One more thing - I set up the hooks by bucket, not bucket type. The
documentation for 2.1.4 says that hooks are defined on the bucket level.
Here is how I set up precommit hook (derived from "Riak Handbook" p95):
curl -X PUT localhost:8098/types/test_kv_wo/buckets/uuid_log/props -H
'Content-Type: application/json' -d '{ "props": { "precommit": [{"mod":
"precommit", "fun": "pre_uuid"}]}}' -v
On Tue, May 10, 2016 at 9:15 PM, Sanket Agrawal <sanket.agra...@gmail.com>
wrote:
> I just set up a precommit hook function in dev environment (KV 2.1.4)
> which doesn't seem to be triggering off at all. The object is being stored
> in the bucket, but the precommit logic is not kicking off. I checked couple
> of things as listed below but came up with no error - so, it is a
> head-scratcher why precommit hook is not triggering:
>
>> - Verify precommit is set in bucket properties - snippet from curl query
>> for bucket props below:
>> "precommit":[{"mod":"precommit","fun":"pre_uuid"}]
>>
>> - check there is no error in logs
>>
>> - check riak-console for commit errors:
>> $ ./riak1/bin/riak-admin status|grep commit
>> postcommit_fail : 0
>> precommit_fail : 0
>>
>> - Run the precommit function manually on Riak console itself with a riak
>> object (that the hook failed to trigger on), and verify it works
>
>
>
> Also, there is no sasl-error.log. "sasl = on" doesn't work in 2.1.4
> because it fails with bad_config error. So, I am assuming sasl logging is
> enabled by default.
>
> Here is what precommit function does:
> - For the object (an immutable log append of JSON), calculate the location
> of a LWW bucket, and update a easily calculated key with that JSON body. It
> works fine from Riak console itself. Code below - we call pre_uuid in
> precommit hook - both precommit.beam (where the function is) and
> rutils.beam have been copied to the relevant location as set in riak
> config, are accessible through Riak console and work fine if manually
> executed on an object:
>
> %% Preprocess JSON, and copy to a LWW bucket type
>> preprocessJ(RObj,B,Choplen) ->
>> Bn = {rutils:calcBLWWType(RObj),B}, %%this returns the location of LWW
>> bucket - works fine in riak console
>> %% We store uuid map in <username> key - we take out timestamp of
>> length 32 including "_"
>> K = riak_object:key(RObj),
>> Kn = binary:part(K,0,byte_size(K) - Choplen),
>> NObj =
>> riak_object:new(Bn,Kn,riak_object:get_value(RObj),riak_object:get_metadata(RObj)),
>> {ok, C} = riak:local_client(),
>> case C:put(NObj) of
>> ok -> RObj;
>> _ -> {fail,<<"Error when trying to process in precommit hook">>}
>> end.
>>
>> pre_uuid(RObj) -> preprocessJ(RObj,<<"uuid_latest">>,32).
>
>
> Below is a manual execution from riak console of precommit function -
> first we execute it to confirm it is returning the original object:
>
>> (riak1@127.0.0.1)5> precommit:pre_uuid(O1).
>> {r_object,{<<"test_kv_wo">>,<<"uuid_log">>},
>> <<"ahmed_2016-05-10T20%3a47%3a47.346299Z">>,
>> [{r_content,{dict,3,16,16,8,80,48,
>>
>> {[],[],[],[],[],[],[],[],[],[],[],[],[],[],...},
>>
>> {{[],[],[],[],[],[],[],[],[],[],[[...]|...],[],...}}},
>>
>> <<"{\"uname\":\"ahmed\",\"uuid\":\"df8c10e0-381d-5f65-bf43-cb8b4cb806fc\",\"timestamp\":\"2016-05-"...>>}],
>> [{<<0>>,{1,63630132467}}],
>> {dict,1,16,16,8,80,48,
>> {[],[],[],[],[],[],[],[],[],[],[],[],[],[],[],...},
>> {{[],[],[],[],[],[],[],[],[],[],[],[],[],...}}},
>> undefined}
>
>
> Now, we check if the object has been written to test_lww/uuid_latest
> bucket type:
>
>> (riak1@127.0.0.1)6>
>> C:get({<<"test_lww">>,<<"uuid_latest">>},<<"ahmed">>).
>
> {ok,{r_object,{<<"hnm_fsm_lww">>,<<"uuid_latest">>},
>> <<"ahmed">>,
>> [{r_content,{dict,4,16,16,8,80,48,
>> {[],[],[],[],[],[],[],[],[],[],[],[],...},
>> {{[],[],[],[],[],[],[],[],[],[],...}}},
>>
>> <<"{\"uname\":\"ahmed\",\"uuid\":\"df8c10e0-381d-5f65-bf43-cb8b4cb806fc\",\"timestamp\":\""...>>}],
>> [{<<153,190,230,200,210,126,212,127,0,0,156,65>>,
>> {1,63630148036}}],
>> {dict,1,16,16,8,80,48,
>> {[],[],[],[],[],[],[],[],[],[],[],[],[],...},
>> {{[],[],[],[],[],[],[],[],[],[],[],...}}},
>> undefined}}
>
>
> Will appreciate pointer on how to debug precommit hook.
>
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