Re : EventDeadLettersHealthChe ck : EventDeadLetters contain ev ents. This might indicate trans ient failure on event processing.

Hi wojtek,

This is a symptoms of mails not being correctly indexed in Lucene.

I recommend tracking and fixing the bugs in Lucene indexing. Could you please open JIRAs for those?

Once the indexing is patched, re- indexing would succeed.

Alternatively, event dead letter can be purged via webadmin.

--


Best regards,



Benoit TELLIER



General manager of Linagora VIETNAM.

Product owner for Team-Mail product.

Chairman of the Apache James project.



Mail: [email protected]

Tel: (0033) 6 77 26 04 58 (WhatsApp, Signal)

Le juin 27, 2023 12:35 AM, de Wojtek Hi,
I noticed logs being filled with

```
06:20:29.372 [WARN ] o.a.j.PeriodicalHealthChecks - DEGRADED: EventDeadLettersHealthCheck : 
EventDeadLetters contain events. This might indicate transient failure on event processing.
```

Is it something to be worried about?

There are a bunch of exceptions/errors (mostly regarding Date in headers, some handled and being 
logged as debug, some not logged as errors) - is the above line a result of those errors? For example:

```
08:57:28.150 [ERROR] o.a.j.e.d.EventDelivery$Retryer$BackoffRetryer - listener 
org.apache.james.mailbox.lucene.search.LuceneMessageSearchIndex exceeded maximum retry(8) to handle 
event org.apache.james.mailbox.events.MailboxEvents.Added
```

I assume above would result in the event being appended to the collection in EventDeadLetters (one 
of the implementations) and healthcheck just checks it, but shouldn't those be cleared at one point?

Btw. If I encounter error/exception while processing a message
-- 
Wojtek

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