Upgrading Prometheus 2.0 from beta2 to beta5 fails to start.

[laverite]

What did you do?
Updated from v2.0.0-beta.2 -> v2.0.0-beta.5

What did you expect to see?
I expected prometheus beta5 to start properly.

What did you see instead? Under which circumstances?
beta5 failed to start complaining about missing lock file. tried to touch a lockfile and then it complained about a missing chunks dir. removed my touched lock file and reverted back to beta2 and things look fine again.

Environment
k8s 1.7.4 on bare-metal

• System information:

  Linux 4.9.13-1 x86_64

• Prometheus version:

prometheus, version 2.0.0-beta.5 (branch: HEAD, revision: 64c7932)
build user: root@df40cc0bd79b
build date: 20170921-16:23:04
go version: go1.8.3

prometheus, version 2.0.0-beta.2 (branch: HEAD, revision: a52f082)
build user: root@41a0740ea598
build date: 20170818-08:16:50
go version: go1.8.3

• Logs:

level=error ts=2017-09-24T23:40:02.426894698Z caller=main.go:317 msg="Opening storage failed" err="open block /prometheus/data/01BTTYEYSJJFT86B8X7286ETW9: try lock file: open /prometheus/data/01BTTYEYSJJFT86B8X7286ETW9/index: no such file or directory"

level=error ts=2017-09-24T23:38:06.766703158Z caller=main.go:317 msg="Opening storage failed" err="open block /prometheus/data/01BTTYEYSJJFT86B8X7286ETW9: open /prometheus/data/01BTTYEYSJJFT86B8X7286ETW9/chunks: no such file or directory"`

[grobie]

It's recommended to read the release notes before attempting an upgrade. The beta.4 release is incompatible with previous versions. https://github.com/prometheus/prometheus/releases

[lock]

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