Why is the Erlang riak client crashing? - riak

Question

I have followed the riak installation instructions for Ubuntu and the readme for the riak erlang client. At the point in the client instructions where a ping is sent to test the connection, I get the error report below indicating a missing module. In the report, I've replace my server IP with IP_Of_Server.
How do I make sure the module is included in the compile of the client? Where should it be located?
riakc_pb_socket:ping(Pid).
=ERROR REPORT==== 28-Apr-2022::20:04:49.468604 ===
** Generic server <0.81.0> terminating
** Last message in was {req,rpbpingreq,60000}
** When Server state == {state,"IP_Of_Server",8087,false,false,#Port<0.7>,
false,gen_tcp,undefined,
{[],[]},
1,[],infinity,undefined,undefined,undefined,
undefined,[],100,false,
{false,0}}
** Reason for termination ==
** {'module could not be loaded',
[{riak_pb_codec,encode,[rpbpingreq],[]},
{riakc_pb_socket,encode_request_message,1,
[{file,"/home/pseudo/riak-erlang-client/src/riakc_pb_socket.erl"},
{line,3297}]},
{riakc_pb_socket,send_request,2,
[{file,"/home/pseudo/riak-erlang-client/src/riakc_pb_socket.erl"},
{line,3269}]},
{riakc_pb_socket,handle_call,3,
[{file,"/home/pseudo/riak-erlang-client/src/riakc_pb_socket.erl"},
{line,2089}]},
{gen_server,try_handle_call,4,[{file,"gen_server.erl"},{line,661}]},
{gen_server,handle_msg,6,[{file,"gen_server.erl"},{line,690}]},
{proc_lib,init_p_do_apply,3,[{file,"proc_lib.erl"},{line,249}]}]}
** Client <0.78.0> stacktrace
** [{gen,do_call,4,[{file,"gen.erl"},{line,167}]},
{gen_server,call,3,[{file,"gen_server.erl"},{line,219}]},
{erl_eval,do_apply,6,[{file,"erl_eval.erl"},{line,684}]},
{shell,exprs,7,[{file,"shell.erl"},{line,686}]},
{shell,eval_exprs,7,[{file,"shell.erl"},{line,642}]},
{shell,eval_loop,3,[{file,"shell.erl"},{line,627}]}]
=CRASH REPORT==== 28-Apr-2022::20:04:49.469247 ===
crasher:
initial call: riakc_pb_socket:init/1
pid: <0.81.0>
registered_name: []
exception error: undefined function riak_pb_codec:encode/1
in function riakc_pb_socket:encode_request_message/1 (/home/pseudo/riak-erlang-client/src/riakc_pb_socket.erl, line 3297)
in call from riakc_pb_socket:send_request/2 (/home/pseudo/riak-erlang-client/src/riakc_pb_socket.erl, line 3269)
in call from riakc_pb_socket:handle_call/3 (/home/pseudo/riak-erlang-client/src/riakc_pb_socket.erl, line 2089)
in call from gen_server:try_handle_call/4 (gen_server.erl, line 661)
in call from gen_server:handle_msg/6 (gen_server.erl, line 690)
ancestors: [<0.78.0>]
message_queue_len: 0
messages: []
links: [<0.78.0>,#Port<0.7>]
dictionary: []
trap_exit: false
status: running
heap_size: 6772
stack_size: 27
reductions: 13740
neighbours:
neighbour:
pid: <0.78.0>
registered_name: []
initial_call: {erlang,apply,2}
current_function: {gen,do_call,4}
ancestors: []
message_queue_len: 0
links: [<0.77.0>,<0.81.0>]
trap_exit: false
status: waiting
heap_size: 610
stack_size: 34
reductions: 4167
current_stacktrace: [{gen,do_call,4,[{file,"gen.erl"},{line,167}]},
{gen_server,call,3,[{file,"gen_server.erl"},{line,219}]},
{erl_eval,do_apply,6,[{file,"erl_eval.erl"},{line,684}]},
{shell,exprs,7,[{file,"shell.erl"},{line,686}]},
{shell,eval_exprs,7,[{file,"shell.erl"},{line,642}]},
{shell,eval_loop,3,[{file,"shell.erl"},{line,627}]}]
** exception exit: undef
in function riak_pb_codec:encode/1
called as riak_pb_codec:encode(rpbpingreq)
in call from riakc_pb_socket:encode_request_message/1 (/home/pseudo/riak-erlang-client/src/riakc_pb_socket.erl, line 3297)
in call from riakc_pb_socket:send_request/2 (/home/pseudo/riak-erlang-client/src/riakc_pb_socket.erl, line 3269)
in call from riakc_pb_socket:handle_call/3 (/home/pseudo/riak-erlang-client/src/riakc_pb_socket.erl, line 2089)
in call from gen_server:try_handle_call/4 (gen_server.erl, line 661)
in call from gen_server:handle_msg/6 (gen_server.erl, line 690)
in call from proc_lib:init_p_do_apply/3 (proc_lib.erl, line 249)

Answer 1

Here is what I have found.
When starting the REPL, the line
erl -pa ./riak-erlang-client/_build/default/lib/riakc/ebin ./riak-erlang-client/_build/default/lib/riakc/deps/*/ebin
was missing a directory declaration. I changed it to be
erl -pa ./riak-erlang-client/_build/default/lib/riakc/ebin ./riak-erlang-client/_build/default/lib/riakc/deps/*/ebin ./riak-erlang-client/_build/default/lib/riak_pb/ebin/