We want to explore Riak multi backend support for the following scenario,
configuration data stored in Level DB, while some transit data will be stored
in memory and expires after a certain time. Unfortunately I have the toughest
time getting multi-backend support to work, every time I tried to access my
non-default backend.
Here is the configuration around multi-backend,
{riak_kv, [
%% Storage_backend specifies the Erlang module defining the storage
%% mechanism that will be used on this node.
%%{storage_backend, riak_kv_bitcask_backend},
%%{storage_backend, riak_kv_eleveldb_backend},
%%{storage_backend, riak_kv_memory_backend},
{storage_backend, riak_kv_multi_backend},
{multi_backend_default, "memory_mult"},
{multi_backend, [
%% Here's where you set the individual multiplexed backends
{"eleveldb_mult", riak_kv_eleveldb_backend,[]
},
{"memory_mult", riak_kv_memory_backend,
[
{ttl, 10},
{max_memory, 512}
]
}
]},
When I tried to access "eleveldb_mult, I am seeing the following exception in
the log file,
2012-09-26 10:27:54.041 [error] <0.892.0> gen_fsm <0.892.0> in state active
terminated with reason: bad return value:
{riak_kv_multi_backend,undefined_backend,<<"eleveldb_mult">>}
2012-09-26 10:27:54.044 [error] <0.892.0> CRASH REPORT Process <0.892.0> with 0
neighbours crashed with reason: bad return value:
{riak_kv_multi_backend,undefined_backend,<<"eleveldb_mult">>}
2012-09-26 10:27:54.045 [error] <0.877.0> gen_fsm <0.877.0> in state active
terminated with reason: bad return value:
{riak_kv_multi_backend,undefined_backend,<<"eleveldb_mult">>}
2012-09-26 10:27:54.046 [error] <0.94.0> Supervisor riak_core_vnode_sup had
child undefined started with {riak_core_vnode,start_link,undefined} at
<0.892.0> exit with reason bad return value:
{riak_kv_multi_backend,undefined_backend,<<"eleveldb_mult">>} in context
child_terminated
2012-09-26 10:27:54.048 [error] <0.907.0> gen_fsm <0.907.0> in state active
terminated with reason: bad return value:
{riak_kv_multi_backend,undefined_backend,<<"eleveldb_mult">>}
2012-09-26 10:27:54.049 [error] <0.877.0> CRASH REPORT Process <0.877.0> with 0
neighbours crashed with reason: bad return value:
{riak_kv_multi_backend,undefined_backend,<<"eleveldb_mult">>}
2012-09-26 10:27:54.050 [error] <0.907.0> CRASH REPORT Process <0.907.0> with 0
neighbours crashed with reason: bad return value:
{riak_kv_multi_backend,undefined_backend,<<"eleveldb_mult">>}
2012-09-26 10:27:54.051 [error] <0.94.0> Supervisor riak_core_vnode_sup had
child undefined started with {riak_core_vnode,start_link,undefined} at
<0.877.0> exit with reason bad return value:
{riak_kv_multi_backend,undefined_backend,<<"eleveldb_mult">>} in context
child_terminated
2012-09-26 10:27:54.052 [error] <0.94.0> Supervisor riak_core_vnode_sup had
child undefined started with {riak_core_vnode,start_link,undefined} at
<0.907.0> exit with reason bad return value:
{riak_kv_multi_backend,undefined_backend,<<"eleveldb_mult">>} in context
child_terminated
Any insights will be greatly appreciated.
Thanks.
-- Lei
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