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From Erick Erickson <>
Subject Re: Debugging update request
Date Tue, 15 Oct 2013 18:21:08 GMT
What version of Solr? There's a known issue
with distributed deadlock (since fixed) where
under heavy load from multiple clients to
multiple Solr nodes, you can get into a situation where
it will stop accepting updates, but _will_ continue
to serve queries.

If this describes your situation, dump the stack (jstack works)
and look for the word "semaphore" in the stack traces. If
Solr is waiting on that, that's your problem.

SOLR-4816 (4.5) should alleviate this if you're indexing
from SolrJ, and SOLR-5216 should fix it on the server.


On Tue, Oct 15, 2013 at 10:54 AM, maephisto <> wrote:

> As a followup to another thread, where I described how my SolrCloud
> sometimes
> just stops accepting updates
> I have a question, is there a way to debug or analyze the update request?
> Verbose output or anything else?
> It happens for me that when in the above situation, I'm using the
> tool to post 1 doc and i get no feedback, it just hangs and waits.
> 10x!
> --
> View this message in context:
> Sent from the Solr - User mailing list archive at

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