Error opening view group

Loading data through 10 different threads and querying 5 design docs, and suddenly a host went down and auto rebalance failed. Seeing several view_merge errors, although I'm not sure if these are symptoms of one of the nodes being unavailable - or the cause.

----LOGS----

Error opening view group `_design/dev_test_view-ui_engs` from bucket `default`: {throw,
{file_already_opened,
"/opt/couchbase/var/lib/couchdb/set_view_default_design/main_a944cebd58240eb7ec91a889e68f3e7d.view"}}
[

{couch_set_view,get_group_server,2}

,

{couch_set_view,get_group_info,2}

,

{couchbase_compaction_daemon,maybe_compact_view,3}

,

{couchbase_compaction_daemon,maybe_compact_views,3}

,

{couchbase_compaction_daemon,maybe_compact_bucket,3}

,

{lists,map,2}

,

{couchbase_compaction_daemon,compact_loop,1}

,

{proc_lib,init_p,3}

]
[error_logger:error] [2012-03-06 10:46:51] [ns_1@10.2.2.31:error_logger:ale_error_logger_handler:log_report:72]
=========================CRASH REPORT=========================
crasher:
initial call: couch_set_view_group:init/1
pid: <0.10645.4>
registered_name: []
exception exit:

{file_already_opened, "/opt/couchbase/var/lib/couchdb/set_view_default_design/main_a944cebd58240eb7ec91a889e68f3e7d.view"}

in function couch_set_view_group:init/1
ancestors: [<0.10644.4>]
messages: [

{'EXIT',<0.10646.4>,normal}

]
links: [<0.10644.4>]
dictionary: [{random_seed,{27839,21123,25074}}]
trap_exit: true
status: running
heap_size: 1597
stack_size: 24
reductions: 955
neighbours:

=========================CRASH REPORT=========================
crasher:
initial call: couchbase_compaction_daemon:init/1
pid: <0.397.0>
registered_name: couchbase_compaction_daemon
exception exit: {compaction_loop_died,
{shutdown,

{gen_server,call, [<0.22487.0>,start_compact,infinity]}

}}
in function gen_server:terminate/6
ancestors: [<0.392.0>,ns_server_sup,ns_server_cluster_sup,<0.60.0>]
messages: []