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From Steph van Schalkwyk <svanschalk...@gmail.com>
Subject Re: Ensemble fails when one node looses connectivity
Date Fri, 02 Mar 2018 16:32:47 GMT
If this is a t2.micro on AWS, then it has 1GB of RAM.

On Fri, Mar 2, 2018 at 9:47 AM, Shawn Heisey <elyograg@elyograg.org> wrote:

> On 3/2/2018 6:54 AM, Jim Keeney wrote:
>> Thanks for jumping in on the ZK side as well.
>> I will take a hard look at my config files but I checked and I do not have
>> any one file over 1MB. The combined files (10 indexes) is 2.2MB.
>> I am using micros for the nodes which are very limited in memory.
>> I'm not currently using a java.env file so I guess I'm using the default
>> values for the JVM which is typically xmx512M if I remember correctly.
>> Could it be just a memory issue?
> Usually Java on Linux has a default heap size of about 4GB.  But it would
> be highly dependent on the amount of memory actually present on the
> machine.  Just yesterday, I saw Java report a 6GB default heap size, on a
> machine with 24GB of memory. Information I can find about AWS instance
> types says that a micro instance has 1GB of memory.  So the default heap
> size is probably quite small.
> Even in small server situations, I would strongly recommend that anytime
> you have a java commandline, you define -Xmx for the max heap, and -Xms
> should probably be set as well, to the same value as -Xmx.  That way you're
> not relying on defaults, you're absolutely sure what the heap size is.
> For ZK servers handling 2 megabytes of config data plus the rest of a
> small SolrCloud install, something like 256MB or 512MB of heap would
> probably be plenty.  ZK holds a copy of its entire database in memory.
> Small SolrCloud installs won't put much of a load on ZK.  A micro instance
> should be plenty for ZK when the software using it is Solr, as long as
> that's the only thing it's running.
> Thanks,
> Shawn

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