Got it. Thanks Flavio, Chris Nauroth. -----Original Message----- From: Chris Nauroth [mailto:[email protected]] Sent: 07 September 2016 22:24 To: [email protected]; [email protected] Subject: Re: ZooKeeper Sync API path parameter does not have any impact.
Yes, the sync operation really applies to the client’s entire view of ZooKeeper state, not a specific path or sub-tree, so I would not expect to see any significant difference in time for sync(/path1) vs. sync(/path2). The presence of the path is only a client API convenience. Expanding a bit on what Flavio already said, the reason a client calls sync is often because it wants to read up-to-date state for a specific path. If an application is doing this kind of logic for multiple paths, then it can check the path in AsyncCallback.VoidCallback#processResult and know that this is a completed sync in preparation for reading /path1 vs. /path2. I woudn’t expect any of this to influence execution time of the sync operation though. If you do see a difference in execution time, then that’s likely just a coincidence. (Maybe it’s just a coincidence that there was more write activity at the time of calling sync(/path1) vs. sync(/path2), and therefore one of those sync calls needed to do more work to catch up with all of the transactions.) --Chris Nauroth On 9/7/16, 8:47 AM, "Mohammad arshad" <[email protected]> wrote: So path is completely for ZooKeeper client. It has nothing to do with server. Therefore whether I execute sync /path1 or sync /path2, sync request will complete in the same time. right? -Arshad -----Original Message----- From: Flavio Junqueira [mailto:[email protected]] Sent: 07 September 2016 16:45 To: [email protected] Cc: [email protected] Subject: Re: ZooKeeper Sync API path parameter does not have any impact. The path parameter helps the app determine the path that the response is referring to. A sync call is typically associated to a read request to a given path, so the path in the sync call helps the application make the association to that path. -Flavio > On 07 Sep 2016, at 11:35, Mohammad arshad <[email protected]> wrote: > > Hello Everyone > ZooKeeper sync API takes a path argument. > But it seems this path is no where used in the server code. Same path is returned from the server to client again in SyncResponse. > Is the any other purpose of sync API path parameter. > Will there be any different impact for below sync commands form zk Cli? > sync /path1 > sync /path2 > > Thanks > -Arshad
