Re: Cassandra DSC installation fail due to some python dependecies. How to rectify ?

2014-02-17 Thread Al Tobey
original apt command. -Al Tobey Open Source Mechanic Datastax On Mon, Feb 17, 2014 at 3:21 PM, Ertio Lew ertio...@gmail.com wrote: I am trying to install cassandra dsc20 but the installation fails due to some python dependecies. How could I make this work ? root@server1:~# sudo apt-get

Re: Size Tiered - Leveled Compaction

2013-03-07 Thread Al Tobey
with CL_QUORUM. With compaction throttling enabled at any rate it just couldn't keep up. With throttling off, it runs smoothly and does not appear to have an impact on our applications, so we always leave it off, even in EC2. An 8GiB heap is too small for this config on 1.1. YMMV. -Al Tobey On Thu

Re: kswapd0 causing read timeouts

2012-06-13 Thread Al Tobey
I would check /etc/sysctl.conf and get the values of /proc/sys/vm/swappiness and /proc/sys/vm/vfs_cache_pressure. If you don't have JNA enabled (which Cassandra uses to fadvise) and swappiness is at its default of 60, the Linux kernel will happily swap out your heap for cache space. Set

Re: Much more native memory used by Cassandra then the configured JVM heap size

2012-06-13 Thread Al Tobey
Linux's default on busy IO boxes is to use all available memory for cache. Try echo 1 /proc/sys/vm/drop_caches and see if your memory comes back (this will drop vfs caches, and in my experience is safe, but YMMV). If your memory comes back, everything is normal and you should leave it alone. It