view errors ( ""Undefined set view `default`" ) and (Database `default/124` doesn't exist.") on 700k docs with 20+ design docs

I kept the load running on a cluster for 3 hour.
700k docs - 20 design docs - each client runs 1 view query using stale=update_after

Subset of nodes failed with the following error:
[

{ "from": "local", "reason": "Undefined set view `default` for `_design/dev_test_view_on_10k_docs-0e413a8` design document." }

]

Client-side error-report for user "Administrator" on node 'ns_1@10.212.167.16':
User-Agent:Mozilla/5.0 (Macintosh; Intel Mac OS X 10_7_2) AppleWebKit/535.7 (KHTML, like Gecko) Chrome/16.0.912.77 Safari/535.7
Subset of nodes failed with the following error:
[

{ "from": "local", "reason": "Database `default/124` doesn't exist." }

Server error during processing: ["web request failed",

{path, "/couchBase/default/_design/dev_test_view_on_10k_docs-024d78b/_view/dev_test_view_on_10k_docs-024d78b"}

,

{type,error}, {what,badarg},
{trace,
[{erlang,list_to_binary,
[[{couch_set_view,get_group_server,2}, {couch_set_view,get_group,3}, {couch_set_view,get_map_view,5}, {couch_view_merger,get_set_view,6}, {couch_view_merger,prepare_set_view,4}, {couch_view_merger,map_set_view_folder, 5}]]}, {couch_httpd,error_info,1}, {couch_httpd,send_error,2}, {couch_httpd,handle_request_int,6}, {menelaus_web,loop,3}, {mochiweb_http,headers,5}, {proc_lib,init_p_do_apply,3}]}] menelaus_web019 ns_1@10.212.167.16 20:04:00 - Sat Jan 28, 2012
Server error during processing: ["web request failed", {path, "/couchBase/default/_design/dev_test_view_on_10k_docs-2e7ee2f/_view/dev_test_view_on_10k_docs-2e7ee2f"},{type,error}

,

{what,badarg}

,
{trace,
[{erlang,list_to_binary,
[[

{ibrowse_http_client,to_ascii,"r"}

,

{ibrowse_http_client, hexlist_to_integer,3}

,

{ibrowse_http_client,parse_11_response, 2}

,

{ibrowse_http_client,handle_sock_data,2}

,

{gen_server,handle_msg,5}

,

{proc_lib,init_p_do_apply,3}]]}, {couch_httpd,error_info,1}, {couch_httpd,send_error,2}, {couch_httpd,handle_request_int,6}, {menelaus_web,loop,3}, {mochiweb_http,headers,5},{proc_lib,init_p_do_apply,3}

]}]