write seqfiles to hdfs from a java app without "hadoop jar" command

[Marc Sturlese <ma...@gmail.com>]

Hey there, I need to write seqfiles to an hdfs cluster using a normal java
app but can't use "hadoop jar".
I have access to the installation of a hadoop node.
I've reached the goal launching my app with java -jar and manually changing
de configuration in the code:

Configuration hadoopConf = new Configuration();
hadoopConf.addResource(new Path("/opt/hadoop/install/conf/core-site.xml"));
hadoopConf.addResource(new Path("/opt/hadoop/install/conf/hdfs-site.xml"));
hadoopConf.reloadConfiguration();
sfw = SequenceFile.createWriter(FileSystem.get(hadoopConf), hadoopConf,
...);

** /opt/hadoop/install/conf/core-site.xml and
/opt/hadoop/install/conf/hdfs-site.xml are the conf files of the cluster.

This works but I would like to know if there's a more elegant way to do
that. Specifying hadoop env vars to the java classpath or something like
that.

Thanks in advance.

--
View this message in context: http://lucene.472066.n3.nabble.com/write-seqfiles-to-hdfs-from-a-java-app-without-hadoop-jar-command-tp2677234p2677234.html
Sent from the Hadoop lucene-users mailing list archive at Nabble.com.

Re: write seqfiles to hdfs from a java app without "hadoop jar" command

[Harsh J <qw...@gmail.com>]

Adding the config path to the classpath makes Configuration load it
automatically ('stead of you having to add resource files manually).

java -classpath
/opt/hadoop/install/conf:/opt/hadoop/install/hadoop-*-core.jar -jar
yourjar.jar

[You'll need more jars on your classpath, though - like log4j,
jackson, etc., all found under lib/*.jar]

On Tue, Mar 15, 2011 at 1:55 AM, Marc Sturlese <ma...@gmail.com> wrote:
> Hey there, I need to write seqfiles to an hdfs cluster using a normal java
> app but can't use "hadoop jar".
> I have access to the installation of a hadoop node.
> I've reached the goal launching my app with java -jar and manually changing
> de configuration in the code:
>
> Configuration hadoopConf = new Configuration();
> hadoopConf.addResource(new Path("/opt/hadoop/install/conf/core-site.xml"));
> hadoopConf.addResource(new Path("/opt/hadoop/install/conf/hdfs-site.xml"));
> hadoopConf.reloadConfiguration();
> sfw = SequenceFile.createWriter(FileSystem.get(hadoopConf), hadoopConf,
> ...);
>
> ** /opt/hadoop/install/conf/core-site.xml and
> /opt/hadoop/install/conf/hdfs-site.xml are the conf files of the cluster.
>
> This works but I would like to know if there's a more elegant way to do
> that. Specifying hadoop env vars to the java classpath or something like
> that.
>
> Thanks in advance.
>
> --
> View this message in context: http://lucene.472066.n3.nabble.com/write-seqfiles-to-hdfs-from-a-java-app-without-hadoop-jar-command-tp2677234p2677234.html
> Sent from the Hadoop lucene-users mailing list archive at Nabble.com.
>



-- 
Harsh J
http://harshj.com