Hi Josh, On Mon, Dec 7, 2015 at 6:50 PM, Josh Durgin <jdur...@redhat.com> 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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