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
Josh
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