-Re: More sync questions
Flavio Junqueira 2011-11-24, 13:54
Hi Jordan, exists is a read operation, check processRequest in
On Nov 23, 2011, at 7:53 PM, Jordan Zimmerman wrote:
> Flavio, what I saw in the code (bear in mind I've only casually
> looked at
> the code) is that getData, getChildren, etc. use the local server's
> exists() appears to follow the same path as create(), etc. in that
> it goes
> through the leader.
> On 11/23/11 10:23 AM, "Flavio Junqueira" <[EMAIL PROTECTED]> wrote:
>> In the way I understood the question, Jordan seems to have observed
>> that sync() is not affecting exists (correct me if I'm wrong,
>> If that's the case, then I believe we have a bug.
>> On Nov 23, 2011, at 6:01 PM, Patrick Hunt wrote:
>>> On Thu, Nov 10, 2011 at 10:29 PM, Jordan Zimmerman
>>> <[EMAIL PROTECTED]> wrote:
>>>> A while back I asked about sync() and got responses that said it's
>>>> only needed for reads (getData, getChildren). I was looking through
>>>> the source and it appears that this does _not_ apply to exsists().
>>>> Am I reading that correctly? i.e. will exists() always return an
>>>> accurate (in terms of the leader) view of a node's metadata?
>>> No, sync applies to any read. We call it "slow read" in some cases
>>> because it forces the follower to get up to date with the leader.
>>> Keep in mind that any read from any server is never "accurate" at
>>> least in the sense that you likely mean it. e.g. the state of
>>> leadership may change btw the time the server responds to your
>>> call and the time it takes for TCP/OS to propagate the response to
>>> your client.
>> research scientist
>> [EMAIL PROTECTED]
>> direct +34 93-183-8828
>> avinguda diagonal 177, 8th floor, barcelona, 08018, es
>> phone (408) 349 3300 fax (408) 349 3301
direct +34 93-183-8828
avinguda diagonal 177, 8th floor, barcelona, 08018, es
phone (408) 349 3300 fax (408) 349 3301