We have two public instances, that are clustered and are using NFS shared 
repository directory (/repositories/magnolia/repository/)
The cluster ID is specified in magnolia.properties file for both public 
instances. We used 
samuelschmitt.net/2013/09/step-by-step-magnolia-cms-clustering/ guide to 
achieve clustering.
Everything seems to be working fine apart from images. 


We keep on getting below error messages each time a call is made to retrieve an 
image. 

[code]
2016-07-28 12:49:01,704 ERROR info.magnolia.module.cache.filter.CacheFilter     
: A request started to cache but failed with an exception (ImagingException: 
Can't load image from 
/places/KFYIR5SWED5a/KFYIR5SWED5a_0_537x720.jpg/jcr:content). 
[url=http://uatloadbalancer-1471990206.ap-southeast-1.elb.amazonaws.com:8080/uatPublic/.imaging/hero_x3/dam/places/KFYIR5SWED5a/KFYIR5SWED5a_0_537x720.jpg]
2016-07-28 12:49:01,704 ERROR info.magnolia.module.cache.filter.CacheFilter     
: A request started to cache but failed with an exception (ImagingException: 
Can't load image from 
/places/OPPIR5TY9POs/OPPIR5TY9POs_0_1440x1920.jpg/jcr:content). 
[url=http://uatloadbalancer-1471990206.ap-southeast-1.elb.amazonaws.com:8080/uatPublic/.imaging/hero_x3/dam/places/OPPIR5TY9POs/OPPIR5TY9POs_0_1440x1920.jpg]
2016-07-28 12:49:01,704 ERROR info.magnolia.module.cache.filter.CacheFilter     
: A request started to cache but failed with an exception (ImagingException: 
Can't load image from 
/places/TRSYIR5S0KGXm/TRSYIR5S0KGXm_0_720x540.jpg/jcr:content). 
[url=http://uatloadbalancer-1471990206.ap-southeast-1.elb.amazonaws.com:8080/uatPublic/.imaging/hero_x3/dam/places/TRSYIR5S0KGXm/TRSYIR5S0KGXm_0_720x540.jpg]
[/code]

Whats interesting, is that we get this only on one of the instances 
(magnoliaPublic 2). Public 2 is NFS mounted onto public 1. 
Another point to add, we noticed this error message is thrown only once for one 
image. When you attempt to load this image again, it tends to work, however 
this behaviour is intermittent.

Please also note that we are using load balancer to route the traffic to public 
1 or public 2. 

Any advice will be appreciated.

-- 
Context is everything: 
http://forum.magnolia-cms.com/forum/thread.html?threadId=c9a18b1f-e47a-4d11-9c15-448c5e14a519


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