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From c..@apache.org
Subject svn commit: r824942 - in /hadoop/common/trunk: ./ .eclipse.templates/ ivy/ src/ src/test/ src/test/aop/ src/test/aop/build/ src/test/aop/org/ src/test/aop/org/apache/ src/test/aop/org/apache/hadoop/ src/test/aop/org/apache/hadoop/fi/
Date Tue, 13 Oct 2009 21:54:49 GMT
Author: cos
Date: Tue Oct 13 21:54:48 2009
New Revision: 824942

URL: http://svn.apache.org/viewvc?rev=824942&view=rev
Log:
HADOOP-6204. Implementing aspects development and fault injeciton framework for Hadoop. Contributed
by Konstantin Boudnik

Added:
    hadoop/common/trunk/src/test/aop/
    hadoop/common/trunk/src/test/aop/build/
    hadoop/common/trunk/src/test/aop/build/aop.xml
    hadoop/common/trunk/src/test/aop/org/
    hadoop/common/trunk/src/test/aop/org/apache/
    hadoop/common/trunk/src/test/aop/org/apache/hadoop/
    hadoop/common/trunk/src/test/aop/org/apache/hadoop/fi/
    hadoop/common/trunk/src/test/aop/org/apache/hadoop/fi/FiConfig.java
    hadoop/common/trunk/src/test/aop/org/apache/hadoop/fi/ProbabilityModel.java
    hadoop/common/trunk/src/test/fi-site.xml
Modified:
    hadoop/common/trunk/.eclipse.templates/.classpath
    hadoop/common/trunk/CHANGES.txt
    hadoop/common/trunk/build.xml
    hadoop/common/trunk/ivy.xml
    hadoop/common/trunk/ivy/libraries.properties
    hadoop/common/trunk/src/saveVersion.sh

Modified: hadoop/common/trunk/.eclipse.templates/.classpath
URL: http://svn.apache.org/viewvc/hadoop/common/trunk/.eclipse.templates/.classpath?rev=824942&r1=824941&r2=824942&view=diff
==============================================================================
--- hadoop/common/trunk/.eclipse.templates/.classpath (original)
+++ hadoop/common/trunk/.eclipse.templates/.classpath Tue Oct 13 21:54:48 2009
@@ -1,6 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <classpath>
 	<classpathentry kind="src" path="src/java"/>
+	<classpathentry kind="src" path="src/test/aop"/>
 	<classpathentry kind="src" path="src/test/core"/>
 	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER"/>
 	<classpathentry kind="var" path="ANT_HOME/lib/ant.jar"/>

Modified: hadoop/common/trunk/CHANGES.txt
URL: http://svn.apache.org/viewvc/hadoop/common/trunk/CHANGES.txt?rev=824942&r1=824941&r2=824942&view=diff
==============================================================================
--- hadoop/common/trunk/CHANGES.txt (original)
+++ hadoop/common/trunk/CHANGES.txt Tue Oct 13 21:54:48 2009
@@ -24,6 +24,9 @@
     HADOOP-6305. Unify build property names to facilitate cross-projects
     modifications (cos)
 
+    HADOOP-6204. Implementing aspects development and fault injeciton
+    framework for Hadoop (cos)
+
   OPTIMIZATIONS
 
   BUG FIXES

Modified: hadoop/common/trunk/build.xml
URL: http://svn.apache.org/viewvc/hadoop/common/trunk/build.xml?rev=824942&r1=824941&r2=824942&view=diff
==============================================================================
--- hadoop/common/trunk/build.xml (original)
+++ hadoop/common/trunk/build.xml Tue Oct 13 21:54:48 2009
@@ -252,7 +252,7 @@
     </copy>
 
     <exec executable="sh">
-       <arg line="src/saveVersion.sh ${version}"/>
+       <arg line="src/saveVersion.sh ${version} ${build.dir}"/>
     </exec>
 	
    <exec executable="sh">
@@ -260,6 +260,8 @@
    </exec>
   </target>
 
+  <import file="${test.src.dir}/aop/build/aop.xml"/>
+
   <!-- ====================================================== -->
   <!-- Compile the Java files                                 -->
   <!-- ====================================================== -->
@@ -381,7 +383,8 @@
     <tar compression="gzip" destfile="${build.classes}/bin.tgz">
       <tarfileset dir="bin" mode="755"/>
     </tar>
-    <jar jarfile="${hadoop-core.jar}"
+    <property name="jar.properties.list" value="commons-logging.properties, log4j.properties,
hadoop-metrics.properties" />
+    <jar jarfile="${build.dir}/${final.name}.jar"
          basedir="${build.classes}">
       <manifest>
         <section name="org/apache/hadoop">
@@ -390,13 +393,11 @@
           <attribute name="Implementation-Vendor" value="Apache"/>
         </section>
       </manifest>
-      <fileset file="${conf.dir}/commons-logging.properties"/>
-      <fileset file="${conf.dir}/log4j.properties"/>
-      <fileset file="${conf.dir}/hadoop-metrics.properties"/>
+      <fileset dir="${conf.dir}" includes="${jar.properties.list}" />
+      <fileset file="${jar.extra.properties.list}" />
     </jar>
   </target>
 
-
   <!-- ================================================================== -->
   <!-- Make the Hadoop metrics jar. (for use outside Hadoop)              -->
   <!-- ================================================================== -->
@@ -431,6 +432,9 @@
   <!-- ================================================================== -->
   <!-- Compile test code                                                  --> 
   <!-- ================================================================== -->
+  <!-- This is a wrapper for fault-injection needs-->
+  <target name="compile-tests" depends="compile-core-test"/> 
+
   <target name="compile-core-test" depends="compile-core-classes, ivy-retrieve-test, generate-test-records,
generate-avro-records">
     <mkdir dir="${test.core.build.classes}"/>
     <javac 
@@ -498,6 +502,75 @@
   </target>
 
   <!-- ================================================================== -->
+  <!-- Fault injection customization section.
+       These targets ought to be copied over to other projects and modified
+       as needed -->
+  <!-- ================================================================== -->
+  <target name="run-test-core-fault-inject" depends="injectfaults" 
+	  description="Run full set of the unit tests with fault injection">
+    <macro-run-tests-fault-inject target.name="run-test-core"
+      testcasesonly="false"/>
+  </target>
+
+  <target name="jar-test-fault-inject" depends="injectfaults" 
+    description="Make hadoop-test-fi.jar">
+    <macro-jar-test-fault-inject
+      target.name="jar-test"
+      jar.final.name="test.final.name"
+      jar.final.value="${test.final.name}-fi" />
+  </target>
+
+  <target name="jar-fault-inject" depends="injectfaults" 
+    description="Make hadoop-fi.jar">
+    <macro-jar-fault-inject
+      target.name="jar"
+      jar.final.name="final.name"
+      jar.final.value="${final.name}-fi" />
+  </target>
+
+  <!--This target is not included into the the top level list of target
+  for it serves a special "regression" testing purpose of non-FI tests in
+  FI environment -->
+  <target name="run-fault-inject-with-testcaseonly" depends="injectfaults">
+    <fail unless="testcase">Can't run this target without -Dtestcase setting!
+    </fail>
+    <macro-run-tests-fault-inject target.name="run-test-core" 
+      testcasesonly="true"/>
+  </target>
+  <!-- ================================================================== -->
+  <!-- End of Fault injection customization section                       -->
+  <!-- ================================================================== -->
+
+  <condition property="tests.notestcase">
+    <and>
+      <isfalse value="${test.fault.inject}"/>
+      <not>
+        <isset property="testcase"/>
+      </not>
+    </and>
+  </condition>
+  <condition property="tests.notestcase.fi">
+    <and>
+      <not>
+        <isset property="testcase" />
+      </not>
+      <istrue value="${test.fault.inject}" />
+    </and>
+  </condition>
+  <condition property="tests.testcase">
+    <and>
+      <isfalse value="${test.fault.inject}" />
+      <isset property="testcase" />
+    </and>
+  </condition>
+  <condition property="tests.testcase.fi">
+    <and>
+      <istrue value="${test.fault.inject}" />
+      <isset property="testcase" />
+    </and>
+  </condition>
+	     
+  <!-- ================================================================== -->
   <!-- Run unit tests                                                     --> 
   <!-- ================================================================== -->
   <target name="run-test-core" depends="compile-core-test" description="Run core unit
tests">
@@ -508,6 +581,8 @@
     <mkdir dir="${test.log.dir}"/>
   	<copy file="${test.src.dir}/hadoop-policy.xml" 
   	  todir="${test.build.extraconf}" />
+    <copy file="${test.src.dir}/fi-site.xml"
+      todir="${test.build.extraconf}" />
     <junit showoutput="${test.output}"
       printsummary="${test.junit.printsummary}"
       haltonfailure="${test.junit.haltonfailure}"
@@ -536,13 +611,30 @@
          <propertyref name="compile.c++"/>
       </syspropertyset>
       <classpath refid="test.classpath"/>
+      <syspropertyset id="FaultProbabilityProperties">
+        <propertyref regex="fi.*"/>
+      </syspropertyset>
       <formatter type="${test.junit.output.format}" />
-      <batchtest todir="${test.build.dir}" unless="testcase">
+      <batchtest todir="${test.build.dir}" if="tests.notestcase">
         <fileset dir="${test.src.dir}/core"
 	         includes="**/${test.include}.java"
 		 excludes="**/${test.exclude}.java" />
       </batchtest>
-      <batchtest todir="${test.build.dir}" if="testcase">
+      <batchtest todir="${test.build.dir}" if="tests.notestcase.fi">
+        <fileset dir="${test.src.dir}/aop"
+          includes="**/${test.include}.java"
+          excludes="**/${test.exclude}.java" />
+      </batchtest>
+      <batchtest todir="${test.build.dir}" if="tests.testcase">
+        <fileset dir="${test.src.dir}/core" includes="**/${testcase}.java"/>
+      </batchtest>
+      <batchtest todir="${test.build.dir}" if="tests.testcase.fi">
+        <fileset dir="${test.src.dir}/aop" includes="**/${testcase}.java"/>
+      </batchtest>
+      <!--The following batch is for very special occasions only when
+      a non-FI tests are needed to be executed against FI-environment -->
+      <batchtest todir="${test.build.dir}" if="special.fi.testcasesonly">
+        <fileset dir="${test.src.dir}/aop" includes="**/${testcase}.java"/>
         <fileset dir="${test.src.dir}/core" includes="**/${testcase}.java"/>
       </batchtest>
     </junit>
@@ -566,6 +658,7 @@
     <delete file="${test.build.dir}/testsfailed"/> 
     <property name="continueOnFailure" value="true"/> 
     <antcall target="run-test-core"/>
+    <antcall target="run-test-core-fault-inject"/>
     <available file="${test.build.dir}/testsfailed" property="testsfailed"/>
     <fail if="testsfailed">Tests failed!</fail> 
   </target>
@@ -1045,7 +1138,7 @@
   <!-- ================================================================== -->
   <!-- Clean.  Delete the build files, and their directories              -->
   <!-- ================================================================== -->
-  <target name="clean" depends="clean-contrib" description="Clean.  Delete the build files,
and their directories">
+  <target name="clean" depends="clean-contrib, clean-fi" description="Clean.  Delete the
build files, and their directories">
     <delete dir="${build.dir}"/>
     <delete dir="${docs.src}/build"/>
     <delete dir="${src.docs.cn}/build"/>

Modified: hadoop/common/trunk/ivy.xml
URL: http://svn.apache.org/viewvc/hadoop/common/trunk/ivy.xml?rev=824942&r1=824941&r2=824942&view=diff
==============================================================================
--- hadoop/common/trunk/ivy.xml (original)
+++ hadoop/common/trunk/ivy.xml Tue Oct 13 21:54:48 2009
@@ -285,6 +285,16 @@
       name="paranamer-ant"
       rev="${paranamer.version}"
       conf="common->default"/>
+    <dependency org="org.aspectj"
+      name="aspectjrt"
+      rev="${aspectj.version}"
+      conf="common->default">
+    </dependency>
+    <dependency org="org.aspectj"
+      name="aspectjtools"
+      rev="${aspectj.version}"
+      conf="common->default">
+    </dependency>
     </dependencies>
-  
+
 </ivy-module>

Modified: hadoop/common/trunk/ivy/libraries.properties
URL: http://svn.apache.org/viewvc/hadoop/common/trunk/ivy/libraries.properties?rev=824942&r1=824941&r2=824942&view=diff
==============================================================================
--- hadoop/common/trunk/ivy/libraries.properties (original)
+++ hadoop/common/trunk/ivy/libraries.properties Tue Oct 13 21:54:48 2009
@@ -77,3 +77,5 @@
 
 xmlenc.version=0.52
 xerces.version=1.4.4
+
+aspectj.version=1.6.4

Modified: hadoop/common/trunk/src/saveVersion.sh
URL: http://svn.apache.org/viewvc/hadoop/common/trunk/src/saveVersion.sh?rev=824942&r1=824941&r2=824942&view=diff
==============================================================================
--- hadoop/common/trunk/src/saveVersion.sh (original)
+++ hadoop/common/trunk/src/saveVersion.sh Tue Oct 13 21:54:48 2009
@@ -21,6 +21,7 @@
 unset LANG
 unset LC_CTYPE
 version=$1
+build_dir=$2
 user=`whoami`
 date=`date`
 cwd=`pwd`
@@ -43,12 +44,12 @@
 fi
 srcChecksum=`find src -name '*.java' | LC_ALL=C sort | xargs md5sum | md5sum | cut -d ' '
-f 1`
 
-mkdir -p build/src/org/apache/hadoop
+mkdir -p $build_dir/src/org/apache/hadoop
 cat << EOF | \
   sed -e "s/VERSION/$version/" -e "s/USER/$user/" -e "s/DATE/$date/" \
       -e "s|URL|$url|" -e "s/REV/$revision/" \
       -e "s|BRANCH|$branch|" -e "s/SRCCHECKSUM/$srcChecksum/" \
-      > build/src/org/apache/hadoop/package-info.java
+      > $build_dir/src/org/apache/hadoop/package-info.java
 /*
  * Generated by src/saveVersion.sh
  */

Added: hadoop/common/trunk/src/test/aop/build/aop.xml
URL: http://svn.apache.org/viewvc/hadoop/common/trunk/src/test/aop/build/aop.xml?rev=824942&view=auto
==============================================================================
--- hadoop/common/trunk/src/test/aop/build/aop.xml (added)
+++ hadoop/common/trunk/src/test/aop/build/aop.xml Tue Oct 13 21:54:48 2009
@@ -0,0 +1,115 @@
+<!--
+   Licensed to the Apache Software Foundation (ASF) under one or more
+   contributor license agreements.  See the NOTICE file distributed with
+   this work for additional information regarding copyright ownership.
+   The ASF licenses this file to You under the Apache License, Version 2.0
+   (the "License"); you may not use this file except in compliance with
+   the License.  You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+-->
+<project name="aspects">
+  <property name="build-fi.dir" value="${basedir}/build-fi"/>
+  <property name="hadoop-fi.jar" location="${build.dir}/${final.name}-fi.jar" />
+  <property name="aspectversion" value="1.6.4"/>
+  <property file="${basedir}/build.properties"/>
+
+  <!--All Fault Injection (FI) related targets are located in this session -->
+    
+  <target name="clean-fi">
+    <delete dir="${build-fi.dir}"/>
+  </target>
+  
+  <!-- Weaving aspects in place
+  	Later on one can run 'ant jar-fault-inject' to create
+  	Hadoop jar file with instrumented classes
+  -->
+  <target name="compile-fault-inject" 
+  	depends="compile-core-classes, compile-tests">
+    <!-- AspectJ task definition -->
+    <taskdef
+      resource="org/aspectj/tools/ant/taskdefs/aspectjTaskdefs.properties">
+      <classpath>
+        <pathelement 
+          location="${common.ivy.lib.dir}/aspectjtools-${aspectversion}.jar"/>
+      </classpath>
+    </taskdef>
+    <echo message="Start weaving aspects in place"/>
+    <iajc
+      encoding="${build.encoding}" 
+      srcdir="${java.src.dir};${build.src};${test.src.dir}/aop" 
+      includes="org/apache/hadoop/**/*.java, org/apache/hadoop/**/*.aj"
+      excludes="org/apache/hadoop/record/**/*"
+      destDir="${build.classes}"
+      debug="${javac.debug}"
+      target="${javac.version}"
+      source="${javac.version}"
+      deprecation="${javac.deprecation}">
+      <classpath refid="test.classpath"/>
+    </iajc>
+    <echo message="Weaving of aspects is finished"/>
+  </target>
+
+  <target name="injectfaults" 
+  	description="Instrument classes with faults and other AOP advices">
+    <subant buildpath="${basedir}" target="compile-fault-inject">
+      <property name="build.dir" value="${build-fi.dir}"/>
+    </subant>
+  </target>
+
+  <macrodef name="macro-run-tests-fault-inject">
+    <attribute name="target.name" />
+    <attribute name="testcasesonly" />
+    <sequential>
+      <subant buildpath="build.xml" target="@{target.name}">
+        <property name="build.dir" value="${build-fi.dir}"/>
+        <property name="test.fault.inject" value="yes"/>
+        <property name="test.include" value="TestFi*"/>
+        <!-- This one is needed for the special "regression" target only -->
+        <property name="special.fi.testcasesonly" value="@{testcasesonly}"/>
+      </subant>
+    </sequential>
+  </macrodef>
+	
+  <!-- ================================================================== -->
+  <!-- Make hadoop-fi.jar including all Fault injected artifacts         -->
+  <!-- ================================================================== -->
+  <macrodef name="macro-jar-fault-inject">
+    <attribute name="target.name" />
+    <attribute name="jar.final.name" />
+    <attribute name="jar.final.value" />
+    <sequential>
+      <subant buildpath="build.xml" target="@{target.name}">
+        <property name="build.dir" value="${build-fi.dir}"/>
+        <property name="@{jar.final.name}" value="@{jar.final.value}"/>
+        <property name="jar.extra.properties.list" 
+        	  value="${test.src.dir}/fi-site.xml" />
+      </subant>
+    </sequential>
+  </macrodef>
+
+  <!-- ================================================================== -->
+  <!-- Make test jar files including all Fault Injected artifacts         -->
+  <!-- ================================================================== -->
+
+  <macrodef name="macro-jar-test-fault-inject">
+    <attribute name="target.name" />
+    <attribute name="jar.final.name" />
+    <attribute name="jar.final.value" />
+    <sequential>
+      <subant buildpath="build.xml" target="@{target.name}">
+        <property name="build.dir" value="${build-fi.dir}"/>
+        <property name="@{jar.final.name}" 
+                  value="@{jar.final.value}"/>
+      </subant>
+    </sequential>
+  </macrodef>
+
+  <!--End of Fault Injection (FI) related session-->
+</project>

Added: hadoop/common/trunk/src/test/aop/org/apache/hadoop/fi/FiConfig.java
URL: http://svn.apache.org/viewvc/hadoop/common/trunk/src/test/aop/org/apache/hadoop/fi/FiConfig.java?rev=824942&view=auto
==============================================================================
--- hadoop/common/trunk/src/test/aop/org/apache/hadoop/fi/FiConfig.java (added)
+++ hadoop/common/trunk/src/test/aop/org/apache/hadoop/fi/FiConfig.java Tue Oct 13 21:54:48
2009
@@ -0,0 +1,50 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.hadoop.fi;
+
+import org.apache.hadoop.conf.Configuration;
+
+/**
+ * This class wraps the logic around fault injection configuration file
+ * Default file is expected to be found in src/test/fi-site.xml
+ * This default file should be copied by JUnit Ant's tasks to 
+ * build/test/extraconf folder before tests are ran
+ * An alternative location can be set through
+ *   -Dfi.config=<file_name>
+ */
+public class FiConfig {
+  private static final String CONFIG_PARAMETER = ProbabilityModel.FPROB_NAME + "config";
+  private static final String DEFAULT_CONFIG = "fi-site.xml";
+  private static Configuration conf;
+  static {
+    if (conf == null) {
+      conf = new Configuration(false);
+      String configName = System.getProperty(CONFIG_PARAMETER, DEFAULT_CONFIG);
+      conf.addResource(configName);
+    }
+  }
+  
+  /**
+   * Method provides access to local Configuration 
+   * 
+   * @return Configuration initialized with fault injection's parameters
+   */
+  public static Configuration getConfig() {
+    return conf;
+  }
+}

Added: hadoop/common/trunk/src/test/aop/org/apache/hadoop/fi/ProbabilityModel.java
URL: http://svn.apache.org/viewvc/hadoop/common/trunk/src/test/aop/org/apache/hadoop/fi/ProbabilityModel.java?rev=824942&view=auto
==============================================================================
--- hadoop/common/trunk/src/test/aop/org/apache/hadoop/fi/ProbabilityModel.java (added)
+++ hadoop/common/trunk/src/test/aop/org/apache/hadoop/fi/ProbabilityModel.java Tue Oct 13
21:54:48 2009
@@ -0,0 +1,106 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.hadoop.fi;
+
+import java.util.Random;
+
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+import org.apache.hadoop.conf.Configuration;
+
+/**
+ * This class is responsible for the decision of when a fault 
+ * has to be triggered within a class of Hadoop
+ * 
+ *  Default probability of injection is set to 0%. To change it
+ *  one can set the sys. prop. -Dfi.*=<new probability level>
+ *  Another way to do so is to set this level through FI config file,
+ *  located under src/test/fi-site.conf
+ *  
+ *  To change the level one has to specify the following sys,prop.:
+ *  -Dfi.<name of fault location>=<probability level> in the runtime
+ *  Probability level is specified by a float between 0.0 and 1.0
+ *  
+ *  <name of fault location> might be represented by a short classname
+ *  or otherwise. This decision is left up to the discretion of aspects
+ *  developer, but has to be consistent through the code 
+ */
+public class ProbabilityModel {
+  private static Random generator = new Random();
+  private static final Log LOG = LogFactory.getLog(ProbabilityModel.class);
+
+  static final String FPROB_NAME = "fi.";
+  private static final String ALL_PROBABILITIES = FPROB_NAME + "*";
+  private static final float DEFAULT_PROB = 0.00f; //Default probability is 0%
+  private static final float MAX_PROB = 1.00f; // Max probability is 100%
+
+  private static Configuration conf = FiConfig.getConfig();
+
+  static {
+    // Set new default probability if specified through a system.property
+    // If neither is specified set default probability to DEFAULT_PROB 
+    conf.set(ALL_PROBABILITIES, 
+        System.getProperty(ALL_PROBABILITIES, 
+            conf.get(ALL_PROBABILITIES, Float.toString(DEFAULT_PROB))));
+
+    LOG.info(ALL_PROBABILITIES + "=" + conf.get(ALL_PROBABILITIES));
+  }
+
+  /**
+   * Simplistic method to check if we have reached the point of injection
+   * @param klassName is the name of the probability level to check. 
+   *  If a configuration has been set for "fi.myClass" then you can check if the
+   *  inject criteria has been reached by calling this method with "myClass"
+   *  string as its parameter
+   * @return true if the probability threshold has been reached; false otherwise
+   */
+  public static boolean injectCriteria(String klassName) {
+    boolean trigger = false;
+    if (generator.nextFloat() < getProbability(klassName)) {
+      trigger = true;
+    }
+    return trigger;
+  }
+
+  /**
+   * This primitive checks for arbitrary set of desired probability. If the 
+   * level hasn't been set method will return default setting.
+   * The probability expected to be set as an float between 0.0 and 1.0
+   * @param klass is the name of the resource
+   * @return float representation of configured probability level of 
+   *  the requested resource or default value if hasn't been set
+   */
+  protected static float getProbability(final String klass) {
+    String newProbName = FPROB_NAME + klass;
+
+    String newValue = System.getProperty(newProbName, conf.get(ALL_PROBABILITIES));
+    if (newValue != null && !newValue.equals(conf.get(newProbName)))
+      conf.set(newProbName, newValue);
+
+    float ret = conf.getFloat(newProbName,
+        conf.getFloat(ALL_PROBABILITIES, DEFAULT_PROB));
+    LOG.debug("Request for " + newProbName + " returns=" + ret);
+    // Make sure that probability level is valid.
+    if (ret < DEFAULT_PROB || ret > MAX_PROB) {
+      LOG.info("Probability level is incorrect. Default value is set");
+      ret = conf.getFloat(ALL_PROBABILITIES, DEFAULT_PROB);
+    }
+    
+    return ret;
+  }
+}

Added: hadoop/common/trunk/src/test/fi-site.xml
URL: http://svn.apache.org/viewvc/hadoop/common/trunk/src/test/fi-site.xml?rev=824942&view=auto
==============================================================================
--- hadoop/common/trunk/src/test/fi-site.xml (added)
+++ hadoop/common/trunk/src/test/fi-site.xml Tue Oct 13 21:54:48 2009
@@ -0,0 +1,31 @@
+<?xml version="1.0"?>
+<!--
+   Licensed to the Apache Software Foundation (ASF) under one or more
+   contributor license agreements.  See the NOTICE file distributed with
+   this work for additional information regarding copyright ownership.
+   The ASF licenses this file to You under the Apache License, Version 2.0
+   (the "License"); you may not use this file except in compliance with
+   the License.  You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+-->
+<?xml-stylesheet type="text/xsl" href="configuration.xsl"?>
+
+<!-- Put fault injection specific property overrides in this file. -->
+
+<configuration>
+  <property>
+    <name>fi.*</name>
+    <value>0.00</value>
+    <description>
+    	Default probability level for all injected faults specified 
+    	as a floating number between 0 and 1.00
+    </description>
+  </property>
+</configuration>



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