[Bug 9915] New: File stopped synchronizing during transmission

[Justin T Pryzby]

On Wed, May 29, 2013 at 04:39:55AM +0000, samba-bugs at samba.org wrote:
> https://bugzilla.samba.org/show_bug.cgi?id=9915
> We have currently trying to transmit data from one server to another using
> RYSNC by synchronizing 2 folders. Occasionally, we noticed that the file stop
> when in the middle of transmission (we can see tmp file created on the
> receiving end) even through the file has completely written to the the folder
> on the sending side. After a long while (7-30 minutes), it will complete
> sending.
>
> We are not sure if the following is true, but if we start sending a
> file to the same folder the such issue happen, the "hung" file will resume
> sending and complete immediately. The message file that we sent are usually in
> the sizes between 1MB-4MB. For the time being, we are sending small-sized file
> of 1byte to "trigger" and "hung" transmission. Below is the arguments that we
> are using

Are you sure it's not a network issue?  Have you tried swapping
cables?  Are there any interface errors on either end?  ifconfig will
show that, and you might also check linux sysstat.

It sounds like tcp packet loss.  Are you able to strace both rsync
processes when this happens?

Justin