closed memcached connection causing compacter to exit unexpectedly

Compactor for vbucket `default/986` (pid [{type,vbucket},

                                          {name,<<"default/986">>},

                                          {important,false},

                                          {fa,

                                           {#Fun<compaction_new_daemon.13.102846360>,

                                            [<<"default">>,

                                             {986,<<"default/986">>},

                                             {config,

                                              {30,undefined},

                                              {30,undefined},

                                              undefined,false,false,

                                              {daemon_config,30,131072,

                                               20971520}},

                                             false,

                                             {1471025460,720653,false}]}}]) 

...

=========================CRASH REPORT=========================

  crasher:

    initial call: compaction_new_daemon:-spawn_vbucket_compactor/5-fun-0-/0

    pid: <0.17618.339>

    registered_name: []

    exception error: no match of right hand side value {error,closed}

      in function  mc_client_binary:cmd_vocal_recv/5 (src/mc_client_binary.erl, line 156)

      in call from mc_client_binary:compact_vbucket/5 (src/mc_client_binary.erl, line 406)

      in call from ns_memcached:'-compact_vbucket/3-fun-0-'/5 (src/ns_memcached.erl, line 1514)

      in call from ns_memcached:'-perform_very_long_call/2-fun-0-'/2 (src/ns_memcached.erl, line 322)

      in call from misc:'-executing_on_new_process/1-fun-0-'/3 (src/misc.erl, line 1555)

    ancestors: [<0.15285.339>,<0.15275.339>,<0.14956.339>,<0.14953.339>,

                  <0.14979.339>,compaction_new_daemon,ns_server_sup,

                  ns_server_nodes_sup,<0.12782.335>,ns_server_cluster_sup,

                  <0.89.0>]