Steve Loughran created HADOOP-13985:
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Summary: s3guard: add a version marker to every table
Key: HADOOP-13985
URL: https://issues.apache.org/jira/browse/HADOOP-13985
Project: Hadoop Common
Issue Type: Sub-task
Components: fs/s3
Affects Versions: HADOOP-13345
Reporter: Steve Loughran
This is something else we need before any preview: a way to identify a table
version, so that if future versions change the table structure:
* older clients can recognise that it's a newer format, and fail
* the future version can identify that it's an older format, and fail until
some fsck-upgrade operation has taken place
I think something like a row on a path which is impossible in a real
filesystem, such as "../VERSION" would allow a version marker to go in; the
length field could be abused for the version number.
This field would be something that'd be checked in init(), so be the simple
test for table existence we need for faster init
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