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https://issues.apache.org/jira/browse/SOLR-9290?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15381414#comment-15381414
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Shawn Heisey commented on SOLR-9290:
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I recently joined the jetty-users mailing list for other Solr-related issues.
Ten days ago (July 7th in my timezone) somebody sent a message to that list
about encountering a large number of CLOSE_WAIT connections when using SSL.
{quote}
We have an ensemble of three jetty-servers running jetty 9.3.8 on CentOS. There
is a fairly high rate of communication between the servers. When we run the
ensemble without SSL, everything works perfectly, but once SSL is activated,
exactly one of the servers start to get a massive amount of connections in
CLOSE_WAIT (more than 50 000). This, again, causes the Old Gen-part of the heap
memory in the JVM to fill up, and the server becomes unable to communicate with
exactly one of the other two, with Couldn’t resolve address. However, the other
machine can still communicate with the one that breaks down, and the 3^rd
machine can communicate with both.
It seems that other people using Jetty (not just Solr) are experiencing a
buildup of CLOSE_WAIT connections when using SSL.
{quote}
I'm going to mention this issue on the mailing list thread, and try to find out
whether they are having the problem with software *other* than Solr.
> TCP-connections in CLOSE_WAIT spike during heavy indexing and do not decrease
> -----------------------------------------------------------------------------
>
> Key: SOLR-9290
> URL: https://issues.apache.org/jira/browse/SOLR-9290
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Affects Versions: 5.3.2, 5.4.1, 5.5.1, 5.5.2, 6.0, 6.0.1, 6.1
> Reporter: Anshum Gupta
> Assignee: Shalin Shekhar Mangar
> Priority: Critical
> Fix For: 6.2, 5.5.3
>
> Attachments: SOLR-9290-debug.patch, SOLR-9290-debug.patch,
> SOLR-9290.patch, SOLR-9290.patch, SOLR-9290.patch, index.sh, setup-solr.sh,
> setup-solr.sh
>
>
> Heavy indexing on Solr with SSL leads to a lot of connections in CLOSE_WAIT
> state.
> At my workplace, we have seen this issue only with 5.5.1 and could not
> reproduce it with 5.4.1 but from my conversation with Shalin, he knows of
> users with 5.3.1 running into this issue too.
> Here's an excerpt from the email [~shaie] sent to the mailing list (about
> what we see:
> {quote}
> 1) It consistently reproduces on 5.5.1, but *does not* reproduce on 5.4.1
> 2) It does not reproduce when SSL is disabled
> 3) Restarting the Solr process (sometimes both need to be restarted), the
> count drops to 0, but if indexing continues, they climb up again
> When it does happen, Solr seems stuck. The leader cannot talk to the
> replica, or vice versa, the replica is usually put in DOWN state and
> there's no way to fix it besides restarting the JVM.
> {quote}
> Here's the mail thread:
> http://mail-archives.apache.org/mod_mbox/lucene-solr-user/201607.mbox/%[email protected]%3E
> Creating this issue so we could track this and have more people comment on
> what they see.
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