support controlling archive to read from

cmd/mt-store-cat/main.go

@@ -37,6 +37,7 @@ var (
 	printTs     = flag.Bool("print-ts", false, "print time stamps instead of formatted dates. only for points and point-summary format")
 	groupTTL    = flag.String("groupTTL", "d", "group chunks in TTL buckets: s (second. means unbucketed), m (minute), h (hour) or d (day). only for chunk-summary format")
 	timeZoneStr = flag.String("time-zone", "local", "time-zone to use for interpreting from/to when needed. (check your config)")
+	archiveStr  = flag.String("archive", "", "archive to fetch for given metric. e.g. 'sum_1800'")
 	verbose     bool
 
 	printTime func(ts uint32) string
@@ -196,6 +197,14 @@ func main() {
 		log.Fatalf("failed to read tables from cassandra. %s", err.Error())
 	}
 
+	var archive schema.Archive
+	if *archiveStr != "" {
+		archive, err = schema.ArchiveFromString(*archiveStr)
+		if err != nil {
+			log.Fatalf("could not parse archive %q: %s", *archiveStr, err)
+		}
+	}
+
 	// set up is done, now actually execute the business logic
 
 	// handle "tables"
@@ -243,7 +252,7 @@ func main() {
 		// chunk-summary doesn't need an explicit listing. it knows if metrics is empty, to query all
 		// but the other two do need an explicit listing.
 		if format == "points" || format == "point-summary" {
-			metrics, err = getMetrics(store, "", "", "")
+			metrics, err = getMetrics(store, "", "", "", archive)
 			if err != nil {
 				log.Errorf("cassandra query error. %s", err.Error())
 				return
@@ -263,7 +272,7 @@ func main() {
 		if verbose {
 			fmt.Println("# Looking for these metrics:")
 		}
-		metrics, err = getMetrics(store, prefix, substr, glob)
+		metrics, err = getMetrics(store, prefix, substr, glob, archive)
 		if err != nil {
 			log.Errorf("cassandra query error. %s", err.Error())
 			return

cmd/mt-store-cat/metrics.go

@@ -50,7 +50,7 @@ func match(prefix, substr, glob string, metric Metric) bool {
 }
 
 // getMetrics lists all metrics from the store matching the given condition.
-func getMetrics(store *cassandra.CassandraStore, prefix, substr, glob string) ([]Metric, error) {
+func getMetrics(store *cassandra.CassandraStore, prefix, substr, glob string, archive schema.Archive) ([]Metric, error) {
 	var metrics []Metric
 	iter := store.Session.Query("select id, name from metric_idx").Iter()
 	var m Metric
@@ -62,7 +62,8 @@ func getMetrics(store *cassandra.CassandraStore, prefix, substr, glob string) ([
 				panic(err)
 			}
 			m.AMKey = schema.AMKey{
-				MKey: mkey,
+				MKey:    mkey,
+				Archive: archive,
 			}
 			metrics = append(metrics, m)
 		}

docs/tools.md

@@ -347,6 +347,8 @@ mt-store-cat -cassandra-keyspace metrictank -from='-1month' '*' 'prefix:fake' po
 mt-store-cat -cassandra-keyspace metrictank '*' 'prefix:fake' chunk-summary
 mt-store-cat -groupTTL h -cassandra-keyspace metrictank 'metric_512' '1.37cf8e3731ee4c79063c1d55280d1bbe' chunk-summary
 Flags:
+  -archive string
+    	archive to fetch for given metric. e.g. 'sum_1800'
   -cassandra-addrs string
     	cassandra host (may be given multiple times as comma-separated list) (default "localhost")
   -cassandra-auth