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https://issues.apache.org/jira/browse/HADOOP-2342?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12549480
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Tom White commented on HADOOP-2342:
-----------------------------------
I built a distribution with this patch and got the following error. It looks
like MiniDFSCluster and NameNode are loaded by different classloaders which
causes the package access on createNameNode to fail.
>bin/hadoop jar hadoop-0.16.0-dev-test.jar dfsthroughput
Local = /tmp/hadoop-tom/mapred/temp
Writing local time: 246
Reading local time: 219
Writing raw time: 225
Reading raw time: 216
Writing checked time: 219
Reading checked time: 238
java.lang.IllegalAccessError: tried to access method
org.apache.hadoop.dfs.NameNode.createNameNode([Ljava/lang/String;Lorg/apache/hadoop/conf/Configuration;)Lorg/apache/hadoop/dfs/NameNode;
from class org.apache.hadoop.dfs.MiniDFSCluster
at org.apache.hadoop.dfs.MiniDFSCluster.<init>(MiniDFSCluster.java:179)
at org.apache.hadoop.dfs.MiniDFSCluster.<init>(MiniDFSCluster.java:118)
at org.apache.hadoop.dfs.MiniDFSCluster.<init>(MiniDFSCluster.java:90)
at
org.apache.hadoop.dfs.BenchmarkThroughput.main(BenchmarkThroughput.java:190)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at
org.apache.hadoop.util.ProgramDriver$ProgramDescription.invoke(ProgramDriver.java:68)
at org.apache.hadoop.util.ProgramDriver.driver(ProgramDriver.java:139)
at org.apache.hadoop.test.AllTestDriver.main(AllTestDriver.java:75)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at org.apache.hadoop.util.RunJar.main(RunJar.java:155)
> create a micro-benchmark for measure local-file versus hdfs read
> ----------------------------------------------------------------
>
> Key: HADOOP-2342
> URL: https://issues.apache.org/jira/browse/HADOOP-2342
> Project: Hadoop
> Issue Type: Test
> Components: dfs
> Reporter: Owen O'Malley
> Assignee: Owen O'Malley
> Fix For: 0.16.0
>
> Attachments: throughput.patch
>
>
> We should have a benchmark that measures reading a 10g file from hdfs and
> from local disk.
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