+1, I think we had discussed this before to provide some kind of namespace in bookkeeper so that applications do not have to worry abt remembering numbers.
Thanks mahadev On 12/17/10 10:28 AM, "Dhruba Borthakur" <[email protected]> wrote: Thanks Flavio, i will open JIRAs for these ones thanks. thanks a bunch, dhruba On Fri, Dec 17, 2010 at 3:39 AM, Flavio Junqueira <[email protected]> wrote: > Hi Dhruba, Ledgers are not named by the application currently. We simply > assign an increasing identification number to a new ledger. Consequently, it > is not possible to ask BK if ledger "foo" exists. > > I don't think it would be difficult to add this feature, though. We keep > the ledger metadata on ZooKeeper, and we can simply name the corresponding > znodes using the alias the application provides. In fact, one option would > be to implement this alias scheme directly on the application using the same > ZooKeeper installation. > > Regarding the size of a ledger, we keep the entry count, but not the byte > count currently. This is also an interesting feature we could consider > adding. > > Cheers, > -Flavio > > On Dec 17, 2010, at 7:44 AM, Dhruba Borthakur wrote: > > Hi folks, > > I have a few questions about BookKeeper APIs: > > 1. is there a way to atomically check and create a ledger, something > similar > to to the POSIX O_CREAT flag? I would like to create a ledger only if the > ledger does not already exist. If it exists, then the createLedger call > should fail. Is there a way to achieve this functionality? > 2. Is there a way to find the current size of a ledger? > > thanks, > dhruba > -- > Connect to me at http://www.facebook.com/dhruba > > > *flavio* > *junqueira* > > 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 > > > -- Connect to me at http://www.facebook.com/dhruba
