Re: JNA + Cassandra security
On Mon, Apr 30, 2012 at 6:48 PM, Jonathan Ellis jbel...@gmail.com wrote: On Mon, Apr 30, 2012 at 7:49 PM, Cord MacLeod cordmacl...@gmail.com wrote: Hello group, I'm a new Cassandra and Java user so I'm still trying to get my head around a few things. If you've disabled swap on a machine what is the reason to use JNA? Faster snapshots, giving hints to the page cache with fadvise. If you are running in Linux, you really do want this enabled. Otherwise, for example, compaction blows out your page cache. (FWIW, in case it is not immediately apparent what sort of hints Cassandra might give to the page cache with fadvise..) https://issues.apache.org/jira/browse/CASSANDRA-1470 =Rob -- =Robert Coli AIMGTALK - rc...@palominodb.com YAHOO - rcoli.palominob SKYPE - rcoli_palominodb
JNA + Cassandra security
Hello group, I'm a new Cassandra and Java user so I'm still trying to get my head around a few things. If you've disabled swap on a machine what is the reason to use JNA? A second question is doesn't JNA break the Java inherent security mechanisms by allowing access to direct system calls outside of the JVM? Are there any concerns around this?
Re: JNA + Cassandra security
If you've disabled swap on a machine what is the reason to use JNA? JNA will still be used to efficiently make hard links for snapshots. It's not necessary to lock the JVM memory when swap is disabled. A second question is doesn't JNA break the Java inherent security mechanisms by allowing access to direct system calls outside of the JVM? Are there any concerns around this? Anyone else have an answer? Cheers - Aaron Morton Freelance Developer @aaronmorton http://www.thelastpickle.com On 1/05/2012, at 12:49 PM, Cord MacLeod wrote: Hello group, I'm a new Cassandra and Java user so I'm still trying to get my head around a few things. If you've disabled swap on a machine what is the reason to use JNA? A second question is doesn't JNA break the Java inherent security mechanisms by allowing access to direct system calls outside of the JVM? Are there any concerns around this?
Re: JNA + Cassandra security
On Mon, Apr 30, 2012 at 7:49 PM, Cord MacLeod cordmacl...@gmail.com wrote: Hello group, I'm a new Cassandra and Java user so I'm still trying to get my head around a few things. If you've disabled swap on a machine what is the reason to use JNA? Faster snapshots, giving hints to the page cache with fadvise. A second question is doesn't JNA break the Java inherent security mechanisms by allowing access to direct system calls outside of the JVM? Are there any concerns around this? We're not trying to sandbox anything here; there's lots of places where we explicitly allow arbitrary Java code to be injected into Cassandra. You don't need native code to do dangerous things with that! -- Jonathan Ellis Project Chair, Apache Cassandra co-founder of DataStax, the source for professional Cassandra support http://www.datastax.com
