[topo] Refactor ExpandCells to not error on valid aliases
#8291
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Signed-off-by: Andrew Mason <[email protected]>
A couple other changes here: - Store the output cells in a set to dedupe the final slice. This covers the case where a caller passes `"alias,cell1"` where `cell1` is in the cell list for `alias`. Without a set, it would appear twice in the final result. - Add an inner function to correct `defer` semantics on the cancel funcs. Defering within the scope of a for loop is generally not what we want, since all of the deferred functions will pile up until the total function is done. Fixes vitessio#8290. Signed-off-by: Andrew Mason <[email protected]>
rafael
approved these changes
Jun 9, 2021
| if err2 == nil { | ||
| outputCells = append(outputCells, alias.Cells...) | ||
| } | ||
| if err != nil { |
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For my understanding, here is the bug in the current code. Per conversation with @ajm188
we don't nil out err if err2 is nil, so even if there's a valid alias, we still return the error from trying to look up the alias as pure cell
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Jul 23, 2021
…_aliases [topo] Refactor `ExpandCells` to not error on valid aliases Signed-off-by: Andrew Mason <[email protected]>
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Description
A couple other changes here, in addition to the title:
the case where a caller passes
"alias,cell1"wherecell1is in thecell list for
alias. Without a set, it would appear twice in the finalresult.
defersemantics on the cancelfuncs. Defering within the scope of a for loop is generally not what we
want, since all of the deferred functions will pile up until the total
function is done.
Related Issue(s)
Fixes #8290
Checklist
Deployment Notes