Client.php on line 1104

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February 15, 2017 9:12 PM

Alfa1

Distinguished Member

read error on connection in /library/Redis/lib/Credis/Client.php on line 1104

I have thousands of these:

Code:

CredisException: read error on connection - library/Redis/lib/Credis/Client.php:1104 
Generated By: Unknown Account, A moment ago
Stack Trace
#0 /library/Redis/Cm/Cache/Backend/Redis.php(376): Credis_Client->__call('hget', Array)
#1 /library/Zend/Cache/Core.php(329): Cm_Cache_Backend_Redis->test('xf_data_vw_atta...')
#2 /vault/core/model/datastore/xf.php(29): Zend_Cache_Core->test('xf_data_vw_atta...')
#3 /vault/core/model/datastore/xf.php(108): vw_Datastore_Model_XF->_isset('vw_attach_usage')
#4 /library/vw/XenForo/CodeEventListener.php(59): vw_Datastore_Model_XF->db_fetch(Array)
#5 /library/XenForo/CodeEvent.php(90): vw_XenForo_CodeEventListener::init_dependencies(Object(XenForo_Dependencies_Public), Array)
#6 /library/XenForo/Dependencies/Abstract.php(215): XenForo_CodeEvent::fire('init_dependenci...', Array)
#7 /library/XenForo/CssOutput.php(594): XenForo_Dependencies_Abstract->preLoadData()
#8 /css.php(12): XenForo_CssOutput::run()
#9 {main}
Request State
array(3) {
  ["url"] => string(84) "https://forum.com/css.php?css=xenforo,form,public&style=2&dir=LTR&d=1487206330"
  ["_GET"] => array(4) {
    ["css"] => string(19) "xenforo,form,public"
    ["style"] => string(1) "2"
    ["dir"] => string(3) "LTR"
    ["d"] => string(10) "1487206330"
  }
  ["_POST"] => array(0) {
  }
}

Issue Details

Issue Number 4915

Issue Type Bug

Project VaultWiki 4.x Series

Category General

Status Not a Bug

Priority 2 - Fatal / Database Errors

Affected Version 4.0.16

Fixed Version (none)

Milestone (none)

Software DependencyXenForo 1.x

License TypePaid

Users able to reproduce bug 0

Users unable to reproduce bug 0

Attachments 0

Assigned Users (none)

Tags (none)

February 16, 2017 8:59 AM

pegasus

VaultWiki Team

It seems like there is an issue with the Redis configuration or the Redis instance if Zend Cache cannot read from it. VaultWiki doesn't do anything special here. It doesn't communicate directly with Redis. VaultWiki is asking XenForo's cache object, which happens to be a Zend Cache, "Hey, do you have a key 'vw_attach_usage' in your storage?" Zend Cache passes this question along to Redis.

Maybe your Redis instance crashed while you were away?

Reply
February 19, 2017 10:02 AM

pegasus

VaultWiki Team

Per your other thread, indeed your Redis instance crashed. This was a post-crash error message that occurred because XenForo tried to read from Redis after Redis was already gone. In the case of this specific error message at least, it is a coincidence that the cache entry being requested has a key name that starts with 'vw_'; that just happened to be the next value requested after the crash.

Your Redis logs will be more useful to you here, and since a crash was involved, you will probably need to talk to Redis developers and provide them with a backtrace from the crash. Then they will be able to give you more information about what caused it, and they will also be able to patch Redis so that it doesn't crash in that situation again.

Reply
February 24, 2017 11:47 AM

Alfa1

Distinguished Member

I have fixed this by upgrading redis and changing the redis settings.

Reply
July 22, 2017 9:07 AM

Alfa1

Distinguished Member

Unfortunately, this was not fixed with the upgrade. It is indeed not a vaultwiki bug. However, xenforo 2 will have redis built in, so it may be a good idea for VW to anticipate on that.

Reply

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Issue: read error on connection in /library/Redis/lib/Credis/Client.php on line 1104

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