Hi all,
I want to know how to authenticate Cassandra users for multiple instances
with Java driver.
For instance, each thread creates a instance to access Cassandra with
authentication.
As the implementation example, only the first constructor builds a cluster
and a session.
Other constructors us
Hi all,
I have a cluster of three nodes and would like to ask some questions about the
performance.
I wrote a small benchmarking tool in java that mirrors (read, write) operations
that we do in the real project.
Problem is that it is not scaling like it should. The program runs two tests:
o
In Jeff Jirsa C* 2016 summit presentation, TimeWindowCompactionStrategy for
Time Series Workloads, there is a slide which talks about optimizations. It
says to align partition keys to your TWCS windows. Is it generally the case
that calendar/date based partitions would align nicely with TWCS window
I am trying to restore functionality of a cluster that got into a really
bad state of schema disagreements. Right now, I am at a point where I have
a single node up and I am trying to replicate data from there.
I am then trying to bring up a second node, where I deleted all Cassandra
data. The node
Hi,
I have deployed DSE cassandra with spark cluster in multiple region (east and
west) on ec2.
Each region has 2 nodes.
For my setup I have seed following observation
1.spark master is elected for both the region
2.spark workers from registering with himself with respective master in
particular
Alright. Thanks a lot for that information!
2017-02-06 14:35 GMT+01:00 Avi Kivity :
> It is a bug. In some contexts, the kernel needs to be able to reclaim
> memory instantly, but this is not one of them. Here, the java process is
> creating a new thread, and the kernel is allocating 16kB for i
It is a bug. In some contexts, the kernel needs to be able to reclaim
memory instantly, but this is not one of them. Here, the java process
is creating a new thread, and the kernel is allocating 16kB for its
kernel stack; that is a regular allocation, not atomic. If you decide
the gfp_mask va
Some people compact memory in cron jobs with: echo 1 > /proc/sys/vm/
compact_memory
to defragment the ram. Try this on a sacrified server first :)
On Thu, Jan 26, 2017 at 6:36 AM, Benjamin Roth
wrote:
> Hi there,
>
> We installed 2 new nodes these days. They run on ubuntu (Ubuntu 16.04.1
> LTS)
Thanks for the reply. We got rid of the OOMs by increasing
vm.min_free_kbytes, it's default of approx 90mb is maybe a bit low for
systems with 128GB.
I guess the OOM happens because the kernel could not reclaim enough paged
memory instantly.
I can't tell if this is really a kernel bug or not. It al
On 01/26/2017 07:36 AM, Benjamin Roth wrote:
Hi there,
We installed 2 new nodes these days. They run on ubuntu (Ubuntu
16.04.1 LTS) with kernel 4.4.0-59-generic. On these nodes (and only on
these) CS gets killed by the kernel due to OOM. It seems very strange
to me because, CS only takes rou
Hi,
Well, I guess knowing the disk behaviour would be useful to understand if
it is really filling up and why.
- What is the disk capacity?
- Does it actually fill up?
- If it is filling up, it might mean that all your nodes are not running
with enough available space and that any node c
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