Warning: "Restored ImapFolder has null folderIdentifier"

[msquadrat]

Hi folks,

I just upgraded our 8.7.11 to 8.8.11 and it was mostly smooth sailing. After the updates I noticed a lot of warnings like these though for most of (all?) active IMAP users:

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2018-12-27 15:43:37,886 INFO  [ImapServer-1] [ip=144.76.182.110;cid=99;oip=84.46.72.100;via=188.40.16.196(nginx/1.7.1);ua=Zimbra/8.8.11_GA_3737;] imap - ID elapsed=1
2018-12-27 15:43:37,886 INFO  [ImapServer-4] [ip=144.76.182.110;oip=84.46.72.100;via=188.40.16.196(nginx/1.7.1);ua=Zimbra/8.8.11_GA_3737;cid=99;] imap - AUTHENTICATE elapsed=0
2018-12-27 15:43:37,886 INFO  [ImapServer-3] [name=user@example.com;ip=144.76.182.110;oip=84.46.72.100;via=188.40.16.196(nginx/1.7.1);ua=Zimbra/8.8.11_GA_3737;cid=99;] imap - user user@example.com authenticated, mechanism=PLAIN
2018-12-27 15:43:37,886 INFO  [ImapServer-3] [name=user@example.com;ip=144.76.182.110;oip=84.46.72.100;via=188.40.16.196(nginx/1.7.1);ua=Zimbra/8.8.11_GA_3737;cid=99;] imap - AUTHENTICATE elapsed=0
2018-12-27 15:43:37,899 WARN  [ImapServer-0] [name=user@example.com;ip=144.76.182.110;oip=84.46.72.100;via=188.40.16.196(nginx/1.7.1);ua=Zimbra/8.8.11_GA_3737;cid=99;] imap - Restored ImapFolder has null folderIdentifier mailbox=Mailbox{id=321, account=2a935615-0853-4435-ba14-c007fdbaf600, lastItemId=1159, size=130305742} sessionPath=INBOX
2018-12-27 15:43:37,899 INFO  [ImapServer-0] [name=user@example.com;ip=144.76.182.110;oip=84.46.72.100;via=188.40.16.196(nginx/1.7.1);ua=Zimbra/8.8.11_GA_3737;cid=99;] imap - selected folder INBOX
2018-12-27 15:43:37,899 INFO  [ImapServer-0] [name=user@example.com;ip=144.76.182.110;oip=84.46.72.100;via=188.40.16.196(nginx/1.7.1);ua=Zimbra/8.8.11_GA_3737;cid=99;] imap - SELECT elapsed=1
…
2018-12-27 15:43:37,937 INFO  [ImapServer-4] [name=user@example.com;ip=144.76.182.110;oip=84.46.72.100;via=188.40.16.196(nginx/1.7.1);ua=Zimbra/8.8.11_GA_3737;cid=99;] imap - NOOP elapsed=0
2018-12-27 15:43:37,949 INFO  [ImapServer-3] [name=user@example.com;ip=144.76.182.110;oip=84.46.72.100;via=188.40.16.196(nginx/1.7.1);ua=Zimbra/8.8.11_GA_3737;cid=99;] imap - LOGOUT elapsed=0
2018-12-27 15:43:37,949 INFO  [ImapServer-0] [name=user@example.com;ip=144.76.182.110;oip=84.46.72.100;via=188.40.16.196(nginx/1.7.1);ua=Zimbra/8.8.11_GA_3737;cid=99;] imap - dropping connection for user user@example.com (LOGOUT)

Has anybody else seen these warnings as well?

My feeling is that they aren't bad things and are related to the IMAP session cache but lots of warnings in the log file makes me a bit uneasy.

[L. Mark Stone]

Malte,

Not seeing that on any of our systems, but at one point Zimbra Support asked us, in response to other seemingly benign errors in mailbox.log, to run:

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zmprov ms `zmhostname` zimbraImapInactiveSessionEhcacheSize 104857600

to increase the cache size (the default is quite small).

As I don't fully understand how the ehcache is used, not sure if this is related or not, but thought I would pass it on.

Mark