Hi Colin, Yes, we don't want to use the C* in-memory, we just want to mount the keyspace data directory to RAM instead of leaving it on the spinning disks.
My question is more related to the technical side of mounting the keyspace data folder to the ram memory than checking if Cassandra has some in-memory feature. My intention is to understand if mounting a keyspace data directory to RAM could cause any technical problems... On our point of it shouldn't, as we are just "moving" the directory to be stored on RAM instead of the spinning disks. Thanks so much. > Em 02/02/2015, às 05:15, Colin <co...@clark.ws> escreveu: > > Until the in-memory option stores data off heap, I would strongly recommend > staying away from this option. This was a marketing driven hack in my > opinion. > > -- > Colin Clark > +1 612 859 6129 > Skype colin.p.clark > >> On Feb 2, 2015, at 5:31 AM, Jan <cne...@yahoo.com> wrote: >> >> HI Gabriel; >> >> I don't think Apache Cassandra supports in-memory keyspaces. >> However Datastax Enterprise does support it. >> >> Quoting from Datastax: >> DataStax Enterprise includes the in-memory option for storing data to and >> accessing data from memory exclusively. No disk I/O occurs. Consider using >> the in-memory option for storing a modest amount of data, mostly composed of >> overwrites, such as an application for mirroring stock exchange data. Only >> the prices fluctuate greatly while the keys for the data remain relatively >> constant. Generally, the table you design for use in-memory should have the >> following characteristics: >> Store a small amount of data >> Experience a workload that is mostly overwrites >> Be heavily trafficked >> Using the in-memory option | DataStax Enterprise 4.0 Documentation >> >> >> >> >> >> >> Using the in-memory option | DataStax Enterprise 4.0 Documentation >> Using the in-memory option >> View on www.datastax.com >> Preview by Yahoo >> >> >> >> hope this helps >> Jan >> >> C* Architect >> >> >> >> On Sunday, February 1, 2015 1:32 PM, Gabriel Menegatti >> <gabr...@s1mbi0se.com.br> wrote: >> >> >> Hi guys, >> >> Please, does anyone here already mounted a specific keyspace directory to >> ram memory using tmpfs? >> >> Do you see any problem doing so, except by the fact that the data can be >> lost? >> >> Thanks in advance. >> >> Regards, >> Gabriel. >> >>
