Yup. I think it is in general a good idea to have such admin portal that could query or control the internal state.
+1 for it. - Sijie On Mon, Feb 29, 2016 at 10:34 AM, Arun M. Krishnakumar <[email protected]> wrote: > Hi Sijie, > > Yes, that's correct. The work-item is about building an admin command to > force the flush and I was looking for any option or workaround to do the > job. > > As we understand it, there doesn't seem to be a nice way to communicate > with the bookies for such OOB (out of band) requests. So one of the options > is to have a separate communication channel from the shell to the bookie. > This would enable other interesting commands such as querying the exact > states of various caches, getting some statistical numbers etc. > > Do you have any other requirements that would fall into this general > operational category ? If so, and if the approach isn't too bad, we could > work on a clean channel and protocol that could be used for such > communications. > > Thanks, > Arun > > On Mon, Feb 29, 2016 at 9:45 AM, Sijie Guo <[email protected]> wrote: > > > We don't have the mechanism to trigger/force a flush by the command right > > now. > > > > Arun: > > > > As my understanding on your question, you want to admin command that you > > could issue to trigger the flush, right? > > > > - Sijie > > > > On Fri, Feb 26, 2016 at 10:33 PM, Venkateswara Rao Jujjuri < > > [email protected]> wrote: > > > > > Also do we have a way to flush to ledger on disk? Some of the bookie > > shell > > > commands will fail if there is no disk entry for journals. > > > > > > Thanks, > > > JV > > > > > > On Sat, Feb 27, 2016 at 5:29 AM, Arun M. Krishnakumar < > > [email protected]> > > > wrote: > > > > > > > (Please ignore the first part of the question since that can be done > > by a > > > > shell command. I am interested in the second part.) > > > > > > > > Thanks, > > > > Arun > > > > > > > > On Fri, Feb 26, 2016 at 1:05 PM, Arun M. Krishnakumar < > > > [email protected]> > > > > wrote: > > > > > > > > > Hi Matteo, > > > > > > > > > > Thanks for the quick reply. > > > > > > > > > > The use case is mainly for testing and debugging during > development. > > > > > > > > > > Is there a way to check the entry in the journal device (say a > > running > > > > > count of pending entries yet to be written out to the entry log) ? > > > > > Ideally I was thinking of querying the entry log itself. > > > > > > > > > > Thanks, > > > > > Arun > > > > > > > > > > > On Feb 26, 2016, at 12:34 PM, Matteo Merli <[email protected]> > > > wrote: > > > > > > > > > > > > Hi Arun, > > > > > > > > > > > > what is your use case for waiting until the entries are "flushed" > > > into > > > > > the > > > > > > entry logs? > > > > > > > > > > > > Once the ledger.addEntry() operation completes, the entries are > > > > > guaranteed > > > > > > to have been written and fsynced on the journal device, from > where > > > they > > > > > > will be recovered in case the bookie crashes before flushing to > the > > > > entry > > > > > > log. > > > > > > > > > > > > Matteo > > > > > > > > > > > > On Fri, Feb 26, 2016 at 12:13 PM Arun M. Krishnakumar < > > > > > [email protected]> > > > > > > wrote: > > > > > > > > > > > >> Hi, > > > > > >> > > > > > >> (I am new to bookkeeper, so please forgive my ignorance if there > > is > > > > > >> something fundamental I'm missing). > > > > > >> > > > > > >> When working with bookkeeper and making entries we would like to > > be > > > > > able to > > > > > >> see entries flushed to disk and then examine them using existing > > > shell > > > > > >> commands (for debugging and test purposes). > > > > > >> > > > > > >> We typically use the "localbookie" command-line option and need > to > > > > have > > > > > a > > > > > >> way to know if an entry written has made it correctly to > > bookkeeper > > > > and > > > > > the > > > > > >> disk. > > > > > >> > > > > > >> Currently the ways we are planning to do this are: > > > > > >> 1. To modify the configuration to set very low thresholds for > > > > flushing. > > > > > >> 2. Create a listener thread on the localbookie which will listen > > to > > > > > flush > > > > > >> commands and forcibly do a flush. (I know this is a hack, but > > just > > > > > putting > > > > > >> it out there) > > > > > >> > > > > > >> Is there a cleaner way to do this ? I think people may have > wanted > > > > some > > > > > >> similar functionality in the past. > > > > > >> > > > > > >> Thanks, > > > > > >> Arun > > > > > >> > > > > > > > > > > > > > > > > > > > > > -- > > > Jvrao > > > --- > > > First they ignore you, then they laugh at you, then they fight you, > then > > > you win. - Mahatma Gandhi > > > > > >
