php and values not returning from memcached

[Richard 'toast' Russo]

Scott,

Have you tried working with just one memcached server?  The stats you show
look good (total_items = cmd_set), but don't match the number of items you
put in the cache.

toast

On Wed, 2 Jun 2004 sjohnsonlist@feedster.com wrote:

> Hi all,
>
> Note: 1st post here so please excuse obvious stupidity but I did read
> through the api docs and server docs w/o seeing anything.
>
> I'm running memcached across 3 servers on gentoo linux, kernel 2.6.5
> environment (400 megs ram, 100 megs ram, 300 megs ram).
>
> What I'm doing is writing a cache loader to pre-populate a cache of data
> pulled from a mysql table.  And what I'm finding is that caching a large
> number of items is leaving a handful without values.
>
> My code is using the php API from this:
> http://www.danga.com/memcached/dist/php-memcached-1.0.10.tar.gz
>
> Basically all I do is loop over my database and call $memc->set($key,
> $value, $expire) and then kill the job if $memc returns false.  It never
> dies so memcache seems to be accepting all my objects fine.  That works
> fine and here's my internal diagnostics at the end of the job:
>
> Total size = 10795847 (this is the sum of the string lengths I loaded)
> 22734 total objects loaded (this is the total # of keys I sent to memcache)
>
> Now when I go to retrieve the content, I get this result:
>
> Key=|raw_content_47519384|
> err=No value found for key raw_content_47519384
>
> But I know this was set correctly or my code would have died (and my logs
> show it was set correctly).  My guess is that objects are being expired
> from the cache as new objects come in but I am setting a 5 day expiration
> time as measured by a time() + (5*86400) value. And this doesn't seem to
> be enough data to overflow a cache of this size.
>
> Here are my stats from the server:
> stats
> STAT pid 25901
> STAT uptime 503
> STAT time 1086201062
> STAT version 1.1.9
> STAT rusage_user 0:118981
> STAT rusage_system 0:190970
> STAT curr_items 4395
> STAT total_items 4395
> STAT bytes 2498844
> STAT curr_connections 1
> STAT total_connections 5094
> STAT connection_structures 4
> STAT cmd_get 697
> STAT cmd_set 4395
> STAT get_hits 498
> STAT get_misses 199
> STAT bytes_read 2454699
> STAT bytes_written 338016
> STAT limit_maxbytes 524288000
> END
> flush_all
> ERROR
>
> Interestingly I'm finding that the flush_all command isn't working.  That
> feeds very, very wrong.
>
> Comments ?  Thanks in advance.
>
> Scott
>
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