bboltcachestorage: delete links outside of cursor #5692
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Needs a test. |
The `emptyBranchWithParents` method could accidentally leave link entries that shouldn't exist. When finding these links, deleting during the iteration can sometimes cause the cursor to jump entries that should be deleted. This changes the code path to delete the links outside of the iteration to avoid this. This is caused by a long-standing bug in bolt that can't be fixed easily. See etcd-io/bbolt#611 for details. Signed-off-by: Jonathan A. Sternberg <[email protected]>
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I attempted to test this by creating a result and then having a bunch of links with different digests point to the same source and target ids and wasn't able to trigger it with the original code. I'm not sure what would be a good way to reproduce this. This has only happened a few times in a very large database and I'm not sure how big of a concern this is. I've moved this from draft to open but I don't think I'll be able to create a test case to exercise this code since the theory on the cause is mostly theoretical from that one issue. |
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The
emptyBranchWithParentsmethod could accidentally leave link entries that shouldn't exist. When finding these links, deleting during the iteration can sometimes cause the cursor to jump entries that should be deleted.This changes the code path to delete the links outside of the iteration to avoid this.
This is caused by a long-standing bug in bolt that can't be fixed easily. See etcd-io/bbolt#611 for details.