On Tue, May 20, 2014 at 1:24 PM, Terje Marthinussen <tmarthinus...@gmail.com > wrote:
> Journal enabled is faster on almost all operations. > > Good to know, thanks! > Recovery here is more about saving you from waiting 1/2 hour from a > traditional full file system check. > > On an EC2 environment you normally lose the machine anyway on failures, so that's not of much use in that case. > Feel free to wait if you want though! :) > > Regards, > Terje > > On 21 May 2014, at 01:11, Paulo Ricardo Motta Gomes < > paulo.mo...@chaordicsystems.com> wrote: > > Thanks for the links! > > Forgot to mention, using XFS here, as suggested by the Cassandra wiki. But > just double checked and it's apparently not possible to disable journaling > on XFS. > > One of ours sysadmin just suggested disabling journaling, since it's > mostly for recovery purposes, and Cassandra already does that pretty well > with commitlog, replication and anti-entropy. It would anyway be nice to > know if there could be any performance benefits from it. But I personally > don't think it would help much, due to the append-only nature of cassandra > writes. > > > On Tue, May 20, 2014 at 12:43 PM, Michael Shuler > <mich...@pbandjelly.org>wrote: > >> On 05/20/2014 09:54 AM, Samir Faci wrote: >> >>> I'm not sure you'd be gaining much by doing this. This is probably >>> dependent on the file system you're referring to when you say >>> journaling. There's a few of them around, >>> >>> You could opt to use ext2 instead of ext3/4 in the unix world. A quick >>> google search linked me to this: >>> >> >> ext2/3 is not a good choice for file size limitation and performance >> reasons. >> >> I started to search for a couple links, and a quick check of the links I >> posted a couple years ago seem to still be interesting ;) >> >> http://mail-archives.apache.org/mod_mbox/cassandra-user/ >> 201204.mbox/%3c4f7c5c16.1020...@pbandjelly.org%3E >> >> (repost from above) >> >> Hopefully this is some good reading on the topic: >> >> https://www.google.com/search?q=xfs+site%3Ahttp%3A%2F% >> 2Fmail-archives.apache.org%2Fmod_mbox%2Fcassandra-user >> >> one of the more interesting considerations: >> http://mail-archives.apache.org/mod_mbox/cassandra-user/201004.mbox/% >> 3ch2y96b607d1004131614k5382b3a5ie899989d62921...@mail.gmail.com%3E >> >> http://wiki.apache.org/cassandra/CassandraHardware >> >> http://wiki.apache.org/cassandra/LargeDataSetConsiderations >> >> http://www.datastax.com/dev/blog/questions-from-the-tokyo- >> cassandra-conference >> >> -- >> Kind regards, >> Michael >> > > > > -- > *Paulo Motta* > > Chaordic | *Platform* > *www.chaordic.com.br <http://www.chaordic.com.br/>* > +55 48 3232.3200 > > -- *Paulo Motta* Chaordic | *Platform* *www.chaordic.com.br <http://www.chaordic.com.br/>* +55 48 3232.3200
