Andrzej Bialecki created SOLR-12723:
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Summary: Reduce object creation in HashBasedRouter
Key: SOLR-12723
URL: https://issues.apache.org/jira/browse/SOLR-12723
Project: Solr
Issue Type: Improvement
Security Level: Public (Default Security Level. Issues are Public)
Reporter: Andrzej Bialecki
Assignee: Andrzej Bialecki
Fix For: 7.5
When the default {{CompositeIdRouter}} is used it calls for every update
{{HashBasedRouter.hashToSlice}} method, which obtains a collection of active
slices from the current {{DocCollection}} and then iterates over it checking
what range contains the document's id hash.
Each time this creates a new iterator, which is wasteful - a much lightweight
approach would be to construct a {{Slice[]}} when {{DocCollection}} is
constructed and use indexed access to this array.
This change has especially visible impact on simulator performance for large
scale tests, where other costs are not present.
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