sync_client problems

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Hi list, I'm running cyrus replication on cyrus 2.5.10. It seems whenever a folder is encountered in log-run that doesn't exist on the client and/or the server, the replication process logs "Error in do_sync(): bailing out! Bad protocol". Sometimes, it dies completely, other times it restarts at the beginning of the log-run file. But when it re-encounters the folder in question, the same failure occurs and the problem continuously loops until some manual action is taken. I have a checker script that attempts to restart a stopped sync but I haven't tried to code it to get past these types of folder errors. In the meantime, replication effectively stops and the replication log continuously builds in size. You might imagine my horror at discovering yesterday that replication of my production server with 1200 accounts had been failing for over 7 weeks unnoticed, generating 9.5 million lines in the replication log files. I had gotten out of the habit of daily monitoring of replication as it had been running fine and I eventually moved on to other things. I'm trying to get replication to run through the enormous backlog but am running into more similar folder issues that cause the process to fail, I make manual fixes, and start the process again. In my experience with this, reconstruction of the affected folders on the master host and copy host has no effect.

Can this otherwise excellent feature be made more robust to work past these folder issues?

Here are a couple of examples I've observed thus far of how the process is failing for me.

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In this example, the subfolder "Fly America Foreign Travel" no longer existed on the master host but did exist on the copy host. To resolve this, I had to manually delete that folder from the copy host.

May 9 15:17:48 imap1 sync_client[34614]: inefficient replication (8 > 5) user.jtaft.PO.Fly America Foreign Travel May 9 15:17:48 imap1 sync_client[34614]: FULLMAILBOX received NO response: IMAP_MAILBOX_NONEXISTENT No Such Mailbox May 9 15:17:48 imap1 sync_client[34614]: do_folders(): update failed: user.jtaft.PO.Fly America Foreign Travel 'Mailbox does not exist'
May  9 15:17:48 imap1 sync_client[34614]: IOERROR: Mailbox does not exist
May 9 15:17:48 imap1 sync_client[34614]: Error in do_sync(): bailing out! Mailbox does not exist May 9 15:17:48 imap1 sync_client[34614]: Processing sync log file /var/spool/CyrusDB-Sieve/cyrusdb/sync/log-run failed: Mailbox does not exist May 9 15:17:48 imap1 sync_client[34614]: Reprocessing sync log file /var/spool/CyrusDB-Sieve/cyrusdb/sync/log-run

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In this example, the subfolder "Sohn" did not exist on the master host nor on the copy host. To resolve, I had to edit log-run and completely remove all entries for this "Sohn" subfolder.

May 10 10:13:26 imap1 sync_client[47011]: IOERROR: zero length response to MAILBOXES (end of file reached) May 10 10:13:26 imap1 sync_client[47011]: IOERROR: zero length response to MAILBOXES (end of file reached) May 10 10:13:26 imap1 sync_client[47011]: IOERROR: zero length response to UNMAILBOX (end of file reached) May 10 10:13:26 imap1 sync_client[47011]: folder_delete(): failed: user.gg-chair.Trash.Sohn 'Bad protocol' May 10 10:13:26 imap1 sync_client[47011]: Error in do_sync(): bailing out! Bad protocol May 10 10:13:26 imap1 sync_client[47011]: Processing sync log file /var/spool/CyrusDB-Sieve/cyrusdb/sync/log-run failed: Bad protocol

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Often, errors are logged without "bailing out!" and replication continues to run:

May 10 10:45:00 imap1 sync_client[87438]: sync_mailboxes: doing 1000
May 10 10:45:01 imap1 sync_client[87438]: sync_mailboxes: doing 1000
May 10 10:45:24 imap1 sync_client[87438]: IOERROR: GUID mismatch /var/spool/cyrus/mail/c/user/cdm-lit/Sent/148. May 10 10:45:37 imap1 sync_client[87438]: IOERROR: zero length response to MAILBOX (end of file reached) May 10 10:45:37 imap1 sync_client[87438]: do_folders(): update failed: user.cdm-lit.Sent 'Bad protocol'
May 10 10:45:37 imap1 sync_client[87438]: sync_mailboxes: doing 1000

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Thank you, list!

-Eric

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