It's important to note that this answer differs quite significantly depending on whether you're talking about Cassandra < 3.0 or >= 3.0
DataStax has a good article on < 3.0: http://docs.datastax.com/en/cassandra/2.0/cassandra/architecture/architecturePlanningUserData_t.html The Last Pickle has a good article on >= 3.0 (it's a lot more nuanced): http://thelastpickle.com/blog/2016/03/04/introductiont-to-the-apache-cassandra-3-storage-engine.html On Thu, Sep 8, 2016 at 12:12 PM Oleksandr Petrov <oleksandr.pet...@gmail.com> wrote: > You can find the information about that in Cassandra source code, for > example. Search for serializers, like BytesSerializer: > https://github.com/apache/cassandra/blob/trunk/src/java/org/apache/cassandra/serializers/BytesSerializer.java > to > get an idea how the data is serialized. > > But I'd also check out classes like Cell and SSTable structure to get an > overview on what's the data layout. > > On Thu, Sep 8, 2016 at 4:23 AM Alexandr Porunov < > alexandr.poru...@gmail.com> wrote: > >> Hello, >> >> Where can I find information about overhead of data types in cassandra? >> I am interested about blob, text, uuid, timeuuid data types. Does a blob >> type store a value with the length of the blob data? If yes then which type >> of the length it is using (int, bigint)? >> If I want to store 80 bits how much of disk space will be used for it? If >> I want to store 64 bits is it better to use bigint? >> >> Sincerely, >> Alexandr >> > -- > Alex Petrov >
