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https://issues.apache.org/jira/browse/ACCUMULO-4779?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16343462#comment-16343462
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Keith Turner commented on ACCUMULO-4779:
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After fixing the ContextManager code, I found another place through profiling
where creating iterators was reading config in a really slow way. I am
thinking of making AccumuloConfiguration cache the config that has a given
prefix.
https://github.com/apache/accumulo/blob/rel/1.8.1/core/src/main/java/org/apache/accumulo/core/iterators/IteratorUtil.java#L158
> Instantiating iterator accesses config in a very slow way
> ---------------------------------------------------------
>
> Key: ACCUMULO-4779
> URL: https://issues.apache.org/jira/browse/ACCUMULO-4779
> Project: Accumulo
> Issue Type: Bug
> Affects Versions: 1.7.3, 1.8.1
> Reporter: Keith Turner
> Assignee: Keith Turner
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.7.4, 1.9.0, 2.0.0
>
> Time Spent: 4h 10m
> Remaining Estimate: 0h
>
> I noticed this will looking at profiling data. When creating iterators all
> configuration is put in a TreeMap just to get two keys out.
> The following code
> https://github.com/apache/accumulo/blob/rel/1.8.1/start/src/main/java/org/apache/accumulo/start/classloader/vfs/ContextManager.java#L118
> calls the following code
> https://github.com/apache/accumulo/blob/rel/1.8.1/core/src/main/java/org/apache/accumulo/core/conf/AccumuloConfiguration.java#L153
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