[riak] put request

wde wde at free.fr
Tue Feb 16 12:03:11 EST 2010


Hi rusty,

Thank you for the clarification.



 
>Hi W,
>
>You are right that all operations go through vnode_master, but this process
>is simply a dispatcher, working in a fire-and-forget type way, so it is not
>a bottleneck. Only a small fraction of the overall operation time is spent
>in the master process, and the master is free to handle the next operation
>as soon as it dispatches the current one.
>
>You can see what I mean around line 43 of vnode_master.erl. The vnode_master
>simply maps partition to a Pid (process id) of a vnode process by doing a
>lookup in an in-memory table, and then dispatching the request to that Pid:
>
>    Pid = get_vnode(Partition, State),
>    gen_fsm:send_event(Pid, {put, FSM_pid, BKey, RObj, ReqID, FSMTime}),
>
>Best,
>Rusty
>
>On Sat, Feb 13, 2010 at 9:59 AM, wde <wde at free.fr> wrote:
>
>> Hello,
>>
>>
>> If I have understood correctly, all put requests sent to a riak node, are
>> handled by the "vnode_master",
>> before to be routed to the vnode that handles the corresponding partition.
>>
>> Do you think that the "vnode_master" could be a bottleneck ? All requests
>> to a riak node are serialized by the "vnode_master" FSM.
>>
>>
>> thank you
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
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>>
>






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