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From Apache Wiki <wikidi...@apache.org>
Subject [Jackrabbit Wiki] Update of "Oakathon August 2017" by MarcelReutegger
Date Wed, 23 Aug 2017 08:20:15 GMT
Dear Wiki user,

You have subscribed to a wiki page or wiki category on "Jackrabbit Wiki" for change notification.

The "Oakathon August 2017" page has been changed by MarcelReutegger:
https://wiki.apache.org/jackrabbit/Oakathon%20August%202017?action=diff&rev1=38&rev2=39

  
  === API draft ===
   * Whiteboard shot of the [[attachment:IMG_20170822_163256.jpg|API entities]] identified
so far. 
-  * [[https://github.com/mduerig/oak-tooling-api|Drafting of the API]] takes place on Github
for now. We'll move to the Apache SVN as soon as considered mature enough. 
+  * [[https://github.com/mduerig/oak-tooling-api|Drafting of the API]] takes place on Github
for now. We'll move to the Apache SVN as soon as considered mature enough.
  
+ == Metrics ==
+ 
+ A metrics reporter using RRD4J has been implemented in Apache Sling ([[https://issues.apache.org/jira/browse/SLING-7055|SLING-7055]]).
It writes metrics periodically into a time-series database on the local file system.
+ 
+ === Open questions ===
+  * How expensive is it to gather metrics? What if reading a metric is too expensive because
the custom metric implementation is troublesome? Should the reporter detect and blacklist
such metrics? Alternatively, the reporter could automatically increase the interval for reading
such metrics.
+  * It would be useful to also have RRD archives with MAXIMUM consolidation function. E.g.
for tracking the observation queue length.
+  * How should timer and histogram metrics be written to RRD? Those are not simple values,
but expose already aggregated data.
+ 
+ === More metrics ===
+ It may be useful to have more metrics OOTB in Oak.
+ 
+  * MongoDB metrics exposed by the MongoDocumentStore (storage size, free blocks, caches,
etc.)
+  * RDB metrics exposed by the RDBDocumentStore
+ 
+ Other areas?
+ 

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