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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-3159) FileSystem cache keep overwriting cached value
Date Fri, 04 Apr 2008 07:51:24 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-3159?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12585438#action_12585438

Hadoop QA commented on HADOOP-3159:

+1 overall.  Here are the results of testing the latest attachment 
against trunk revision 643282.

    @author +1.  The patch does not contain any @author tags.

    tests included +1.  The patch appears to include 3 new or modified tests.

    javadoc +1.  The javadoc tool did not generate any warning messages.

    javac +1.  The applied patch does not generate any new javac compiler warnings.

    release audit +1.  The applied patch does not generate any new release audit warnings.

    findbugs +1.  The patch does not introduce any new Findbugs warnings.

    core tests +1.  The patch passed core unit tests.

    contrib tests +1.  The patch passed contrib unit tests.

Test results: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/2154/testReport/
Findbugs warnings: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/2154/artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Checkstyle results: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/2154/artifact/trunk/build/test/checkstyle-errors.html
Console output: http://hudson.zones.apache.org/hudson/job/Hadoop-Patch/2154/console

This message is automatically generated.

> FileSystem cache keep overwriting cached value
> ----------------------------------------------
>                 Key: HADOOP-3159
>                 URL: https://issues.apache.org/jira/browse/HADOOP-3159
>             Project: Hadoop Core
>          Issue Type: Bug
>    Affects Versions: 0.16.2
>            Reporter: Tsz Wo (Nicholas), SZE
>            Assignee: Tsz Wo (Nicholas), SZE
>            Priority: Blocker
>             Fix For: 0.16.3, 0.17.0
>         Attachments: 3159_20080402.patch, 3159_20080403.patch
> Consider the following:
> {code}
> Configuration conf1 = new Configuration();
> FileSystem fs1 = FileSystem.get(conf1); //conf1 may be modified, the cache key stored
will use the modified values.
> Configuration conf2 = new Configuration(); //create another conf, which won't have the
modified values.
> FileSystem fs2 = FileSystem.get(conf2); //may initialize another FileSystem instead of
returning the cached FileSystem, since conf2 does not have the modified values initially.
> {code}
> Therefore, FileSystem.get(conf) may keeps creating FileSystem and replaces the cached

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