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| author | Henning Baldersheim <balder@yahoo-inc.com> | 2020-04-15 10:15:25 +0000 |
|---|---|---|
| committer | Henning Baldersheim <balder@yahoo-inc.com> | 2020-04-15 10:16:09 +0000 |
| commit | 712ad877d53849772f29b6962a5cb261131e3668 (patch) | |
| tree | 3fe727339d5f94a9a0295865db983282402b255b /configdefinitions | |
| parent | 1ee3a5aa8d674b1456b684c583a96092be91a344 (diff) | |
Introduce top-k-probability and use it to fetch correct proper amount of hits from each partition
Diffstat (limited to 'configdefinitions')
| -rw-r--r-- | configdefinitions/src/vespa/dispatch.def | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/configdefinitions/src/vespa/dispatch.def b/configdefinitions/src/vespa/dispatch.def index 21001eb3af0..3f553b5b8ba 100644 --- a/configdefinitions/src/vespa/dispatch.def +++ b/configdefinitions/src/vespa/dispatch.def @@ -23,6 +23,13 @@ distributionPolicy enum { ROUNDROBIN, ADAPTIVE } default=ROUNDROBIN ## don't use it if you don't (really) mean it. maxHitsPerNode int default=2147483647 +## Probability for getting the correct topK documents. +## A value of 1.0 will ask all partitions for topK documents. +## Any value between <0, 1> will use a Student T fith 30 degrees freedom and compute a K value that +## will give you the topK documents according to this formulae. +## q = k/n + qT (p',30) x √(k × (1/n) × (1 − 1/n)) +topKProbability double default=1.0 + # Is multi-level dispatch configured for this cluster # Deprecated, will go away soon, NOOP useMultilevelDispatch bool default=false |