Benoit Tellier created JAMES-3105:
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Summary: Corrective task for mailbox counters
Key: JAMES-3105
URL: https://issues.apache.org/jira/browse/JAMES-3105
Project: James Server
Issue Type: New Feature
Components: cassandra, mailbox
Reporter: Benoit Tellier
Cassandra maintains a per mailbox projection for message count and unseen
message count.
As with any projection, it can go out of sync, leading to inconsistent results
being returned to the client, which is not acceptable.
We need to expose a corrective task, resetting mailbox counters to their
correct value.
The proposed endpoint is:
{code:java}
curl -XPST http://ip:port/mailbox?task=RecomputeMailboxCounters
{code}
This endpoints will:
- List existing mailboxes
- List their messages
- Check them against their source of truth
- Compute mailbox counter values
- And reset the value of the counter if needed
Of course, this endpoint won't be friendly in the face of concurrent
operations, which would be ignored during the recomputation of the counter of
the given mailbox. However the source of truth is unaffected hence, upon
rerunning the task, the result will be eventually correct.
To be noted that we rely on the "listing messages by mailbox" projection (that
we recheck). Missing entries in there will be ignored until the given
projection is healed (currently unsupported). We furthermore can piggy back a
partial check of the message denormalization upon counter recomputation
(partial because we cannot detect missing entries in the "list messages in
mailbox" denormalization table)
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