Speed up sorted scroll when the index sort matches the search sort #25138
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Sorted scroll search can use early termination when the index sort matches the scroll search sort. The optimization can be done after the first query (which still needs to collect all documents) by applying a query that only matches documents that are greater than the last doc retrieved in the previous request. Since the index is sorted, retrieving the list of documents that are greater than the last doc only requires a binary search on each segment. This change introduces this new query called `SortedSearchAfterDocQuery` and apply it when possible. Scrolls with this optimization will search all documents on the first request and then will early terminate each segment after $size doc for any subsequent requests. Relates elastic#6720
jimczi
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jpountz
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Jun 9, 2017
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Oops actually your changes are unrelated to adding early-termination support to TopFieldCollector (which would still be a good thing to do I think :)), LGTM! |
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Thanks @jpountz ! |
jasontedor
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Jun 12, 2017
* master: Do not swallow node lock failed exception Revert "Revert "Sense for VirtualBox and $HOME when deciding to turn on vagrant testing. (elastic#24636)"" Aggregations bug: Significant_text fails on arrays of text. (elastic#25030) Speed up sorted scroll when the index sort matches the search sort (elastic#25138) TranslogTests.testWithRandomException ignored a possible simulated OOM when trimming files Adapt TranslogTests.testWithRandomException to checkpoint syncing on trim
jasontedor
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Jun 13, 2017
* master: Explicitly reject duplicate data paths Do not swallow node lock failed exception Revert "Revert "Sense for VirtualBox and $HOME when deciding to turn on vagrant testing. (elastic#24636)"" Aggregations bug: Significant_text fails on arrays of text. (elastic#25030) Speed up sorted scroll when the index sort matches the search sort (elastic#25138) TranslogTests.testWithRandomException ignored a possible simulated OOM when trimming files Adapt TranslogTests.testWithRandomException to checkpoint syncing on trim Change BWC versions on get mapping 404s Fix get mappings HEAD requests TranslogTests#commit didn't allow for a concurrent closing of a view Fix handling of exceptions thrown on HEAD requests Fix comment formatting in EvilLoggerTests Remove unneeded weak reference from prefix logger Test: remove faling test that relies on merge order
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Sorted scroll search can use early termination when the index sort matches the scroll search sort.
The optimization can be done after the first query (which still needs to collect all documents)
by applying a query that only matches documents that are greater than the last doc retrieved in the previous request.
Since the index is sorted, retrieving the list of documents that are greater than the last doc
only requires a binary search on each segment.
This change introduces this new query called
SortedSearchAfterDocQueryand apply it when possible.Scrolls with this optimization will search all documents on the first request and then will early terminate each segment
after $size doc for any subsequent requests.
Relates #6720