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From Erick Erickson <>
Subject Re: Solr nodes crashing (OOM) after 6.6 upgrade
Date Mon, 18 Sep 2017 15:35:28 GMT
<filterCache class="solr.FastLRUCache" size="20000" initialSize="4096"

This is suspicious too. Each entry is up to about
maxDoc/8 bytes + (string size of fq clause) long
and you can have up to 20,000 of them. An autowarm count of 512 is
almost never  a good thing.

Walter's comments about your memory are spot on of course, see:


On Mon, Sep 18, 2017 at 7:59 AM, Walter Underwood <> wrote:
> 29G on a 30G machine is still a bad config. That leaves no space for the OS, file buffers,
or any other processes.
> Try with 8G.
> Also, give us some information about the number of docs, size of the indexes, and the
kinds of search features you are using.
> wunder
> Walter Underwood
>  (my blog)
>> On Sep 18, 2017, at 7:55 AM, shamik <> wrote:
>> Apologies, 290gb was a typo on my end, it should read 29gb instead. I started
>> with my 5.5 configurations of limiting the RAM to 15gb. But it started going
>> down once it reached the 15gb ceiling. I tried bumping it up to 29gb since
>> memory seemed to stabilize at 22gb after running for few hours, of course,
>> it didn't help eventually. I did try the G1 collector. Though garbage
>> collection was happening more efficiently compared to CMS, it brought the
>> nodes down after a while.
>> The part I'm trying to understand is whether the memory footprint is higher
>> for 6.6 and whether I need an instance with higher ram (>30gb in my case). I
>> haven't added any post 5.5 feature to rule out the possibility of a memory
>> leak.
>> --
>> Sent from:

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