inconsistencies in the stats system - there are incorrect assumtions on
sychronization between threads
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Key: TS-162
URL: https://issues.apache.org/jira/browse/TS-162
Project: Traffic Server
Issue Type: Bug
Components: Stats
Affects Versions: 2.0.0a
Reporter: Bryan Call
There is a problem with the current stats being inconsistent. The problem is
that the net threads each have their own stats which they modify and the
aggregation thread also modifies the same stat value. There is no proper
synchronization for this to work correctly. The aggregation thread does an
atomic swap to zero the net threads stat value, but the local thread doesn't
use atomics and only increments the value. This will lead to inconsistencies...
A better design is to *only* have the net threads modify their local stats and
have the aggregation thread handle totalling the values in a separate stat
structure.
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