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From Daniel Steuernol <dan...@sendwithus.com>
Subject Re: Restarting nodes and reported load
Date Tue, 30 May 2017 16:48:20 GMT
I should also mention that I am running cassandra 3.10 on the cluster<br><br><signature></signature>
          <div class="gmail_quote nylas-quote nylas-quote-id-6e680bb5d931e264798f086d2c24186d5b3721b269a95f9c19987b17d27dd95e">
            <br>
            On May 29 2017, at 9:43 am, Daniel Steuernol &lt;daniel@sendwithus.com&gt;
wrote:
            <br>
            <blockquote class="gmail_quote"
              style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
              The cluster is running with RF=3, right now each node is storing about 3-4 TB
of data. I'm using r4.2xlarge EC2 instances, these have 8 vCPU's, 61 GB of RAM, and the disks
attached for the data drive are gp2 ssd ebs volumes with 10k iops. I guess this brings up
the question of what's a good marker to decide on whether to increase disk space vs provisioning
a new node?<br /><br />
          <div>
            <br />
            On May 29 2017, at 9:35 am, tommaso barbugli &lt;tbarbugli@gmail.com&gt;
wrote:
            <br />
            <blockquote style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
              <div dir="ltr">Hi Daniel,<div><br /></div><div>This
is not normal. Possibly a capacity problem. Whats the RF, how much data do you store per node
and what kind of servers do you use (core count, RAM, disk, ...)?</div><div><br
/></div><div>Cheers,</div><div>Tommaso</div></div><div><br
/><div>On Mon, May 29, 2017 at 6:22 PM, Daniel Steuernol <span dir="ltr">&lt;<a
href="mailto:daniel@sendwithus.com" target="_blank">daniel@sendwithus.com</a>&gt;</span>
wrote:<br /><blockquote style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><br
/>I am running a 6 node cluster, and I have noticed that the reported load on each node
rises throughout the week and grows way past the actual disk space used and available on each
node. Also eventually latency for operations suffers and the nodes have to be restarted. A
couple questions on this, is this normal? Also does cassandra need to be restarted every few
days for best performance? Any insight on this behaviour would be helpful.<u></u><u></u><div><br
/></div><div>Cheers,</div><div>Daniel</div>

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</blockquote></div><br /></div>

            </blockquote>
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