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From Arun C Murthy <...@hortonworks.com>
Subject Re: Hadoop-2 generics compilation error
Date Fri, 29 Jun 2012 18:01:54 GMT
HDFS-3113 is committed? Or, are you running with the patch yourself?

It's still PA and I see Daryn reviewing it yet...

Arun

On Jun 28, 2012, at 10:27 PM, lars hofhansl wrote:

> Since HDFS-3113 was integrated into Hadoop-2 I get the compilation errors of the following
type:
> 
> [ERROR] /home/lars/dev/hadoop-2/hadoop-hdfs-project/hadoop-hdfs-httpfs/src/main/java/org/apache/hadoop/fs/http/server/HttpFSServer.java:[407,36]
incompatible types; no instance(s) of type variable(s) V exist so that V conforms to boolean
> 
> 
> Indeed at line 407 I see:
> 
>         boolean hasData = params.get(DataParam.NAME, DataParam.class);
> 
> 
> When I change that to
>         Boolean hasData = params.get(DataParam.NAME, DataParam.class);
> 
> 
> instead (along with long to Long, short to Short, etc, later in that file), everything
compiles fine.
> 
> $ javac -version
> javac 1.6.0_24
> 
> 
> $ java -version
> java version "1.6.0_24"
> OpenJDK Runtime Environment (IcedTea6 1.11.3) (fedora-67.1.11.3.fc16-x86_64)
> OpenJDK 64-Bit Server VM (build 20.0-b12, mixed mode)
> 
> Apparently OpenJDK gets mixed up on the type inference here. Can we change this in the
way I suggest so that Hadoop-2 (and presumably trunk) can be 
> compiled with OpenJDK?
> I'm happy to create a jira and (trivial) patch.
> 
> 
> Thanks.
> 
> -- Lars
> 

--
Arun C. Murthy
Hortonworks Inc.
http://hortonworks.com/



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