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app/vmselect/netstorage: reduce the number of disk seeks when the query processes big number of time series

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Aliaksandr Valialkin 2019-09-28 20:30:58 +03:00
parent 67d44b0845
commit b7ee2e7af2
1 changed files with 9 additions and 0 deletions
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9
app/vmselect/netstorage/netstorage.go
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@ -520,6 +520,15 @@ func ProcessSearchQuery(sq *storage.SearchQuery, fetchData bool, deadline Deadli
pts.metricName = metricName
pts.addrs = addrs
}
// Sort rss.packedTimeseries by the first addr offset in order
// to reduce the number of disk seeks during unpacking in RunParallel.
// In this case tmpBlocksFile must be read almost sequentially.
sort.Slice(rss.packedTimeseries, func(i, j int) bool {
pts := rss.packedTimeseries
return pts[i].addrs[0].offset < pts[j].addrs[0].offset
})
return &rss, nil
}