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From Shawn Heisey <>
Subject Re: Solr thread problems
Date Fri, 02 Mar 2018 02:15:42 GMT
On 3/1/2018 4:31 AM, 苗海泉 wrote:
> My question is, what is the relationship between the number of threads 
> in the commitScheduler thread pool and what? The number of 
> searcherExecutor thread pool and the above have a relationship, why so 
> much, thank you!

I don't understand this question.  Can you try again?

Looking at the information you've provided ... are you doing a large 
number of simultaneous DeleteByQuery operations?That does seem like a 
lot of threads in a WAITING state.  I'm not sure what is going on, but 
if there are a lot of DeleteByQuery operations happening, it MIGHT cause 

In another discussion, you mentioned having more than one thousand 
collections.  This is going to result in Solr creating a large number of 
threads.  I'm actually surprised that you don't have far more than 1169 

Every experiment I've done with thousands of collections has turned out 
badly, often before I even reach 1000 of them. SolrCloud just does not 
like dealing with it.

Three years ago, I filed the following issue about it. Somebody marked 
it as fixed, though I have no idea why.  It doesn't appear to be fixed 
to me, and there were never any code changes related to the issue:

In that discussion about lots of collections, you asked this:

> Thank you for your advice on gc tools, what do you suggest to me?

I don't understand this question either.  I had just given you some 
advice about GC tools.  What are you asking?


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