Hi Paul, I had a little research on availability of latency statistics. There are 2 types of latency values which can be retrieved from Cassandra jmx mbeans.
1) Read/write latency for keyspaces 2) Read/write latency for column families The first one is calculated by (total time spent for requests *since server started*)/(number of requests *since server started*), and the second one is calculated by (total time spent for requests *since last call to jmx mbean*)/(number of requests *since last call to jmx mbean* ). So, to have an average value for latency, it seems the first one is more suitable. So I'm going to use those values as latency. Since I have read/write counts as well, average latency for whole system can be calculated. Thanks. On Thu, May 9, 2013 at 3:52 PM, Paul Fremantle <[email protected]> wrote: > Very nice. Is there any way we can get average ms per read and write? I > know that is important to many users. > > Paul > > > On 9 May 2013 11:07, Bhathiya Jayasekara <[email protected]> wrote: > >> Hi Prabath, >> >> As you suggested, I wrote a simple table gadget to show other relevant >> statistics too. Comments are welcome. >> >> I'm attaching screenshots of the gadgets herewith. >> >> Thanks. >> >> >> On Thu, May 9, 2013 at 11:22 AM, Prabath Abeysekera <[email protected]>wrote: >> >>> Hi Bhathiya, >>> >>> On Thu, May 9, 2013 at 10:10 AM, Bhathiya Jayasekara >>> <[email protected]>wrote: >>> >>>> Hi devs, >>>> >>>> I started working on [1] few weeks back. The initial milestone is to >>>> implement Cassandra data publishing, analyzing and monitoring part. The >>>> billing task will be done later. Currently I have completed Cassandra disk >>>> space usage and node status monitoring implementation. So with this now, >>>> Cassandra disk space usages can be monitored in different time periods such >>>> as "in last hour", "in last day", "in last week" and in "last month". >>>> >>>> In addition to disk space usage, other statistics such as sstablecount, >>>> read and write counts etc. are also published and analyzed now, and can be >>>> added to monitoring dashboard if required. (Need to write gadgets >>>> accordingly) >>>> >>> >>> Good work. Please attach a few screenshots of the available dashboard >>> artifacts you've come up with too. Also, I believe, if possible, writing a >>> few other gadgets to display the information on read/write counts, >>> latency, sstablecounts, etc too would be helpful to make it a more complete >>> toolbox. (Referring your mail, I hope it's going to be straightforward as >>> the necessary information is already available.) >>> >>> >>>> >>>> Currently data publishing and viewing is available for super tenant >>>> only, and I'm planning to extend it to tenant level. >>>> >>>> [1] https://redmine.wso2.com/issues/1163 >>>> >>>> >>>> Thanks. >>>> >>>> -- >>>> *Bhathiya Jayasekara* >>>> *Software Engineer,* >>>> *WSO2 inc., http://wso2.com* >>>> * >>>> * >>>> *Phone: +94715478185* >>>> *LinkedIn: http://www.linkedin.com/in/bhathiyaj* >>>> *Twitter: https://twitter.com/bhathiyax* >>>> >>>> _______________________________________________ >>>> Dev mailing list >>>> [email protected] >>>> http://wso2.org/cgi-bin/mailman/listinfo/dev >>>> >>>> >>> >>> Regards, >>> Prabath >>> -- >>> Prabath Abeysekara >>> Email: [email protected] <[email protected]> >>> Mobile: +94774171471 >>> >>> <http://harshana05.blogspot.com/> >>> >> >> >> >> -- >> *Bhathiya Jayasekara* >> *Software Engineer,* >> *WSO2 inc., http://wso2.com* >> * >> * >> *Phone: +94715478185* >> *LinkedIn: http://www.linkedin.com/in/bhathiyaj* >> *Twitter: https://twitter.com/bhathiyax* >> >> _______________________________________________ >> Dev mailing list >> [email protected] >> http://wso2.org/cgi-bin/mailman/listinfo/dev >> >> > > > -- > Paul Fremantle > CTO and Co-Founder, WSO2 > OASIS WS-RX TC Co-chair, VP, Apache Synapse > > UK: +44 207 096 0336 > US: +1 646 595 7614 > > blog: http://pzf.fremantle.org > twitter.com/pzfreo > [email protected] > > wso2.com Lean Enterprise Middleware > > Disclaimer: This communication may contain privileged or other > confidential information and is intended exclusively for the addressee/s. > If you are not the intended recipient/s, or believe that you may have > received this communication in error, please reply to the sender indicating > that fact and delete the copy you received and in addition, you should not > print, copy, retransmit, disseminate, or otherwise use the information > contained in this communication. Internet communications cannot be > guaranteed to be timely, secure, error or virus-free. The sender does not > accept liability for any errors or omissions. > -- *Bhathiya Jayasekara* *Software Engineer,* *WSO2 inc., http://wso2.com* * * *Phone: +94715478185* *LinkedIn: http://www.linkedin.com/in/bhathiyaj* *Twitter: https://twitter.com/bhathiyax*
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