *instance)
 
 				count++;
 
-				if (count == instance->wal_depth)
+				if (count >= instance->wal_depth &&
+					days_threshold >= backup->recovery_time)
+
 				{
 					elog(LOG, "On timeline %i WAL is protected from purge at %X/%X",
 						 tlinfo->tli,

src/configure.c

@@ -194,6 +194,11 @@ ConfigOption instance_options[] =
 		&instance_config.wal_depth, SOURCE_CMD, 0,
 		OPTION_RETENTION_GROUP, 0, option_get_value
 	},
+	{
+		'u', 231, "wal-window",
+		&instance_config.wal_window, SOURCE_CMD, 0,
+		OPTION_RETENTION_GROUP, 0, option_get_value
+	},
 	/* Compression options */
 	{
 		'f', 222, "compress-algorithm",
@@ -363,6 +368,7 @@ init_config(InstanceConfig *config, const char *instance_name)
 	config->retention_redundancy = RETENTION_REDUNDANCY_DEFAULT;
 	config->retention_window = RETENTION_WINDOW_DEFAULT;
 	config->wal_depth = 0;
+	config->wal_window = 0;
 
 	config->compress_alg = COMPRESS_ALG_DEFAULT;
 	config->compress_level = COMPRESS_LEVEL_DEFAULT;
@@ -541,6 +547,11 @@ readInstanceConfigFile(const char *instance_name)
 			&instance->wal_depth, SOURCE_CMD, 0,
 			OPTION_RETENTION_GROUP, 0, option_get_value
 		},
+		{
+			'u', 231, "wal-window",
+			&instance->wal_window, SOURCE_CMD, 0,
+			OPTION_RETENTION_GROUP, 0, option_get_value
+		},
 		/* Compression options */
 		{
 			's', 222, "compress-algorithm",

src/pg_probackup.h

@@ -384,6 +384,7 @@ typedef struct InstanceConfig
 	uint32		retention_redundancy;
 	uint32		retention_window;
 	uint32		wal_depth;
+	uint32		wal_window;
 
 	CompressAlg	compress_alg;
 	int			compress_level;