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1. Improvement of text for "refresh cache". Reviewed by Joseph B.

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tankchintan 2011-07-21 21:08:14 +00:00
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productMods/templates/freemarker/visualization/tools.ftl
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@ -8,24 +8,19 @@
<a href="${refreshCacheURL}">Refresh Cached Models for Visualization</a>
<h5>Why</h5>
Certain class of visualizations like Temporal graph and Map of Science that work on a large scale
attempt to calculate counts of publications (or grants) for all the organizations within an organization.
These queries tend to be both memory intensive and time consuming. In order to provide a good user experience when
these visualizations are served we decided to save the results of these queries to be reused later.
Large-scale visualizations like the Temporal Graph or the Map of Science involve calculating total counts of publications or
of grants for some entity. Since this means checking also through of its all sub-entities, the underlying queries can be both
memory-intensive and time-consuming. For a faster user experience, we wish to save the results of these queries for later re-use.
<h5>What</h5>
To this end we have devised a caching solution which will store information about the organization
hierarchy, which publications were published from which organizations etc (among other things) in
semantic way (i.e. we store the rdf model).<br/>
We're currently caching these models in-memory, which works nicely, for now. Currently the cache is only built
once, on first user request after a server restart, so the visualization will essentially never be updated
until the server is restarted again. It is not being updated real-time or periodically. This means that the data in these
models might be stale depending upon when was it last created. In future releases we will come
up with a solution that stores these models on disk and be updated periodically.<br />
To this end we have devised a caching solution which will retain information about the hierarchy of organizations-namely,
which publications are attributed to which organizations-by storing the RDF model. <br />
We're currently caching these models in memory. The cache is built (only once) on the first user request after a server restart.
Because of this, the same model will be served until the next restart. This means that the data in these models may become stale
depending upon when it was last created. This works well enough for now. In future releases we will improve this solution so that
models are stored on disk and periodically updated.
<h5>How</h5>
To refresh these models either restart the server or click on "refresh cache" link above. We realize that
in production VIVO instances it is not feasible to restart the server to refresh these models. Hence we
recommend the above link. Administrators can use this link to trigger regeneration of all the existing
models.<br />
The models are refreshed each time the server restarts. Since this is not generally practical on production instances,
administrators can instead use the “refresh cache” link above to do this without a restart.
<br />