decrease max polling interval and add repeats to jobs logs polling

Author: sanfilip

lib/jobs/logs.js

@@ -73,10 +73,12 @@ function logs(params, cb) {
 	if (typeof params.line === 'undefined') params.line = 0;
 	else singleChunk = true; // if line is specified only a limited chunk will be returned; params.limit defines the limit; default is 2000
 	var backoff = 0;
+	var backoff_repeat = 0;
 	var allLogs;
 	if (!global.paperspace_cli || json) allLogs = [];
 
-	var MAX_BACKOFF_SECS = 30;
+	var MAX_BACKOFF_SECS = 5;
+	var BACKOFF_REPEATS = 10;
 
 	function _logs() {
 		return method(logs, params, function logsCb(err, data) {
@@ -87,11 +89,24 @@ function logs(params, cb) {
 				params.line = result.line;
 			}
 			if ((result.count > 0 || tail) && !result.eof && !singleChunk) {
-				if (result.count > 0) backoff = 0;
+				if (result.count > 0) {
+					backoff = 0;
+					backoff_repeat = 0;
+				}
 				else if (backoff < MAX_BACKOFF_SECS) {
 					// increase backoff geometrically
-					if (backoff === 0) backoff = 1;
-					else backoff *= 2;
+					if (backoff === 0) {
+						backoff = 0.2;
+						backoff_repeat = 0;
+					}
+					else if (backoff_repeat < BACKOFF_REPEATS) {
+						backoff_repeat += 1;
+					}
+					else {
+						backoff_repeat = 0;
+						if (backoff > 1 && backoff < 2) backoff = 1;
+						backoff *= 2;
+					}
 				}
 				else backoff = MAX_BACKOFF_SECS; // cap backoff at this