APC 3.14 cache slam error message when flushing cache

trying this.

still get the error

I was getting this-

"warning: apc_store() [function.apc-store]: Potential cache slam averted for key 'cache_menu_lookup' in .../sites/all/modules/cacherouter/engines/apc.php on line 197."

Right after a cache flush...

So I did this-

- apc_store($this->lookup, $lookup, 0);
+ @apc_store($this->lookup, $lookup, 0);

To the above mentioned file per the patch.

Now I am getting these 2 right after a cache flush-

"warning: apc_store() [function.apc-store]: Potential cache slam averted for key 'cache-context' in .../sites/all/modules/cacherouter/engines/apc.php on line 95."

These are lines 92-103 in that file

" $lookup[$this->key($key)] = $expire;

// Attempt to store full key and value
if (!apc_store($this->key($key), $cache, $ttl)) {
unset($lookup[$this->key($key)]);
$return = FALSE;
}
else {
// Update static cache
parent::set($this->key($key), $cache);
$return = TRUE;
}"

AND

"warning: unlink(/tmp/cache_lock) [function.unlink]: No such file or directory in .../sites/all/modules/cacherouter/Cache.php on line 124."

these are lines 115-126 at the very end of this file

" /**
* unlock()
* lock the cache from other writes.
*
* @param none
* @return bool
* Returns TRUE on success, FALSE on failure
*/
function unlock() {
unlink($this->lock);
}
}"

So, what's next?

Or, I guess what might be the better question, should I have added the "@" per the posted patch? Or is there a better solution? Is there some behavior that caused th original error message to occur that I could try to avoid?

Can I get a human translation of what that line was doing before and after the "@" was added? Thanks

I think we should not hide this warnings!

http://pecl.php.net/bugs/bug.php?id=16843 suggests use of apc.slam_defense = Off;
Actually this lead to inconsistensy in cache because of

It's actually a feature, which prevents you from inserting the same key
multiple times with-in the same second.

Also using an old version of APC your own choice so you just need to use this switch.

I guess we need to append readme about suggested APC version and this key settings.

I am trying the suggestion.

If it does not work, then I'll revert to apc 3.1.4 if I need to.

I will report back

Edit:

While I did not get the error, I did get the core dump that the slam protection was supposed to be a fix for.

I tried downgrading to apc-3.1.4. I read this issue was in 3.1.5 and 3.1.6. We'll see.

I was just about to do the same, I think you have to go all the way to 3.0.19. http://pecl.php.net/bugs/bug.php?id=16843