Sorry for my continued questioning, by now I must have bored everyone about this topic. I have one last question: how do you create such an index? I found only ColumnFamilyStoreText.testIndexCreate(), but it appears that this uses internal API, and thus cannot be invoked from a client side or through JMX, right? From there on I should be able to find my way around the system :-)
On Thu, Sep 30, 2010 at 4:56 PM, Stu Hood <stu.h...@rackspace.com> wrote: > Take a look at the get_indexed_slices method in the 0.7.0-beta Thrift > interface. > > -----Original Message----- > From: "Christian Decker" <decker.christ...@gmail.com> > Sent: Thursday, September 30, 2010 4:38am > To: user@cassandra.apache.org > Subject: Re: LongType from user input > > I just read through the tickets on Jira, and it appears that indices are > implemented in the 0.7 source tree, but I cannot find any pointer on how to > use them. I'll be trying to create a custom CassandraStorage that loads > data > through the indices, anyone else interested? > > Regards, > Chris > > On Thu, Sep 30, 2010 at 10:56 AM, Aaron Morton <aa...@thelastpickle.com > >wrote: > > > AFAIK indexes are still in dev. The only example is in the > system_tests.py > > in the source tree. > > > > Aaron > > > > > > On 30 Sep 2010, at 20:10, Christian Decker <decker.christ...@gmail.com> > > wrote: > > > > Apparently I have blanked the 0.7 completely out of my memory. I was > trying > > to implement application layer indices and ignored the fact that > Cassandra > > 0.7 is implementing them by default. I found ticket CASSANDRA-749 about > the > > indices and am reading through the code right now, but is there a higher > > level overview and a tutorial on how to get things started with these > > indices (and maybe some inner workings)? This might actually solve all of > my > > problems I'm having right now :-) > > > > Regards, > > Chris > > > > > > On Mon, Sep 27, 2010 at 3:45 AM, Aaron Morton < <aa...@thelastpickle.com > > > > aa...@thelastpickle.com> wrote: > > > >> The only thing I can think of is that values need to be in the correct > >> byte format when used in indexes in 0.7. Take a look at the types.py > module > >> in the pycassa client <http://github.com/pycassa/pycassa> > >> http://github.com/pycassa/pycassa for an example of which values need > to > >> be byte packed. > >> > >> How is your pig function working against cassandra? Is it using the > >> ColumnFamilyRecordReader? . The code in the internal RowIterator for > that > >> class has an example calling the cluster to get to the comparators. > >> > >> Aaron > >> > >> > >> On 27 Sep, 2010,at 03:11 AM, Christian Decker << > decker.christ...@gmail.com> > >> decker.christ...@gmail.com> wrote: > >> > >> Hi Aaron, > >> > >> what changes can I expect in the 0.7 release regarding Comparison and > >> Parameters? My problem is mainly that I want to take Strings from stdin > (or > >> Pig Scripts for that matter) and convert them in such a way that they > are > >> interpreted correctly and converted to the corresponding byte > representation > >> to use them in column names and keys. > >> > >> Regards, > >> Chris > >> > >> On Sun, Sep 26, 2010 at 5:20 AM, Aaron Morton < < > aa...@thelastpickle.com> > >> aa...@thelastpickle.com> wrote: > >> > >>> Things a changing in v0.7, the row keys are byte arrays. > >>> > >>> Not sure I understand your other concerns. > >>> > >>> Aaron > >>> > >>> > >>> On 25 Sep 2010, at 08:10, Christian Decker << > decker.christ...@gmail.com> > >>> decker.christ...@gmail.com> wrote: > >>> > >>> > >>> Thanks for your quick answer, I think I'll use an affix to sort of cast > >>> the keys, ranges and others from their textual representation (from > Pig) to > >>> the desired byte representation, since I just noticed that the keys for > the > >>> rows themselfs are always UTF8 interpreted, and since I want to make > >>> key-range as well as slice queries, I'll be better off this way I > think. > >>> I'll just add a 'L' for Long and 'U' for UUID (of any kind). > >>> Or is there a better way that I just can't see from my beginners > angle? > >>> :-)thing > >>> > >>> Regards, > >>> Chris > >>> > >>> > >>> On Fri, Sep 24, 2010 at 6:35 PM, Tyler Hobbs < <ty...@riptano.com>< > ty...@riptano.com> > >>> ty...@riptano.com> wrote: > >>> > >>>> Yes, you can use describe_keyspace() and then look through the > results. > >>>> It's a little ugly in 0.6, but it works > >>>> > >>>> - Tyler > >>>> > >>>> > >>>> > >>>> On Fri, Sep 24, 2010 at 11:25 AM, Christian Decker << > decker.christ...@gmail.com><decker.christ...@gmail.com> > >>>> decker.christ...@gmail.com> wrote: > >>>> > >>>>> Well I'm writing a loading function for Pig, and as it happens I want > >>>>> to be able to load slices from cassandra which are specified in the > pig > >>>>> script (thus the input from stdin) but the ColumnFamily from which to > read > >>>>> the data is another parameter and some of the CFs have UTF8, UUID, > TimeUUID > >>>>> or Long types for their keys and columns, so simply converting > everything I > >>>>> get to an 8byte long would break compatibility with the others. > >>>>> Now thinking about it I attacked the whole problem in a weird way, > >>>>> since UUID types won't work either. > >>>>> So let me change my question slightly, is there a way in 0.6 to > detect > >>>>> the compareWith type on a running cluster? That way I could convert > it to > >>>>> the right type :D > >>>>> > >>>>> Regards, > >>>>> Chris > >>>>> > >>>>> > >>>>> On Fri, Sep 24, 2010 at 6:09 PM, Tyler Hobbs < <ty...@riptano.com>< > ty...@riptano.com> > >>>>> ty...@riptano.com> wrote: > >>>>> > >>>>>> I'm not sure I understand why using this with multiple column > families > >>>>>> prevents you from converting it. Could you clarify this? > >>>>>> > >>>>>> > >>>>>> > >>>>>> On Fri, Sep 24, 2010 at 10:56 AM, Christian Decker << > decker.christ...@gmail.com><decker.christ...@gmail.com> > >>>>>> decker.christ...@gmail.com> wrote: > >>>>>> > >>>>>>> Hi all, > >>>>>>> > >>>>>>> I'm having quite a dilemma with the CompareWith attribute. The > >>>>>>> Problem is that I have numeric IDs that I'd like to use as row > keys, only > >>>>>>> that I also have to offer a possibility to let users input them > from std > >>>>>>> input. Since I cannot ask my users to input an 8byte sequence > representing > >>>>>>> the ID they'd like, I was about to turn to UTF8, when I remembered > that they > >>>>>>> are compared lexicographically, so that 100 actually comes before > 2, which > >>>>>>> kills key slices. Also I cannot just code a converter in since this > is > >>>>>>> supposed to be a used with multiple columnfamilies, so just > converting an > >>>>>>> integer read into 8bytes isn't going to work either. > >>>>>>> Any tricks for this one? > >>>>>>> > >>>>>>> Regards, > >>>>>>> Chris > >>>>>>> > >>>>>> > >>>>>> > >>>>> > >>>> > >>> > >> > > > > >
