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From Rallavagu <rallav...@gmail.com>
Subject Re: Solr 4.6.1 Cloud Stops Replication
Date Tue, 18 Aug 2015 14:18:20 GMT
Thanks for the response. Does this cache behavior influence the delay in 
catching up with cloud? How can we explain solr cloud replication and 
what are the option to monitor and take proactive action (such as 
initializing, pausing etc) if needed?


On 8/18/15 5:57 AM, Shawn Heisey wrote:
> On 8/17/2015 10:53 PM, Rallavagu wrote:
>> Also, I have noticed that the memory consumption goes very high. For
>> instance, each node is configured with 48G memory while java heap is
>> configured with 12G. The available physical memory is consumed almost
>> 46G and the heap size is well within the limits (at this time it is at
>> 8G). Is there a documentation or to understand this behavior? I suspect
>> it could be lucene related memory consumption but not sure.
>
> This is completely normal.  Your total memory usage could have been
> 47.9GB instead of 46GB and I would still say the same thing.
>
> Solr cannot consume more than the 12GB heap that you have assigned, plus
> a little overhead (probably a few hundred MB) for the JVM itself.  The
> rest of your memory (assuming Solr is the only significant software
> installed on the system) is used by the operating system for caching
> contents on your disk.  Solr *relies* on this behavior (and the
> available RAM it requires) for good performance.
>
> https://en.wikipedia.org/wiki/Page_cache
> https://wiki.apache.org/solr/SolrPerformanceProblems
>
> Thanks,
> Shawn
>

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