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https://issues.apache.org/jira/browse/TS-1963?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13709920#comment-13709920
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Alan M. Carroll commented on TS-1963:
-------------------------------------
I checked the commit for TS-1339 (84fa7a, iocore/cache/I_CacheDefs.h) and the
cache version was changed. I installed 3.2.5 with a cleared cache and ran it to
get some TCP_HITS (objects in cache). I then installed trunk without clearing
the cache and ran it without any problems. I checked the diags.log file and it
contained the messages
{noformat}
[Jul 16 11:38:19.191] Server {0x2aaaabdb8700} NOTE: using directory A for
'/opt/ats/var/trafficserver/cache.db 16384:253951'
[Jul 16 11:38:19.252] Server {0x2aaaabab5700} WARNING: bad footer in cache
directory for '/opt/ats/var/trafficserver/cache.db 16384:253951', clearing
[Jul 16 11:38:19.252] Server {0x2aaaabab5700} NOTE: clearing cache directory
'/opt/ats/var/trafficserver/cache.db 16384:253951'
[Jul 16 11:38:19.274] Server {0x2aaaabcb7700} NOTE: cache enabled
{noformat}
I did a query for one of the objects that had returned a TCP_HIT and got a
TCP_MISS indicating the cache had been cleared.
> upgrade the version number for cache between 3.2.x and 3.4.x
> ------------------------------------------------------------
>
> Key: TS-1963
> URL: https://issues.apache.org/jira/browse/TS-1963
> Project: Traffic Server
> Issue Type: Bug
> Components: Cache
> Affects Versions: 3.3.4
> Reporter: Bryan Call
> Assignee: Alan M. Carroll
> Fix For: 3.3.5
>
>
> If you don't remove the cache between versions I have seen weird behavior on
> trying to get locks for reading from cache:
> perf top output:
> {code}
> Samples: 379K of event 'cycles', Event count (approx.): 159277054084
> 20.54% libpthread-2.12.so [.] pthread_mutex_trylock
> 10.59% traffic_server [.] CacheVC::openReadStartHead(int, Event*)
> 5.49% traffic_server [.]
> MutexTryLock::MutexTryLock(ProxyMutex*, EThread*)
> 3.39% libtsutil.so.3 [.] ink_freelist_new
> 3.17% traffic_server [.] EThread::process_event(Event*, int)
> 3.06% [kernel] [k] _spin_lock_bh
> 2.56% libtsutil.so.3 [.] ink_freelist_free
> 1.48% [kernel] [k] _spin_lock
> 1.46% traffic_server [.] EThread::execute()
> 1.44% libpthread-2.12.so [.] pthread_mutex_unlock
> 1.33% [kernel] [k] copy_user_generic_string
> 1.22% traffic_server [.] Ptr<ProxyMutex>::operator=(ProxyMutex*)
> {code}
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