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https://issues.apache.org/jira/browse/HDFS-12143?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16091661#comment-16091661
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Daryn Sharp commented on HDFS-12143:
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This patch is intended to surgically fix the unnecessary performance
degradation caused by preconditions. The mathematical comparisons, dubious as
they may be, are not part of the problem.
> Improve performance of getting and removing inode features
> ----------------------------------------------------------
>
> Key: HDFS-12143
> URL: https://issues.apache.org/jira/browse/HDFS-12143
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: namenode
> Affects Versions: 2.8.0
> Reporter: Daryn Sharp
> Assignee: Daryn Sharp
> Attachments: HDFS-12143.patch
>
>
> Getting a feature uses an iterator which is less performant than an indexed
> for loop. Feature lookups are becoming more prolific so cycles count.
> Removing a feature requires building a string for up to 3 precondition
> checks. The worst case of 3 is the penalty for a successful removal.
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