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https://issues.apache.org/jira/browse/HDFS-15094?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17010059#comment-17010059
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Ayush Saxena commented on HDFS-15094:
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if in that ugi.equals method instead of doing == for subject, if we call equals
for the subject, then we could have used it but doing that seems not very safe,
Discussed internally regarding tweaking the ugi class this way, but...
> RBF : Reuse ugi string in ConnectionPoolID
> ------------------------------------------
>
> Key: HDFS-15094
> URL: https://issues.apache.org/jira/browse/HDFS-15094
> Project: Hadoop HDFS
> Issue Type: Improvement
> Reporter: Ayush Saxena
> Assignee: Ayush Saxena
> Priority: Major
> Attachments: HDFS-15094-01.patch, HDFS-15094-02.patch
>
>
> The connectionPoolID Hash Code and equals contains ugi.toString(), These
> methods are used as part of getConnection() in ConnectionManager as part of
> every call.
> The ugi.toString() eats up considerable amount of time, the Hash Calculation
> itself is ~10 percent of the total time of the call. And even more for the
> equals method.
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