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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-11659) o.a.h.fs.FileSystem.Cache#remove should use a single hash map lookup
Date Wed, 04 Mar 2015 20:37:38 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-11659?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14347538#comment-14347538

Hadoop QA commented on HADOOP-11659:

{color:red}-1 overall{color}.  Here are the results of testing the latest attachment 
  against trunk revision ed70fa1.

    {color:green}+1 @author{color}.  The patch does not contain any @author tags.

    {color:red}-1 tests included{color}.  The patch doesn't appear to include any new or modified
                        Please justify why no new tests are needed for this patch.
                        Also please list what manual steps were performed to verify this patch.

    {color:green}+1 javac{color}.  The applied patch does not increase the total number of
javac compiler warnings.

    {color:green}+1 javadoc{color}.  There were no new javadoc warning messages.

    {color:green}+1 eclipse:eclipse{color}.  The patch built with eclipse:eclipse.

    {color:green}+1 findbugs{color}.  The patch does not introduce any new Findbugs (version
2.0.3) warnings.

    {color:green}+1 release audit{color}.  The applied patch does not increase the total number
of release audit warnings.

    {color:green}+1 core tests{color}.  The patch passed unit tests in hadoop-common-project/hadoop-common.

Test results: https://builds.apache.org/job/PreCommit-HADOOP-Build/5846//testReport/
Console output: https://builds.apache.org/job/PreCommit-HADOOP-Build/5846//console

This message is automatically generated.

> 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: Minor
>         Attachments: HADOOP-11659.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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