Configuring memcached for a particular scenario

Posted by pradeepchhetri on Server Fault See other posts from Server Fault or by pradeepchhetri
Published on 2012-12-15T14:01:45Z Indexed on 2012/12/15 17:05 UTC
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php

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memcached

I have a web application which queries opentsdb server(which in backend using Hbase cluster) for the datapoints of different metrics and using dygraph javascript graphing library, I am plotting those metrics. Since getting all the datapoints of past one day from opentsdb for a particular metric is itself taking nearly 2 seconds, my application which is plotting nearly 25 metrics is becoming very slow.

In order to reduce this latency, I am thinking of using memcached module of php5 for caching all the queries. But I have few questions regarding memcached.

Is there any way I can configure memcache to keep on updating its cache in the background by running some command line queries after particular interval of time.
Is there any way I can configure memcache to always reply for a query using cache instead of first updating its cache because my application just plots datapoints for past one day. Missing out some datapoints is not that critical.

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