Client-side sorting

2010-10-09 Thread cbert...@libero.it
Hi all, do you know any component for client-side sorting of cassandra structures? Like order groups of SuperColumn on the base of a value of SubColumn and similar operations? (ordering by asciitype/bytestype and so on) ... Do you know anything like this? I'd like to avoid DTO/VO pattern + Compara

Re: Dazed and confused with Cassandra on EC2 ...

2010-10-09 Thread Peter Schuller
> Heap *shrinkage* on the other hand is another matter and for both CMS > and G1, shrinkage never happens except on Full GC, unfortunately. I'm And to be clear, the implication here is that shrinkage normally doesn't happen. The implication is *not* that you see fallbacks to full GC for the purpos

Re: Dazed and confused with Cassandra on EC2 ...

2010-10-09 Thread Peter Schuller
> The main reason to set Xms=Xmx is so mlockall can tag the entire heap > as "don't swap this out" on startup.  Secondarily whenever the heap > resizes upwards the JVM does a stop-the-world gc, but no, not really a > big deal when your uptime is in days or weeks. I'm not sure where this is coming

Re: using jna.jar "Unknown mlockall error 0"

2010-10-09 Thread Peter Schuller
> IIRC, mlockall doesn't work as a non root user on Linux. Memory locking is permitted for non-root on modern Linux, but is subject to resource limitations (ulimit -l). I believe this also applies to mlockall() (and not just mlock()), provided that you lock MCL_CURRENT rather than MCL_FUTURE (Cass