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Subject: maven, hadoop, zookeeper, and giraph!
From: Jeffrey Yunes <jeff.yunes@berkeley.edu>
In-Reply-To: <1329437528.39481.ezmlm@incubator.apache.org>
Date: Thu, 16 Feb 2012 18:12:39 -0800
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To: giraph-user@incubator.apache.org

Hi Giraph community,
I think I followed all of the directions (for a Giraph on a =
psuedo-cluster), and it looks like

> mvn clean test -Dprop.mapred.job.tracker=3Dlocalhost:9001

runs fine. However, I'm new to the Hadoop infrastructure, and have a =
couple of questions about getting started with Giraph.

1)
> hadoop jar target/giraph-0.2-SNAPSHOT-jar-with-dependencies.jar =
org.apache.giraph.benchmark.PageRankBenchmark -e 1 -s 3 -v -V 50 -w 3

gives me the error "java.lang.NullPointerException at at =
org.apache.giraph.benchmark.PageRankBenchmark.run(PageRankBenchmark.java:1=
27)" It looks like some error with configuration?

2) How should I / do I enable the log4j? An appender that writes to the =
HDFS? How else could I grep all my logs for errors and things?

3) With regard to Giraph and maven, none of the directions suggested =
doing "local overrides." Therefore, why should I expect my Giraph =
installation to refer to libraries and configuration in =
"~/Applications/hadoop or zookeeper" rather than those in "~.m2/repo?"

4) Why doesn't running maven for Giraph install hadoop along the way (or =
does it)?

I'd appreciate if you'd help improve my understanding!

Thanks!
-Jeff