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https://issues.apache.org/jira/browse/ACCUMULO-3079?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Adam Fuchs updated ACCUMULO-3079:
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Attachment: iterator_performance_20140822_1.patch
Attached is a preliminary patch that results in about 50% performance
improvements for long scans of small entries (~10 bytes). It still needs a bit
of cleanup, but it is representative of the desired improvements.
> improve system iterator performance by collapsing call stack
> ------------------------------------------------------------
>
> Key: ACCUMULO-3079
> URL: https://issues.apache.org/jira/browse/ACCUMULO-3079
> Project: Accumulo
> Issue Type: Improvement
> Reporter: Adam Fuchs
> Fix For: 1.6.1, 1.7.0
>
> Attachments: iterator_performance_20140822_1.patch
>
>
> System iterators are at the core of the tightest loops in Accumulo, handling
> every key/value pair that traverses through a scan or a compaction. In many
> cases, iterators are the current performance bottleneck for Accumulo. Every
> bit that we can improve performance in the iterators translates into better
> performance for Accumulo.
> There are several strategies that can be applied to the current code base to
> improve performance, including:
> # Inlining calls that are hard for the JVM to inline at runtime
> # Moving checks for null outside of tight loops when they are invariants
> within the loop
> # Eliminating "no-op" iterators at iterator tree construction time
> # Making frequently used and assigned-once objects final (like iterator
> sources)
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