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From "Christopher Tubbs (JIRA)" <>
Subject [jira] [Commented] (ACCUMULO-3033) SiteConfiguration gets invoked frequently and scans all configuration items
Date Thu, 29 Oct 2015 16:30:28 GMT


Christopher Tubbs commented on ACCUMULO-3033:

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:
>             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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