This would be good to support backward and forward versions.
> On Jan 17, 2014, at 11:23 AM, Matei Zaharia <[email protected]> wrote: > > Also I should say with this that 1.0 will stay on Scala 2.10, and more > generally I think we want to keep having releases for Scala 2.10 at least for > this year. It should be easier to cross-build future releases for both 2.10 > and 2.11 than it was with the 2.9 -> 2.10 jump. > > Matei > >> On Jan 17, 2014, at 11:22 AM, Matei Zaharia <[email protected]> wrote: >> >> What file system do you have? One thing we’ve observed is that ext3, which >> is the default on ephemeral disks on EC2, scales very poorly to multicore >> workloads. We recommend reformatting those as XFS (which is very fast to >> format) or ext4 (which unfortunately takes a few hours to finalize). Maybe >> there are also other FS options that affect SSDs. >> >> Matei >> >>> On Jan 17, 2014, at 8:01 AM, Andrew Ash <[email protected]> wrote: >>> >>> Are there different amounts of RAM on the SSD machines vs the Spinny disk >>> machines? >>> >>> Sent from my mobile phone >>>> On Jan 17, 2014 5:22 AM, "Jay" <[email protected]> wrote: >>>> >>>> OS memory cache?? >>>> >>>> Sent from my iPad. >>>> >>>>> 在 2014年1月16日，上午6:04，Chen Jin <[email protected]> 写道： >>>>> >>>>> Dear Spark developers: >>>>> >>>>> We are benchmarking spark operations such as filter, group, join on >>>>> ssd instance i2.2xlarge on EC2. Most operations are similar or >>>>> slightly better than ephemeral disks on EC2, however, the performance >>>>> of group operation on SDD are much worse than regular disks, at least >>>>> 2x to 3x worse. Could any of you shed some lights on this behavior? >>>>> >>>>> Thanks a lot, >>>>> >>>>> -chen >
