[jira] [Resolved] (ACCUMULO-3079) improve system iterator performance by collapsing call stack

["Michael Miller (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ACCUMULO-3079?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Michael Miller resolved ACCUMULO-3079.
--------------------------------------
    Resolution: Fixed

> 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
>            Assignee: Michael Miller
>            Priority: Critical
>             Fix For: 2.0.0
>
>         Attachments: iterator_performance_20140822_1.patch, iterator_performance_test_harness.tar.gz
>
>          Time Spent: 12.5h
>  Remaining Estimate: 0h
>
> 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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