sync_client failing with "Fatal error: failed to finish reading file!"

[Nic Bernstein]

Friends,
We've been running a pair of replicas with Ken's
cyrus-imapd-2.4.17-caldav-beta (4 and 5) recently, in preparation for a
migration away from a single 2.4.11 server.  The configuration is the
2.4.11 box is the master, it replicates to the first 2.4.17 box, which
is also running a sync_client instance to replicate to the second 2.4.17
box.  The intent is that once the client is ready, we abandon the 2.4.11
box and the first 2.4.17 instance becomes the master and the second the
replica.

This has all been running pretty well, but lately the sync_client on the
middle box has failed a few times.  Each time, I see this in the logs
(The 2.4.11 master server has nothing in this time interval):

    # The 2.4.17 replica -- in the middle:
    Jun 11 13:36:09 mailbox cyrus/sync_client[29338]: sync_client RESTART succeeded
    Jun 11 13:36:10 mailbox cyrus/sync_client[29338]: COMPRESS received NO response: Compression already active: DEFLATE
    Jun 11 13:36:10 mailbox cyrus/sync_client[29338]: Failed to enable compression, continuing uncompressed
    Jun 11 13:36:52 mailbox cyrus/sync_client[29338]: Fatal error: failed to finish reading file!

    # The 2.4.17 replica, end of the chain:
    Jun 11 13:36:16 ia24 cyrus/syncserver[21234]: accepted connection
    Jun 11 13:36:16 ia24 cyrus/syncserver[21234]: cmdloop(): startup
    Jun 11 13:36:16 ia24 cyrus/syncserver[21234]: login: mailbox.wi.occinc.com [192.168.190.24] mailproxy PLAIN User logged in
    Jun 11 13:36:59 ia24 cyrus/syncserver[21234]: IOERROR: reading message: unexpected end of file

Can anyone tell me what this is indicative of?  A search of the web
doesn't turn up any hits for "Fatal error: failed to finish reading file!"

Thanks in advance!
    -nic

-- 
Nic Bernstein                             nic at onlight.com
Onlight, Inc.                             www.onlight.com
219 N. Milwaukee St., Suite 2a            v. 414.272.4477
Milwaukee, Wisconsin  53202

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