https://bugzilla.samba.org/show_bug.cgi?id=5795





------- Comment #1 from Dave@Yost.com 2008-09-27 18:23 CST -------
It turns out there was clearly not enough space on the destination. The copy
was going to take 20GB, and after the crash there was still 1GB on the
destination, so I thought this was probably a protocol bug rather than a
problem with running out of space.

Perhaps what this is is a situation where the remote end should have sent back
an indication that it was out of space and should have shut down gracefully.

But there is another problem here: the two ends should start out by negotating
whether there is enough space for the copy. In a better world, the destination
OS would give the rsync process the ability to atomically grab disk resources
up front to be used for the files and folders it creates, and if that fails,
the remote rsync would tell the UI rsync no dice. Or how about this: writing
the destination files could be transaction in the OS file system! Nah.


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https://bugzilla.samba.org/show_bug.cgi?id=5795


wayned@samba.org changed:

What |Removed |Added
----------------------------------------------------------------------------
Severity|blocker |enhancement
Status|NEW |ASSIGNED
Summary|error in rsync protocol data|look into a improved tear-
|stream (code 12) at |down processing during fatal
|io.c(632) [sender=3.0.4] |errors




------- Comment #2 from wayned@samba.org 2008-10-02 13:53 CST -------
Yes, the error reporting coming back from some errors can indeed be lacking.
However, the pipe-lined nature of the protocol can make this hard to overcome
(the error can be behind so much checksum data that it can't make it back prior
to the connection getting torn down). In 3.1.0, I have a new option,
--msgs2stderr, that can often be used to debug such situations (for non-daemon
transfers).

It would be good to investigate a reliable way to drain (and discard) the
pending data to get all the relevant messages more reliably. For instance, if a
new message was added "fatal exit in progress", it could be sent and circle the
3 processes before the connection is torn down. e.g. a write error on the
receiver sends the error message (text) to the generator, sends the fatal
message too, and then just discards file-change data until it gets the fatal
message back from the sender.


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https://bugzilla.samba.org/show_bug.cgi?id=5795





------- Comment #3 from Dave@Yost.com 2008-10-02 15:47 CST -------
Why not have the process generating the error delay exit until it gets an ack
of the error message? A separate connection would be best so the pipelined data
doesn't get in the way.


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https://bugzilla.samba.org/show_bug.cgi?id=5795





------- Comment #4 from wayned@samba.org 2008-10-03 00:35 CST -------
That's what I just said.


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