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From "Abhijit Suresh Shingate (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-2331) Hdfs compilation fails
Date Thu, 15 Sep 2011 07:10:17 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2331?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13105163#comment-13105163
] 

Abhijit Suresh Shingate commented on HDFS-2331:
-----------------------------------------------

{quote}
-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.
{quote}

Attached patch fixes the compilation issue with jdk version < 1.6.0_26

Manual Test:-
Tested build with jdk to 1.6.0_16

Command: mvn clean install


{quote}
-1 findbugs. The patch appears to introduce 2 new Findbugs (version 1.3.9) warnings.
{quote}
These are introduced in DFSOutputStream class which i have not modified.



{quote}
-1 core tests. The patch failed these unit tests:
org.apache.hadoop.hdfs.TestDfsOverAvroRpc
org.apache.hadoop.hdfs.server.blockmanagement.TestHost2NodesMap
{quote}
These tests are failing from previous builds only and not because of this patch.






> Hdfs compilation fails
> ----------------------
>
>                 Key: HDFS-2331
>                 URL: https://issues.apache.org/jira/browse/HDFS-2331
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: build
>    Affects Versions: 0.23.0, 0.24.0
>            Reporter: Abhijit Suresh Shingate
>            Assignee: Abhijit Suresh Shingate
>             Fix For: 0.23.0, 0.24.0
>
>         Attachments: HDFS-2331-1.patch, HDFS-2331.patch
>
>   Original Estimate: 1h
>  Remaining Estimate: 1h
>
> I am trying to perform complete build from trunk folder but the compilation fails.
> *Commandline:*
> mvn clean install  
> *Error Message:*
> [ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:2.
> 3.2:compile (default-compile) on project hadoop-hdfs: Compilation failure
> [ERROR] \Hadoop\SVN\trunk\hadoop-hdfs-project\hadoop-hdfs\src\main\java\org
> \apache\hadoop\hdfs\web\WebHdfsFileSystem.java:[209,21] type parameters of <T>T
> cannot be determined; no unique maximal instance exists for type variable T with
>  upper bounds T,java.lang.Object
> [ERROR] -> [Help 1]
> [ERROR]
> [ERROR] To see the full stack trace of the errors, re-run Maven with the -e swit
> ch.
> [ERROR] Re-run Maven using the -X switch to enable full debug logging.
> [ERROR]
> [ERROR] For more information about the errors and possible solutions, please rea
> d the following articles:
> [ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoFailureExc
> eption
> [ERROR]
> [ERROR] After correcting the problems, you can resume the build with the command
> This is because of known reason
> [http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6302954]
> {code:title=WebHdfsFileSystem.java|borderStyle=solid}
> Following is the code snippet with issue.
>   private <T> T run(final HttpOpParam.Op op, final Path fspath,
>       final Param<?,?>... parameters) throws IOException {
>     final HttpURLConnection conn = httpConnect(op, fspath, parameters);
>     validateResponse(op, conn);
>     try {
>       return jsonParse(conn.getInputStream());
>     } finally {
>       conn.disconnect();
>     }
>   }
> {code} 
> Fix to the issue
> {code:title=WebHdfsFileSystem.java|borderStyle=solid}
> Following is the fix to the issue.
>   private <T> T run(final HttpOpParam.Op op, final Path fspath,
>       final Param<?,?>... parameters) throws IOException {
>     final HttpURLConnection conn = httpConnect(op, fspath, parameters);
>     validateResponse(op, conn);
>     try {
>       return WebHdfsFileSystem.<T>jsonParse(conn.getInputStream());
>     } finally {
>       conn.disconnect();
>     }
>   }
> {code} 

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