>
> I observe long running nodes have high non heap memory footprint then a
> recently started node. That is the reason I am interested in find non heap
> memory usage by Cassandra node. What could be the reason of high non heap
> memory footprint in long running cluster?
>
Memory utilisation
I observe long running nodes have high non heap memory footprint then a
recently started node. That is the reason I am interested in find non heap
memory usage by Cassandra node. What could be the reason of high non heap
memory footprint in long running cluster?
Regards
Himanshu
On Sat, Apr 11,
Hi Himanshu,
On Sat, Apr 11, 2020 at 8:47 PM HImanshu Sharma
wrote:
> I am not worried about page cache. I want to monitor memory pressure, I want
> to check that if heap+non heap usage goes above certain level then I can take
> certain action. But due to this page cache thing, I am not sure
Nodetool isn't really meant for monitoring usage.
There are a number of existing tools to grab and track jvm heap usage.
Enable JMX and pull the info into something custom, or using a grafana
template, for instance, which usually uses JMX internally.
ie. this one graphs heap usage
For some simple and helpful explanations of the behavior you are
observing, some ideas on what to look for in monitoring, as well as some
interesting experiments on the "play" page (last link), have a look at
https://www.linuxatemyram.com/ - this is general linux memory behavior
and not unique
Hi
I am not worried about page cache. I want to monitor memory pressure, I
want to check that if heap+non heap usage goes above certain level then I
can take certain action. But due to this page cache thing, I am not sure
how to find actual memory usage( heap and off heap). Heap will not be more
Hi,
You can read section 'OS Page Cache Usage' on
http://cassandra.apache.org/doc/latest/troubleshooting/use_tools.html
Also, don't worry about memory usage (page cache) not decreasing even if no
traffic ...it will come down when required (for example: a new application
needs it when boot up).
Hi
I am observing memory usage in top command, but there in RSS it is showing
18G ( which I think is sum of used memo + page cache). I want to know how
to find how much used by Cassandra process and how much of it is in page
cache. I want this information because I want to check memory usage for
You can look at top command. There is column of memory
Regards,
Nitan
Cell: 510 449 9629
> On Apr 11, 2020, at 11:10 AM, HImanshu Sharma
> wrote:
>
>
> Hi
>
> But I see memory not decreasing even if there is no traffic on cluster. How
> can I find actual memory usage by Cassandra
Hi
But I see memory not decreasing even if there is no traffic on cluster. How
can I find actual memory usage by Cassandra process. If it is OS page
cache then how to find how much is page cache and how much is used by
process?
Thanks
Himanshu
On Sat, Apr 11, 2020 at 9:07 PM Laxmikant
It is OS page cache used during read..your os will leverage memory if not
being used by any other applications and it improves your read performance.
On Sat, Apr 11, 2020, 12:47 PM HImanshu Sharma
wrote:
> Hi
>
> I am very new to the use of cassandra. In a cassandra cluster of 3 nodes,
> I am
Hi
I am very new to the use of cassandra. In a cassandra cluster of 3 nodes, I
am observing memory usage of cassandra process going more than the heap
memor allocated. As I understand, cassandra allocates off heap memory for
bloom filters, index summary etc.
When I run nodetool info, I see off
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