prior BZ59274 "fix" can result in a partition being cleared unnecessarily
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Key: TS-39
URL: https://issues.apache.org/jira/browse/TS-39
Project: Traffic Server
Issue Type: Bug
Components: Cache
Environment: All
Reporter: John Plevyak
Priority: Minor
The prior fix for BZ59274 clears the cache partition if recovery gets into a
loop. This can occur if the last_write_pos == skip + len
(the end of the cache partition). This can occur because the code which
updates wraps the write_pos does so when it attempts
the next write. The solution is to check for this at the top of recover and
wrap recovery. Also, the variable which the prior patch used
"prev_recover_pos" is stored in the CachePart when it is a purely local
variable. I would suggest leaving in the check (it doesn't hurt
if it never detects a problem). Patch forthcoming.
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