Web Console Request Log display unusable under load
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Key: SLING-1872
URL: https://issues.apache.org/jira/browse/SLING-1872
Project: Sling
Issue Type: Bug
Components: Engine
Affects Versions: Engine 2.1.0
Reporter: Felix Meschberger
The Web Console plugin to list the recent requests processed by Sling does not
properly work.
This plugin internally uses a rotating buffer of recent requests and displays
information about these buffer entries. Access to a single entry then takes
place with the numeric index into this buffer. This of course fails under load
when the rotating buffer is constantly being overwritten.
We should devise another mechanism to show information on requests. One option
would be an LRU Cache, which is indexed by some unique key, which is never
reused (may well be a steadily growing number, of course). Requests then happen
by using the key.
Under load the plugin can then either cope by allowing a bigger cache size
(e.g. temporarily increasing the size) but at least handle the case of a
request having fallen off the cache more gracefully.
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