From 0900a1dbcc3759b8984890ed9e4e83f0deec58c8 Mon Sep 17 00:00:00 2001
From: Michael Schurter <schmichael@hashicorp.com>
Date: Mon, 2 Apr 2018 16:39:18 -0700
Subject: [PATCH] drain: fix double-close panic on drain future

---
 nomad/drainer/drainer.go | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/nomad/drainer/drainer.go b/nomad/drainer/drainer.go
index db345a2ee..b7c7ddf00 100644
--- a/nomad/drainer/drainer.go
+++ b/nomad/drainer/drainer.go
@@ -6,6 +6,7 @@ import (
 	"sync"
 	"time"
 
+	multierror "github.com/hashicorp/go-multierror"
 	"github.com/hashicorp/nomad/helper"
 	"github.com/hashicorp/nomad/helper/uuid"
 	"github.com/hashicorp/nomad/nomad/state"
@@ -399,11 +400,12 @@ func (n *NodeDrainer) drainAllocs(future *structs.BatchFuture, allocs []*structs
 	var finalIndex uint64
 	for _, u := range partitionAllocDrain(transistions, evals) {
 		index, err := n.raft.AllocUpdateDesiredTransition(u.Transistions, u.Evals)
+	var mErr multierror.Error
 		if err != nil {
-			future.Respond(index, err)
+			mErr.Errors = append(mErr.Errors, err)
 		}
 		finalIndex = index
 	}
 
-	future.Respond(finalIndex, nil)
+	future.Respond(finalIndex, mErr.ErrorOrNil())
 }