Todd Lipcon created KUDU-2157:
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Summary: 1.5 -> 1.4 -> 1.5 downgrade/re-upgrade can result in
non-startable tservers
Key: KUDU-2157
URL: https://issues.apache.org/jira/browse/KUDU-2157
Project: Kudu
Issue Type: Bug
Components: fs, tserver
Affects Versions: 1.4.0, 1.5.0
Reporter: Todd Lipcon
I had a cluster running 1.5, which I then downgraded to 1.4 and ran for a while
(including tablet copies happening). I then upgraded back to 1.5, but the
tservers would not start.
The issue is that the tablet-meta files on 1.5 had gotten invalid path IDs
written into them during tablet copies that occurred on 1.4. The 1.4 servers
had copied a remote TabletMeta file, and preserved the unknown protobuf field
and serialized it locally. Then when we upgraded again, they failed to validate
since they didn't match the local path UUIDs.
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