diff --git a/pkg/common/helper.go b/pkg/common/helper.go
index cefd327..2c7cc6f 100644
--- a/pkg/common/helper.go
+++ b/pkg/common/helper.go
@@ -35,7 +35,12 @@ func getFunctionName(fn interface{}) string {
 	return runtime.FuncForPC(reflect.ValueOf(fn).Pointer()).Name()
 }
 
-// give either retryInterval or backoff
+// RetryFunc give either retryInterval or backoff
+// gets fn func(int) (bool, error, int) as parameter
+// which returns:
+// bool - whether should be retried
+// error - whether error happened
+// int - increments retries (allows manage retries count from inside of this function)
 func RetryFunc(ctx context.Context,
 	loggerInstance logger.Logger,
 	attempts int,
@@ -189,10 +194,11 @@ func EngineErrorIsNonFatal(err error) bool {
 
 func EngineErrorIsFatal(err error) bool {
 	var fatalEngineErrorsPartialMatch = []string{
-		"Failed to fetch record batches",
+		"lookup v3io-webapi: i/o timeout",
 	}
 	return errorMatches(err, fatalEngineErrorsPartialMatch)
 }
+
 func errorMatches(err error, substrings []string) bool {
 	if err != nil && len(err.Error()) > 0 {
 		for _, substring := range substrings {
diff --git a/pkg/dataplane/streamconsumergroup/claim.go b/pkg/dataplane/streamconsumergroup/claim.go
index 003b10d..dd8ef9f 100644
--- a/pkg/dataplane/streamconsumergroup/claim.go
+++ b/pkg/dataplane/streamconsumergroup/claim.go
@@ -126,7 +126,8 @@ func (c *claim) fetchRecordBatches(stopChannel chan struct{}, fetchInterval time
 		c.logger,
 		c.getShardLocationAttempts,
 		nil,
-		&c.getShardLocationBackoff, func(attempt int) (bool, error, int) {
+		&c.getShardLocationBackoff,
+		func(attempt int) (bool, error, int) {
 			c.currentShardLocation, err = c.getCurrentShardLocation(c.shardID)
 			if err != nil {
 				if common.EngineErrorIsNonFatal(err) {