Random add/set errors on Debian/Memcached 1.1.12

[Brian Moon]

Mauro, what version of the memcached client do you have?  The client was 
never provided with PHP, so it had to be installed on it's own.  I would 
guess from a Debian package.  It is something you want to be up on.

Can you provide reproduce code?  Are you caching objects?  arrays? 
strings?  We cache our front page HTML all day long.  It sits at 100k+ 
at all times.  And we NEVER see errors.  Like, never ever.

> Mauro Maggi wrote:
>> We got some random errors with Memcached 1.1.12 on a (32-bit) production
>> server running Debian 4.0r1. The client API is the one provided with php
>> 4.4.4
>>
>> memcache_set() and memcache_add() randomly fail when trying to set large
>> values ( > 30kb); the larger the entry length, the larger the number of
>> failures. Moreover, we get random notices like this one: "Notice: 
>> memcache_get_stats() [function.memcache-get-stats]: Server
>> 192.168.0.13 (tcp 11211) failed with: Failed reading line from stream
>> (0) in /path/to/script.php"
>>
>> The same setup on a local developing box, with the same setup, gives us
>> no failures and everything works ok.
>>
>> What's wrong in our production box? Is there a way to get an insight on
>> why the functions are failing, other than their "false" return value?
>>
>> What follows is the phpinfo() memcached reported configuration and the 
>> output of the memcache_get_advanced_server_stats on our production box:
>>
>> Revision     $Revision: 1.92 $
>> memcache.allow_failover    1
>> memcache.chunk_size    8192
>> memcache.default_port    11211
>> memcache.hash_function    crc32
>> memcache.hash_strategy    standard
>> memcache.max_failover_attempts    20
>>
>> ----
>>
>> Server stats:array(19) {
>>   ["pid"]=>
>>   string(4) "2735"
>>   ["uptime"]=>
>>   string(6) "355498"
>>   ["time"]=>
>>   string(10) "1196778820"
>>   ["version"]=>
>>   string(6) "1.1.12"
>>   ["rusage_user"]=>
>>   string(10) "230.270391"
>>   ["rusage_system"]=>
>>   string(10) "452.140257"
>>   ["curr_items"]=>
>>   string(7) "1012241"
>>   ["total_items"]=>
>>   string(8) "10852467"
>>   ["bytes"]=>
>>   string(10) "1429072369"
>>   ["curr_connections"]=>
>>   string(3) "469"
>>   ["total_connections"]=>
>>   string(7) "6798948"
>>   ["connection_structures"]=>
>>   string(3) "654"
>>   ["cmd_get"]=>
>>   string(8) "10898327"
>>   ["cmd_set"]=>
>>   string(8) "10852467"
>>   ["get_hits"]=>
>>   string(7) "8061893"
>>   ["get_misses"]=>
>>   string(7) "2836434"
>>   ["bytes_read"]=>
>>   string(11) "18236447981"
>>   ["bytes_written"]=>
>>   string(11) "14350735133"
>>   ["limit_maxbytes"]=>
>>   string(10) "2147483648"
>> }
>>
>>
>>
> 


-- 

Brian Moon
Senior Developer
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