Export fails on v1.0.6

[cyphercider]

If you suspect this could be a bug, follow the template.

• What version of Dgraph are you using?
  1.0.6

• What is the hardware spec (RAM, OS)?
  4 cores, 16GB AWS Ubuntu, docker
  Single instance

• Steps to reproduce the issue (command/config used to run Dgraph).
  curl localhost:8080/admin/export
  NOTE I noticed curl was removed from the docker image in v1.0.6, so it has to be installed before it can be run. It would be convenient if curl was re-added to the image.

• Expected behaviour and actual result.
  Expect a successful export. Instead export fails:
  

Neither server nor zero appear to log the error message...these are the only logs I see during the timeframe of the export:

Server logs:

Zero logs:

Note I tried restarting the server and trying the export again...same failed result.

We have reverted all application instances to v1.0.5 and restored from backup. We have made some application schema changes (minor) recently, but those shouldn't cause a failure. Note however that the predicate in the server logs, "HasInboundRelInstr" was in fact one of those changes. So maybe the failed export is related to modifying schema in v1.0.6, then attempting to export.

[manishrjain]

I don't see any specific error logs in the Server or Zero. Can you paste all of them? Or, send them to me?

Did you try doing the export again? Many things can cause an export to fail. If it's a temporary issue, a retry should fix it.

[cyphercider]

@manishrjain , Agreed, there actually were no messages other than the one returned by the CURL request, but the messages I pasted are the only ones that were printed around the time of the failed export. This error happened on both of our instances that we had upgraded to v1.0.6, so out of caution, I reverted those back to v1.0.5, even though it's possible the problem is unrelated to v1.0.6. That said, once v1.0.7 is out, I'll try the upgrade process again. If another failure happens, I'll see if I can't provide some more useful diagnostic info. I'll close for now just so as to not clutter up the open issues log, until I have something more specific to report :-) Just wanted to quickly put on your radar just in case.

[manishrjain]

Might be a duplicate of #2470 .

[billylindeman]

@manishrjain I second the adding curl back (or a cmdline option within dgraph binary to trigger the export)

[manishrjain]

Send a PR to add curl back? Might make a nice contribution, @billylindeman :-)