badmatch on big binary ---------------------- Key: COUCHDB-1393 URL: https://issues.apache.org/jira/browse/COUCHDB-1393 Project: CouchDB Issue Type: Bug Reporter: Jan Lehnardt
via dev@ by Peta Bogdan <bog...@gmail.com> Hello, I have a small database around 120 MB with approximately 16,000 documents. However, it happens (also from futon) that I get this error: [Tue, 17 Jan 2012 07:22:01 GMT] [error] [<0.185.0>] {error_report,<0.30.0>, {<0.185.0>,crash_report, [[{initial_call,{couch_file,init,['Argument__1']}}, {pid,<0.185.0>}, {registered_name,[]}, {error_info, {exit, {{badmatch, {ok, 9_MEGABYTES_BINARY}}, [{couch_file,read_raw_iolist_int,3}, {couch_file,maybe_read_more_iolist,4}, {couch_file,handle_call,3}, {gen_server,handle_msg,5}, {proc_lib,init_p_do_apply,3}]}, [{gen_server,terminate,6}, {proc_lib,init_p_do_apply,3}]}}, {ancestors,[<0.184.0>]}, {messages, [{'$gen_call', {<0.10840.18>,#Ref<0.0.3.20907>}, bytes}]}, {links,[<0.190.0>]}, {dictionary,[]}, {trap_exit,true}, {status,running}, {heap_size,1597}, {stack_size,24}, {reductions,65666}], [{neighbour, [{pid,<0.190.0>}, {registered_name,[]}, {initial_call, {couch_ref_counter,init,['Argument__1']}}, {current_function,{gen_server,loop,6}}, {ancestors,[<0.188.0>,<0.187.0>,<0.184.0>]}, {messages,[]}, {links,[<0.185.0>]}, {dictionary,[]}, {trap_exit,false}, {status,waiting}, {heap_size,610}, {stack_size,9}, {reductions,362}]}]]}} If this error occurs to frequently causes couch_server to reach its max restart frequency causing the entire supervision tree to shutdown and hence the database server instance disappears. The function couch_file:read_raw_iolist_int/3 calls file:pread which returns {ok, Binary}. This Binary has almost 9 megabytes in size, which is very strange. I think this does mean that the function file:pread/3 is instructed to read from wrong position. The only reason I can think of is that the value of 'TotalBytes' from line (1) doesn't match the value of 'TotalBytes' from line (2) (1) TotalBytes = calculate_total_read_len(BlockOffset, Len), (2) {ok, <<RawBin:TotalBytes/binary>>} = file:pread(Fd, Pos, TotalBytes), The possible answer would be that in certain conditions the function calculate_total_read_len/2 doesn't return the expected value. Server: CouchDB/1.1.1 (Erlang OTP/R14B04) OS: OpenBSD 5.0 GENERIC.MP#63 amd64 Now, the trouble is how to circumvent this situation. Thank you in advance, Bogdan -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa For more information on JIRA, see: http://www.atlassian.com/software/jira