Benoit Tellier created JAMES-3613:
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Summary: Avoid DNS resolution for protocol MDC context
Key: JAMES-3613
URL: https://issues.apache.org/jira/browse/JAMES-3613
Project: James Server
Issue Type: Improvement
Components: IMAPServer, POP3Server, SMTPServer
Affects Versions: 3.4.0, 3.5.0, 3.6.0
Reporter: Benoit Tellier
Fix For: 3.7.0
On gitter: {code:java}
Running into an odd issue after an application restart. (James 3.4.0 running in
SpringBoot application). Was working fine, but now seem to be getting hung, or
at least slow threads, on java.net.Inet6AddressImpl.getHostByAddr as called by
org.apache.james.protocols.netty.ProtocolMDCContext.retrieveHost(ProtocolMDCContext.java:55).
My environment is Java 11, on Amazon Linux 2, on EC2.
{code}
https://gist.github.com/devondragon/8ec7424a48dc843338443b0b98356289
this seems to have been caused by too many incoming SMTP connections. Showed up
in an odd way, but by decreasing the inbound connections this issue has stopped
happening...
Likely some rate limit on DNS resolution.
Proposal: switch from `getHostName` to `getHostString` to prevent the DNS
resolution.
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