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https://issues.apache.org/jira/browse/ACCUMULO-3033?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14980724#comment-14980724
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Christopher Tubbs commented on ACCUMULO-3033:
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This seemed familiar, so I looked up and found ACCUMULO-2838. I don't know if
it's similar enough to model a fix here after that.
> SiteConfiguration gets invoked frequently and scans all configuration items
> ---------------------------------------------------------------------------
>
> Key: ACCUMULO-3033
> URL: https://issues.apache.org/jira/browse/ACCUMULO-3033
> Project: Accumulo
> Issue Type: Improvement
> Affects Versions: 1.5.0, 1.5.1, 1.6.0
> Reporter: Josh Elser
> Assignee: Josh Elser
> Fix For: 1.8.0
>
>
> I noticed yesterday that {{SiteConfiguration#getProperties(Map,
> PropertyFilter)}} is invoked very frequently (at least 30 times a second on
> my single machine) to extract the Iterator configurations before a table scan
> happens. Printing a stack trace shows that this is the dominating caller of
> {{getProperties}} is {{IteratorUtil#parseIterConf()}}.
> What this translates to is repeatedly reading, filtering and adding the same
> elements to a map to satisfy the
> {{AccumuloConfiguration#getPropertiesWithPrefix}} from an immutable source
> (accumulo-site.xml). While this is probably not a huge time waste in terms of
> actual time spent, it's repeatedly happening and will slow things down
> (especially when the underlying Hadoop Configuration is creating a new
> HashMap with the contents of the accumulo-site.xml for every call).
> Need to think about some options for making the "extract keys with this
> prefix" case faster from SiteConfiguration.
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