[windows] Commit failure and retry caused memcached to exit with 255, which in turn caused rebalance failure

to reproduce: rebalancetests.IncrementalRebalanceOut.test_load,replica=2,do-stop=True

2012-11-21 06:50:12.180 ns_orchestrator:4:info:message(ns_1@10.1.3.82) - Starting rebalance, KeepNodes = ['ns_1@10.1.3.84','ns_1@10.1.3.85',
'ns_1@10.1.3.82'], EjectNodes = ['ns_1@10.1.3.87']
2012-11-21 06:54:27.902 ns_memcached:4:info:message(ns_1@10.1.3.84) - Control connection to memcached on 'ns_1@10.1.3.84' disconnected: {{badmatch,
{error,
closed}},
[

{mc_client_binary, cmd_binary_vocal_recv, 5}

,

{mc_client_binary, select_bucket, 2}

,

{ns_memcached, ensure_bucket, 2}

,

{ns_memcached, handle_info, 2}

,

{gen_server, handle_msg, 5}

,

{proc_lib, init_p_do_apply, 3}

]}
2012-11-21 06:54:33.024 ns_orchestrator:2:info:message(ns_1@10.1.3.82) - Rebalance exited with reason {{bulk_set_vbucket_state_failed,
[{'ns_1@10.1.3.84',
{'EXIT',
{{badmatch,{error,closed,
[

{mc_client_binary, cmd_binary_vocal_recv,5}

,

{mc_client_binary,select_bucket,2}

,

{ns_memcached,ensure_bucket,2}

,

{ns_memcached,handle_info,2}

,

{gen_server,handle_msg,5},
{proc_lib,init_p_do_apply,3}]},
{gen_server,call,
['ns_memcached-bucket-0',
{set_vbucket,484,replica},
180000]}},
{gen_server,call,
[{'janitor_agent-bucket-0', 'ns_1@10.1.3.84'},
{if_rebalance,<0.7929.47>,
{update_vbucket_state,484,replica,
undefined,'ns_1@10.1.3.85'}},
infinity]}}}},
{'ns_1@10.1.3.82',
{'EXIT',
{{{{unexpected_reason,
badmatch,{error,closed,
[{mc_binary,quick_stats_recv,3},
{mc_binary,quick_stats_loop,5},
{mc_binary,quick_stats,5},
{mc_client_binary, get_zero_open_checkpoint_vbuckets,3},
{ebucketmigrator_srv,handle_call,3},
{gen_server,handle_msg,5}

,

{proc_lib,init_p_do_apply,3}]}},
[{misc,executing_on_new_process,1},
{tap_replication_manager, change_vbucket_filter,4},
{tap_replication_manager, '-do_set_incoming_replication_map/3-lc$^5/1-5-', 2},
{tap_replication_manager, do_set_incoming_replication_map,3},
{tap_replication_manager,handle_call,3},
{gen_server,handle_msg,5},
{proc_lib,init_p_do_apply,3}

]},
{gen_server,call,
['tap_replication_manager-bucket-0',

{change_vbucket_replication,484, 'ns_1@10.1.3.84'}

,
infinity]}},
{gen_server,call,
[

{'janitor_agent-bucket-0', 'ns_1@10.1.3.82'}

,
{if_rebalance,<0.7929.47>,
{update_vbucket_state,484,replica,
undefined,'ns_1@10.1.3.84'}},
infinity]}}}}]},
[

{janitor_agent,bulk_set_vbucket_state,4}

,

{ns_vbucket_mover, update_replication_post_move,3}

,

{ns_vbucket_mover,handle_info,2}

,

{gen_server,handle_msg,5}

,

{proc_lib,init_p_do_apply,3}

]}

attaching logs