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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-3579) libhdfs: fix "WARNING in native method: JNI call made with exception pending" in errnoFromException
Date Fri, 20 Jul 2012 05:36:34 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3579?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13418929#comment-13418929
] 

Hadoop QA commented on HDFS-3579:
---------------------------------

-1 overall.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12537283/HDFS-3579.005.patch
  against trunk revision .

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

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

    +1 javac.  The applied patch does not increase the total number of javac compiler warnings.

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

    +1 eclipse:eclipse.  The patch built with eclipse:eclipse.

    +1 findbugs.  The patch does not introduce any new Findbugs (version 1.3.9) warnings.

    +1 release audit.  The applied patch does not increase the total number of release audit
warnings.

    -1 core tests.  The patch failed these unit tests in hadoop-hdfs-project/hadoop-hdfs:

                  org.apache.hadoop.hdfs.server.blockmanagement.TestBlocksWithNotEnoughRacks
                  org.apache.hadoop.hdfs.server.namenode.metrics.TestNameNodeMetrics

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

Test results: https://builds.apache.org/job/PreCommit-HDFS-Build/2874//testReport/
Console output: https://builds.apache.org/job/PreCommit-HDFS-Build/2874//console

This message is automatically generated.
                
> libhdfs: fix "WARNING in native method: JNI call made with exception pending" in errnoFromException
> ---------------------------------------------------------------------------------------------------
>
>                 Key: HDFS-3579
>                 URL: https://issues.apache.org/jira/browse/HDFS-3579
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: libhdfs
>    Affects Versions: 2.1.0-alpha
>            Reporter: Colin Patrick McCabe
>            Assignee: Colin Patrick McCabe
>            Priority: Minor
>             Fix For: 2.1.0-alpha
>
>         Attachments: HDFS-3579.004.patch, HDFS-3579.005.patch
>
>
> Running a libhdfs test program with -Xcheck:jni reveals some problems.
> {code}
> WARNING in native method: JNI call made with exception pending
> WARNING in native method: JNI call made with exception pending
> WARNING in native method: JNI call made with exception pending
> WARNING in native method: JNI call made with exception pending
> WARNING in native method: JNI call made with exception pending
> Exception in thread "main" java.io.IOException: ...
> {code}
> The problem seems to be that in errnoFromException, we are calling classNameOfObject
and some other JNI methods prior to clearing the pending exception.  It should be simple enough
to avoid doing this.

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