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Fix race when stopping chunks memcached client #4511

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merged 2 commits into from
Oct 14, 2021
Merged

Fix race when stopping chunks memcached client #4511

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dd4efac
Fix race when stopping chunks memcached client
bboreham Oct 1, 2021
a44e9fc
simplify select
bboreham Oct 11, 2021
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9 changes: 7 additions & 2 deletions pkg/chunk/cache/memcached.go
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Original file line number Diff line number Diff line change
Expand Up @@ -89,7 +89,13 @@ func NewMemcached(cfg MemcachedConfig, client MemcachedClient, name string, reg
batchID: input.batchID,
}
res.found, res.bufs, res.missed = c.fetch(input.ctx, input.keys)
input.resultCh <- res
// No-one will be reading from resultCh if we were asked to quit
// during the fetch, so check again before writing to it.
select {
case <-c.quit:
return
case input.resultCh <- res:
}
}
}
}()
Expand Down Expand Up @@ -214,7 +220,6 @@ loopResults:
results[result.batchID] = result
}
}
close(resultsCh)

for _, result := range results {
if result == nil {
Expand Down