Hi Josh,
On Mon, Dec 7, 2015 at 6:50 PM, Josh Durgin <jdurgin@xxxxxxxxxx> wrote:
On 12/07/2015 03:29 PM, Alex Gorbachev wrote:
When trying to merge two results of rbd export-diff, the following error
occurs:
iss@lab2-b1:~$ rbd export-diff --from-snap autosnap120720151500
spin1/scrun1@autosnap120720151502 /data/volume1/scrun1-120720151502.bck
iss@lab2-b1:~$ rbd export-diff --from-snap autosnap120720151504
spin1/scrun1@autosnap120720151504 /data/volume1/scrun1-120720151504.bck
iss@lab2-b1:~$ rbd merge-diff /data/volume1/scrun1-120720151502.bck
/data/volume1/scrun1-120720151504.bck /data/volume1/mrg-scrun1-0204.bck
Merging image diff: 11% complete...failed.
rbd: merge-diff error
That's all the output and I have found this link
http://tracker.ceph.com/issues/12911 but not sure if the patch should
have already been in hammer or how to get it?
That patch fixed a bug that was only present after hammer, due to
parallelizing export-diff. You're likely seeing a different (possibly
new) issue.
Unfortunately there's not much output we can enable for export-diff in
hammer. Could you try running the command via gdb to figure out where
and why it's failing? Make sure you have librbd-dbg installed, then
send the output from gdb doing:
gdb --args rbd merge-diff /data/volume1/scrun1-120720151502.bck \
/data/volume1/scrun1-120720151504.bck /data/volume1/mrg-scrun1-0204.bck
break rbd.cc:1931
break rbd.cc:1935
break rbd.cc:1967
break rbd.cc:1985
break rbd.cc:1999
break rbd.cc:2008
break rbd.cc:2021
break rbd.cc:2053
break rbd.cc:2098
run
# (it will run now, stopping when it hits the error)
info locals
Will do - how does one load librbd-dbg? I have the following on the system:
librbd-dev - RADOS block device client library (development files)
librbd1-dbg - debugging symbols for librbd1
is librbd1-dbg sufficient?
Also a question - the merge-diff really stitches the to diff files together, not really merges, correct? For example, in the following workflow:
export-diff from full image - 10GB
export-diff from snap1 - 2 GB
export-diff from snap2 - 1 GB
My resulting merge export file would be 13GB, correct?
Thank you,
Alex
Josh
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