Add two repair tests to agent-antagonist #1793
Conversation
Discussing possible causes for the zeroes appearing at the beginning of an extent file (oxidecomputer#1788), one theory that came up was that the Extent was being repaired, and those zeroes came from reading the Extent from the repair API, not from the disk itself: only _one_ Region's Extents were bad, not all of them. In order to test this theory, add two new tests, both of which will contact an Agent to get a Region's details, then use the repair API to read Extent data files and either look for a block of zeroes at the beginning or write that to a temporary file and use the new `Extent::validate` routine.
There was a problem hiding this comment.
These changes are really just around looking for and checking around the #1788 all zeros situation, right? We might want to document somewhere how to do a setup where someone could run this, so that information is not lost to time.
| #[clap(short, long)] | ||
| region_id: Uuid, | ||
|
|
||
| /// Allow reading extents from a read-write downstairs that may not be |
There was a problem hiding this comment.
This seems fraught with peril. Can we expect this data to be good?
Or, is this more allowing us to connect to a downstairs that is serving a RW region, but that downstairs not actually taking live IO from an upstairs?
There was a problem hiding this comment.
Right, we can't expect it to be good no, if it's accepting IO - but in cases where it's RW downstairs that's not currently doing anything, we should expect the data to be good.
| .build() | ||
| .unwrap(); | ||
|
|
||
| loop { |
There was a problem hiding this comment.
This will just run forever, or until you control-C it?
2 participants
Discussing possible causes for the zeroes appearing at the beginning of an extent file (#1788), one theory that came up was that the Extent was being repaired, and those zeroes came from reading the Extent from the repair API, not from the disk itself: only one Region's Extents were bad, not all of them.
In order to test this theory, add two new tests, both of which will contact an Agent to get a Region's details, then use the repair API to read Extent data files and either look for a block of zeroes at the beginning or write that to a temporary file and use the new
Extent::validateroutine.