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From "Brahma Reddy Battula (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HADOOP-11659) o.a.h.fs.FileSystem.Cache#remove should use a single hash map lookup
Date Wed, 04 Mar 2015 18:55:38 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-11659?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Brahma Reddy Battula updated HADOOP-11659:
------------------------------------------
    Attachment: HADOOP-11653.patch

> o.a.h.fs.FileSystem.Cache#remove should use a single hash map lookup
> --------------------------------------------------------------------
>
>                 Key: HADOOP-11659
>                 URL: https://issues.apache.org/jira/browse/HADOOP-11659
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: fs
>    Affects Versions: 2.6.0
>            Reporter: Gera Shegalov
>            Assignee: Brahma Reddy Battula
>            Priority: Trivial
>         Attachments: HADOOP-11653.patch
>
>
> The method looks up the same key in the same hash map potentially 3 times
> {code}
> if (map.containsKey(key) && fs == map.get(key)) {
>   map.remove(key)
> {code}
> Instead it could do a single lookup
> {code}
> FileSystem cachedFs = map.remove(key);
> {code}
> and then test cachedFs == fs or something else.



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