Dear Russell,
>What operation are you performing? What is the update you perform? Do you
set a register value, add a register, remove a register?
I used riakc_map:update to update value with map. I do the following steps :
- Get FetchData map with fetch_type
- Extract key, value, context from FetchData
- Obtain UpdateData with:
+ Init map with context
+ Use :
riakc_map:update({K, register}, fun(R) -> riakc_register:set(V, R) end,
InitMap)
to obtain UpdateData
Note:
K : key
V: value
- Then update UpdateData with update_type
The following is sample about Update data :
{map, [] ,
[{{<<"account_id">>,register},{register,<<>>,<<"
accounta25a424b8484181e8ba1bec25bf7c491">>}},{{<<"created_
by_id">>,register},{register,<<>>,<<"accounta25a424b8484181e8ba1bec
25bf7c491">>}},{{<<"created_time_dt">>,register},{register,<<>>,<<"2017-01-
27T03:34:04Z">>}},{{<<"currency">>,register},{register,<<>>,<<"cad">>}},{{<<
"end_time">>,register},{register,<<>>,<<"dont_use">>}}
,{{<<"id">>,register},{register,<<>>,<<"menufe89488afa948875cab6b0b18d
579f21">>}},{{<<"maintain_mode_b">>,register},{register,
<<>>,<<"false">>}},{{<<"menu_category_revision_id">>,
register},{register,<<>>,<<"0-634736bc14e0bd3ed7e3fe0f1ee644
43">>}},{{<<"name">>,register},{register,<<>>,<<"fullmenu">>
}},{{<<"order_i">>,register},{register,<<>>,<<"0">>}},{{<<"
rest_location_p">>,register},{register,<<>>,<<"10.844117421366443,106.
63982392275398">>}},{{<<"restaurant_id">>,register},{register,<<>>,<<"
rest848e042b3a0488640981c8a6dc4a8281">>}},{{<<"restaurant_
status_id">>,register},{register,<<>>,<<"inactive">>}}
,{{<<"start_time">>,register},{register,<<>>,<<"dont_use">>}
},{{<<"status_id">>,register},{register,<<>>,<<"show">>}},{{
<<"updated_by_id">>,register},{register,<<>>,<<"
accounta25a424b8484181e8ba1bec25bf7c491">>}},{{<<"updated_
time_dt">>,register},{register,<<>>,<<"2017-02-06T17:22:39Z">>}}],
[] , <<131,108,0,0,0,3,104,2,109,0,0,0,12,39,21,84,209,219,42,
57,233,0,0,156,252,97,34,104,2,109,0,0,0,12,132,107,248,
226,103,5,182,208,0,0,118,2,97,39,104,2,109,0,0,0,12,137,
252,139,186,176,202,25,96,0,0,195,164,97,53,106>>
}
On Tue, Feb 7, 2017 at 3:43 PM, Russell Brown <russell.br...@mac.com> wrote:
>
> On 7 Feb 2017, at 08:17, my hue <tranmyhue.grac...@gmail.com> wrote:
>
> > Dear John and Russell Brown,
> >
> > * How fast is your turnaround time between an update and a fetch?
> >
> > The turnaround time between an update and a fetch about 1 second.
> > During my team and I debug, we adjusted haproxy with the scenario as
> follow:
> >
> > Scenario 1 : round robin via 5 nodes of cluster
> >
> > We meet issue at scenario 1 and we are afraid of that timeout can be
> occurs between nodes,
> > make us still get stale data. Then we performed scenario 2
> >
> > Scenario 2: Disable round robin and only route request to node 1.
> Cluster still is 5 nodes.
> > With this case we ensure that request update and fetch always come to
> and from node 1.
> > And the issue still occurs.
> >
> > At the fail time, I hoped that can get any error log from riak nodes to
> give me any information.
> > But riak log show to me nothing and everything is ok.
> >
> > * What operation are you performing?
> >
> > I used :
> >
> > riakc_pb_socket:update_type(Pid, {Bucket-Type, Bucket}, Key,
> riakc_map:to_op(Map), []).
> > riakc_pb_socket:fetch_type(Pid, {BucketType, Bucket}, Key, []).
>
> What operation are you performing? What is the update you perform? Do you
> set a register value, add a register, remove a register?
> >
> > * It looks like the map is a single level map of last-write-wins
> registers. Is there a chance that the time on the node handling the update
> is behind the value in the lww-register?
> >
> > => I am not sure about logic show conflict of internal riak node. And
> the issue never happens if I used single node.
> > My bucket properties as follow :
> >
> > {"props":{"name":"menu","active":true,"allow_mult":
> true,"backend":"bitcask_mult","basic_quorum":false,"big_
> vclock":50,"chash_keyfun":{"mod":"riak_core_util","fun":"
> chash_std_keyfun"},"claimant":"riak-node1@64.137.190.244","
> datatype":"map","dvv_enabled":true,"dw":"quorum","last_
> write_wins":false,"linkfun":{"mod":"riak_kv_wm_link_walker",
> "fun":"mapreduce_linkfun"},"n_val":3,"name":"menu","
> notfound_ok":true,"old_vclock":86400,"postcommit":[],"pr":0,
> "precommit":[],"pw":0,"r":"quorum","rw":"quorum","search_
> index":"menu_idx","small_vclock":50,"w":"quorum","young_vclock":20}}
> >
> > Note :
> > + "datatype":"map"
> > + "last_write_wins": false
> > + "dvv_enabled": true
> > + "allow_mult": true
> >
> >
> > * Have you tried using the `modify_type` operation in riakc_pb_socket
> which does the fetch/update operation in sequence for you?
> >
> > => I dot not use yet, but my action is sequence with fetch and then
> update. Might be I will try modify_type to see.
> >
> > * Anything in the error logs on any of the nodes?
> >
> > => From the node log, no errror report at fail time.
> >
> > * Is the opaque context identical from the fetch and then later after
> the update?
> >
> > => There is the context got from fetch and that context used with
> update.
> > And during our debug time with string of sequence : fetch , update,
> fetch , update , .... the context I saw always the same at
> > fetch data.
> >
> > Best regards,
> > Hue Tran
> >
> >
> >
> > On Tue, Feb 7, 2017 at 2:11 AM, John Daily <jda...@basho.com> wrote:
> > Originally I suspected the context which allows Riak to resolve
> conflicts was not present in your data, but I see it in your map structure.
> Thanks for supplying such a detailed description.
> >
> > How fast is your turnaround time between an update and a fetch? Even if
> the cluster is healthy it’s not impossible to see a timeout between nodes,
> which could result in a stale retrieval. Have you verified whether the
> stale data persists?
> >
> > A single node cluster gives an advantage that you’ll never see in a real
> cluster: a perfectly synchronized clock. It also reduces (but does not
> completely eliminate) the possibility of an internal timeout between
> processes.
> >
> > -John
> >
> >> On Feb 6, 2017, at 1:02 PM, my hue <tranmyhue.grac...@gmail.com> wrote:
> >>
> >> Dear Riak Team,
> >>
> >> I and my team used riak as database for my production with an cluster
> including 5 nodes.
> >> While production run, we meet an critical bug that is sometimes fail to
> update document.
> >> I and my colleagues performed debug and detected an issue with the
> scenario as follow:
> >>
> >> + fetch document
> >> + change value of document
> >> + update document
> >>
> >> Repeat about 10 times and will meet fail. With the document is updated
> continually,
> >> sometimes will face update fail.
> >>
> >> The first time, 5 nodes of cluster we used riak version 2.1.1.
> >> After meet above bug, we upgraded to use riak version 2.2.0 and this
> issue still occurs.
> >>
> >> Via many time test, debug using Tcpdump at riak node :
> >>
> >> tcpdump -A -ttt -i {interface} src host {host} and dst port {port}
> >>
> >> And together with the command:
> >>
> >> riak-admin status | grep "node_puts_map\| node_puts_map_total\|
> node_puts_total\| vnode_map_update_total\| vnode_puts_total\"
> >>
> >> we got that the riak server already get the update request.
> >> However, do not know why riak backend fail to update document.
> >> At the fail time, from riak server log everything is ok.
> >>
> >> Then we removed cluster and use a single riak server, and see that
> above bug never happen.
> >>
> >> For that reason, think that is only happen with cluster work. We took
> research on basho riak document and our riak configure
> >> seems that like suggestion from document. We totally blocked on this
> issue and hope that can get support from you
> >> so that can obtain a stable work from riak database for our production.
> >> Thank you so much. Hope that can get your reply soon.
> >>
> >>
> >> * The following is our riak node information :
> >>
> >> Riak version: 2.2.0
> >> OS : CentOS Linux release 7.2.1511
> >> Cpu : 4 core
> >> Memory : 4G
> >> Riak configure : the attached file "riak.conf"
> >>
> >> Note :
> >>
> >> - We mostly using default configure of riak configure except that we
> used storage backend is multi
> >>
> >> storage_backend = multi
> >> multi_backend.bitcask_mult.storage_backend = bitcask
> >> multi_backend.bitcask_mult.bitcask.data_root =
> /var/lib/riak/bitcask_mult
> >> multi_backend.default = bitcask_mult
> >>
> >> ------------------------------------------------------------
> -----------------------------------------------------------------
> >>
> >> - Bucket type created with the following command:
> >>
> >> riak-admin bucket-type create dev_restor '{"props":{"backend":"bitcask_
> mult","datatype":"map"}}'
> >> riak-admin bucket-type activate dev_restor
> >>
> >> ------------------------------------------------------------
> -----------------------------------------------------------------
> >>
> >> - Bucket Type Status :
> >>
> >> >> riak-admin bucket-type status dev_restor
> >>
> >> dev_restor is active
> >> young_vclock: 20
> >> w: quorum
> >> small_vclock: 50
> >> rw: quorum
> >> r: quorum
> >> pw: 0
> >> precommit: []
> >> pr: 0
> >> postcommit: []
> >> old_vclock: 86400
> >> notfound_ok: true
> >> n_val: 3
> >> linkfun: {modfun,riak_kv_wm_link_walker,mapreduce_linkfun}
> >> last_write_wins: false
> >> dw: quorum
> >> dvv_enabled: true
> >> chash_keyfun: {riak_core_util,chash_std_keyfun}
> >> big_vclock: 50
> >> basic_quorum: false
> >> backend: <<"bitcask_mult">>
> >> allow_mult: true
> >> datatype: map
> >> active: true
> >> claimant: 'riak-node1@64.137.190.244'
> >>
> >> ------------------------------------------------------------
> -----------------------------------------------------------------
> >>
> >> - Bucket Property :
> >>
> >> {"props":{"name":"menu","active":true,"allow_mult":
> true,"backend":"bitcask_mult","basic_quorum":false,"big_
> vclock":50,"chash_keyfun":{"mod":"riak_core_util","fun":"
> chash_std_keyfun"},"claimant":"riak-node1@64.137.190.244","
> datatype":"map","dvv_enabled":true,"dw":"quorum","last_
> write_wins":false,"linkfun":{"mod":"riak_kv_wm_link_walker",
> "fun":"mapreduce_linkfun"},"n_val":3,"name":"menu","
> notfound_ok":true,"old_vclock":86400,"postcommit":[],"pr":0,
> "precommit":[],"pw":0,"r":"quorum","rw":"quorum","search_
> index":"menu_idx","small_vclock":50,"w":"quorum","young_vclock":20}}
> >>
> >>
> >> ------------------------------------------------------------
> -----------------------------------------------------------------
> >>
> >> - Member status :
> >>
> >> >> riak-admin member-status
> >>
> >> ================================= Membership
> ==================================
> >> Status Ring Pending Node
> >> ------------------------------------------------------------
> -------------------
> >> valid 18.8% -- 'riak-node1@64.137.190.244'
> >> valid 18.8% -- 'riak-node2@64.137.247.82'
> >> valid 18.8% -- 'riak-node3@64.137.162.64'
> >> valid 25.0% -- 'riak-node4@64.137.161.229'
> >> valid 18.8% -- 'riak-node5@64.137.217.73'
> >> ------------------------------------------------------------
> -------------------
> >> Valid:5 / Leaving:0 / Exiting:0 / Joining:0 / Down:0
> >>
> >>
> >> ------------------------------------------------------------
> -----------------------------------------------------------------
> >>
> >> - Ring
> >>
> >> >> riak-admin status | grep ring
> >>
> >> ring_creation_size : 64
> >> ring_members : ['riak-node1@64.137.190.244','riak-node2@64.137.247.82',
> 'riak-node3@64.137.162.64','riak-node4@64.137.161.229', '
> riak-node5@64.137.217.73']
> >> ring_num_partitions : 64
> >> ring_ownership : <<"[{'riak-node2@64.137.247.82',12},\n {'
> riak-node5@64.137.217.73',12},\n {'riak-node1@64.137.190.244',12},\n {'
> riak-node3@64.137.162.64',12},\n {'riak-node4@64.137.161.229',16}]">>
> >> rings_reconciled : 0
> >> rings_reconciled_total : 31
> >>
> >> ------------------------------------------------------------
> -----------------------------------------------------------------
> >>
> >> * The riak client :
> >>
> >> + riak-erlang-client: https://github.com/basho/riak-erlang-client
> >> + release : 2.4.2
> >>
> >> ------------------------------------------------------------
> -----------------------------------------------------------------
> >>
> >> * Riak client API used:
> >>
> >> + Insert/Update:
> >>
> >> riakc_pb_socket:update_type(Pid, {Bucket-Type, Bucket}, Key,
> riakc_map:to_op(Map), []).
> >>
> >> + Fetch :
> >>
> >> riakc_pb_socket:fetch_type(Pid, {BucketType, Bucket}, Key, []).
> >>
> >> ------------------------------------------------------------
> -----------------------------------------------------------------
> >>
> >> * Step to perform an update :
> >>
> >> - Fetch document
> >> - Update document
> >>
> >> ------------------------------------------------------------
> -----------------------------------------------------------------
> >>
> >> * Data got from fetch_type:
> >>
> >> {map, [{{<<"account_id">>,register}, <<"accounta25a424b8484181e8ba1bec
> 25bf7c491">>},
> >> {{<<"created_by_id">>,register},
> >> <<"accounta25a424b8484181e8ba1bec25bf7c491">>},
> {{<<"created_time_dt">>,register},<<"2017-01-27T03:34:04Z">>},
> {{<<"currency">>,register},<<"cad">>},
> {{<<"end_time">>,register},<<"dont_use">>},
> {{<<"id">>,register},<<"menufe89488afa948875cab6b0b18d579f21">>},
> {{<<"maintain_mode_b">>,register},<<"false">>},
> {{<<"menu_category_revision_id">>,register}, <<"0-
> 634736bc14e0bd3ed7e3fe0f1ee64443">>}, {{<<"name">>,register},<<"fullmenu">>},
> {{<<"order_i">>,register},<<"0">>}, {{<<"rest_location_p">>,register},
> <<"10.844117421366443,106.63982392275398">>}, {{<<"restaurant_id">>,register},
> <<"rest848e042b3a0488640981c8a6dc4a8281">>},
> {{<<"restaurant_status_id">>,register},<<"inactive">>},
> {{<<"start_time">>,register},<<"dont_use">>},
> {{<<"status_id">>,register},<<"hide">>}, {{<<"updated_by_id">>,register},
> <<"accounta25a424b8484181e8ba1bec25bf7c491">>}, {{<<"updated_time_dt">>,
> register},<<"2017-02-06T17:22:39Z">>}],
> >> [],
> >> [], <<131,108,0,0,0,3,104,2,109,0,0,0,12,39,21,84,209,219,42,57,
> 233,0,0,156,252,97,34,104,2,109,0,0,0,12,132,107,248,226,
> 103,5,182,208,0,0,118,2,97,40,104,2,109,0,0,0,12,137,252,
> 139,186,176,202,25,96,0,0,195,164,97,54,106>>}
> >>
> >>
> >> * Update with update_type
> >>
> >> Below is Map data before using riakc_map:to_op(Map) :
> >>
> >> {map, [] ,
> >> [{{<<"account_id">>,register},{register,<<>>,<<"
> accounta25a424b8484181e8ba1bec25bf7c491">>}},{{<<"created_
> by_id">>,register},{register,<<>>,<<"accounta25a424b8484181e8ba1bec
> 25bf7c491">>}},{{<<"created_time_dt">>,register},{
> register,<<>>,<<"2017-01-27T03:34:04Z">>}},{{<<"currency">>,register},{
> register,<<>>,<<"cad">>}},{{<<"end_time">>,register},{
> register,<<>>,<<"dont_use">>}},{{<<"id">>,register},{register,<<>>,<<"
> menufe89488afa948875cab6b0b18d579f21">>}},{{<<"maintain_
> mode_b">>,register},{register,<<>>,<<"false">>}},{{<<"menu_
> category_revision_id">>,register},{register,<<>>,<<"0-
> 634736bc14e0bd3ed7e3fe0f1ee64443">>}},{{<<"name">>,register}
> ,{register,<<>>,<<"fullmenu">>}},{{<<"order_i">>,register},{
> register,<<>>,<<"0">>}},{{<<"rest_location_p">>,register},{
> register,<<>>,<<"10.844117421366443,106.63982392275398">>}},{{<<"
> restaurant_id">>,register},{register,<<>>,<<"
> rest848e042b3a0488640981c8a6dc4a8281">>}},{{<<"restaurant_
> status_id">>,register},{register,<<>>,<<"inactive">>}}
> ,{{<<"start_time">>,register},{register,<<>>,<<"dont_use">>}
> },{{<<"status_id">>,register},{register,<<>>,<<"show">>}},{{
> <<"updated_by_id">>,register},{register,<<>>,<<"
> accounta25a424b8484181e8ba1bec25bf7c491">>}},{{<<"updated_
> time_dt">>,register},{register,<<>>,<<"2017-02-06T17:22:39Z">>}}],
> >> [] , <<131,108,0,0,0,3,104,2,109,0,0,0,12,39,21,84,209,219,42,57,
> 233,0,0,156,252,97,34,104,2,109,0,0,0,12,132,107,248,226,
> 103,5,182,208,0,0,118,2,97,39,104,2,109,0,0,0,12,137,252,
> 139,186,176,202,25,96,0,0,195,164,97,53,106>>
> >> }
> >>
> >>
> >>
> >>
> >> -
> >>
> >> Best regards,
> >> Hue Tran
> >> <riak.conf>_______________________________________________
> >> riak-users mailing list
> >> riak-users@lists.basho.com
> >> http://lists.basho.com/mailman/listinfo/riak-users_lists.basho.com
> >
> >
>
>
_______________________________________________
riak-users mailing list
riak-users@lists.basho.com
http://lists.basho.com/mailman/listinfo/riak-users_lists.basho.com
