Changes/Hadoop

Apache Hadoop 2.x

Summary

Provide native Apache Hadoop packages.

Owner

• Name: Matthew Farrellee
• Email: matt@fedoraproject.org
• Release notes owner:

Current status

• Targeted release: Fedora 20
• Last updated: 8 July 2013
• Tracker bug: <will be assigned by the Wrangler>

Detailed Description

Apache Hadoop is a widely used, increasingly complete big data platform, with a strong open source community and growing ecosystem. The goal is to package and integrate the core of the Hadoop ecosystem for Fedora, allowing for immediate use and creating a base for the rest of the ecosystem.

Benefit to Fedora

The Apache Hadoop software will be packaged and integrated with Fedora. The core of the Hadoop ecosystem will be available with Fedora and provide a base for additional packages.

Scope

• Proposal owners:
  • Note: target is Apache Hadoop 2.0.5-alpha
  • Package all dependencies needed for Apache Hadoop 2.x
  • Package the Apache Hadoop 2.x software

• Other developers: N/A (not a System Wide Change)

• Release engineering: N/A (not a System Wide Change)

• Policies and guidelines: N/A (not a System Wide Change)

Upgrade/compatibility impact

N/A (not a System Wide Change)

How To Test

1. Install the hadoop rpms with:
   • yum install hadoop-common hadoop-hdfs hadoop-libhdfs hadoop-mapreduce hadoop-mapreduce-examples hadoop-yarn
2. Start the cluster by issuing:
   • systemctl start hadoop-namenode hadoop-datanode hadoop-nodemanager hadoop-resourcemanager
3. Initialize the HDFS directories:
   • hdfs-create-dirs
4. Create a directory for the user running the tests:
   1. runuser hdfs -s /bin/bash /bin/bash -c "hadoop fs -mkdir /user/<name>"
   2. runuser hdfs -s /bin/bash /bin/bash -c "hadoop fs -chown <name> /user/<name>"
5. The user from the previous step can run jobs like the following mapreduce examples:
   • hadoop jar /usr/share/hadoop/mapreduce/hadoop-mapreduce-examples-2.0.5-alpha.jar pi 10 1000000
   • hadoop jar /usr/share/hadoop/mapreduce/hadoop-mapreduce-examples-2.0.5-alpha.jar randomwriter out
   • These three have an order they need to be run in:
     1. hadoop jar /usr/share/hadoop/mapreduce/hadoop-mapreduce-examples-2.0.5-alpha.jar teragen 100 gendata
     2. hadoop jar /usr/share/hadoop/mapreduce/hadoop-mapreduce-examples-2.0.5-alpha.jar terasort gendata 100
     3. hadoop jar /usr/share/hadoop/mapreduce/hadoop-mapreduce-examples-2.0.5-alpha.jar teravalidate gendata reportdata

User Experience

N/A (not a System Wide Change)

Dependencies

N/A (not a System Wide Change)

Contingency Plan

• Contingency mechanism: N/A (not a System Wide Change)
• Contingency deadline: N/A (not a System Wide Change)
• Blocks release? N/A (not a System Wide Change), Yes/No

Documentation

• http://wiki.apache.org/hadoop

Release Notes

• TODO

Effort details

People involved

Name	IRC	Focus	Additional
Matthew Farrellee	mattf	keeping track, integration testing	UTC-5
Peter MacKinnon	pmackinn	packaging, testing	UTC-5
Rob Rati	rsquared	packaging	UTC-5
Timothy St. Clair	tstclair	config, upstream tracking	UTC-6
Sam Kottler	skottler	packaging	UTC-5
Gil Cattaneo	gil	packaging	UTC+1
Christopher Meng	cicku	packaging, testing	UTC+8

Detailed status

• Last updated: 11 July 2013
• Percentage of completion
  • Dependencies available in Fedora (missing since project initiation): 100%
  • Adaptation of Hadoop 2.0.5a source via patches: 100%
  • Hadoop spec completion: 95%
• Test suite (Updated to 2.0.5a; all skips are from upstream)

Module	Tests	Failures	Errors	Skipped
hadoop-auth	48	0	0	0
hadoop-common	1828	1	0	6
hadoop-hdfs	1644	2	5	6
hadoop-hdfs-httpfs	283	0	0	0
hadoop-hdfs-bkjournal	31	0	1	0
hadoop-yarn-common	109	0	0	0
hadoop-yarn-client	17	0	0	0
hadoop-yarn-server-common	3	0	0	0
hadoop-yarn-server-nodemanager	153	0	1	0
hadoop-yarn-server-web-proxy	9	0	0	0
hadoop-yarn-server-resourcemanager	277	0	0	0
hadoop-yarn-server-tests	7	0	0	0
hadoop-yarn-applications-distributedshell	2	0	0	0
hadoop-yarn-applications-unmanaged-am-launcher	1	0	0	0
hadoop-mapreduce-examples	11	0	0	1
hadoop-mapreduce-client-core	56	0	0	0
hadoop-mapreduce-client-common	43	0	0	0
hadoop-mapreduce-client-shuffle	4	0	0	0
hadoop-mapreduce-client-app	210	2	0	0
hadoop-mapreduce-client-jobclient	443	0	3	12
hadoop-mapreduce-client-hs	128	2	0	0
hadoop-mapreduce-client-hs-plugins	1	0	0	0
hadoop-streaming	55	0	6	0
hadoop-distcp	112	0	0	0
hadoop-archives	2	0	0	0
hadoop-rumen	3	0	0	1
hadoop-gridmix	44	0	0	0
hadoop-datajoin	1	0	0	0
hadoop-extras	20	0	0	1

Approach

We are taking an iterative, depth-first approach to packaging. We do not have all the dependencies mapped out ahead of time. Dependencies are being tabulated into two groups:

1. missing - the dependency being requested from a hadoop-common pom has not yet been packaged, reviewed or generated into fedora repos
2. broken - the dependency requested is out of date with current fedora versions, and patches must be developed for inclusion in a hadoop rpm build that address any build, API or source code deltas

Note that a dependency may show up in both of these tables.

Anyone who wants to help should find an available dependency below, edit the table changing the state to Active and packager to yourself.

If you are lucky enough to pick a dependency that itself has unpackaged dependencies, identify the sub-dependencies and add them to the bottom of the Dependencies table below, change your current dependency to Blocked and repeat.

If your dependency is already packaged but the version is incompatible, contact the package owner and resolve the incompatibility in a mutually satisfactory way. For instance:

• If the version available in Fedora is older, explore updating the package. If that is not possible, explore creating a package that includes a version in its name, e.g. pkgnameXY. Ultimately, the most recent version in Fedora should have the name pkgname while older versions have pkgnameXY. It may take a full Fedora release to rationalize package names. Make a note in the Dependencies table.

• If the version you need is older than the packaged version, consider creating a patch to use the newer version. If a patch is not viable, proceed by packaging the dependency with a version in its name, e.g. pkgnameXY. Make a note in the Dependencies table.

There is tattletale dependency graph data for both the baseline branch and the fedora development branch.

Running and debugging the unit test suite is discussed in the test suite section below and results are maintained in the test suite results table.

You will run into situations where the Apache Hadoop source needs to be patched to handle the Fedora version of a dependency. Those patches are candidates to propose upstream, are tracked in the upstream patch tracking table, and maintained in the source repositories below. Any changes that are required to conform to Fedora's packaging guidelines or deal with a package naming issue should be contained to the hadoop spec file.

In handling patches, the intention of this process is to isolate changes to a single dependency so patches can be created that can be consumed upstream. It is important that changes to the source be isolated to 1 dependency and the changes must be self-contained. A dependency is not necessarily a single jar file. Changes to a dependency should entail everything needed to use the jar files from a later release of the dependency.

Source repositories:

• https://github.com/fedora-bigdata/hadoop-common Fork of Apache Hadoop for changes required to support compilation on Fedora
• https://github.com/fedora-bigdata/hadoop-rpm Spec and supporting files for generating an RPM for Fedora

Dependency Branches

All code/build changes to Apache Hadoop should be performed on a branch in the hadoop-common repo that should be based off the

branch-2.0.5-alpha

branch and should following this naming convention:

fedora-patch-<dependency>

Where <dependency> is the name of the dependency being worked on. Changes to this branch should ONLY relate to the dependency being worked on. Do not include the dependency version in the branch name. These branches will be updated as needed because of Fedora or Hadoop updates until they are accepted upstream by Apache Hadoop. Not having the dependency version allows the branch to move from version 1->2->3 without confusion if it is required before accepted upstream.

Integration Branch

An integration branch should be created in the hadoop-common repository that corresponds with the release version being packaged using the following naming convention:

fedora-<version>-integration

where <ver> is the hadoop version being packaged. All branches containing changes that have not yet been accepted upstream should be merged to the integration branch and the result should pass the build and all tests. Once this is complete a patch should be generated and pushed to the hadoop-rpm repository.

Test suite

In order to attempt to run any part of the test suite, you must first build the components (F18,F19):

1. git clone git://github.com/fedora-bigdata/hadoop-common.git
2. cd hadoop-common
3. git checkout -b fedora-2.0.5-alpha-test origin/fedora-2.0.5-alpha-test
4. mvn-rpmbuild -Pdist,native -DskipTest -DskipTests -DskipIT install

If you are interested in the whole ball of wax then

• mvn-rpmbuild -X -Dorg.apache.jasper.compiler.disablejsr199=true^[1] test

and go mow a football field or knit a sweater. Note that this could still result in spurious failures. Add -Dmaven.test.failure.ignore=true to the above line if you're seeking just test errors.

The fedora-2.0.5-alpha-test branch excludes identified consistently failing tests. You can edit your copy of hadoop-project/pom.xml to bring any of them back into play.

If you are interested in investigating specific failures such as active ones from the table above then target the module, test class, and even method as you see fit:

• mvn-rpmbuild -X -pl :hadoop-common test -Dtest=TestSSLHttpServer#testEcho

All your hard work results in a patch? Great! Hit a contributor up with it and we'll review and apply if everything looks cool.

This option is required to ensure the test of TestHttpServer#testContentTypes passes due to the use of glassfish JSP support.

Dependencies

Missing dependency legend

State	Notes
Available	free for someone to take
Active	dependency is actively being packaged if missing, or patch is being developed or tested for inclusion in hadoop-common build
Blocked	pending packages for dependencies
Review	under review, include link to review BZ
Complete	woohoo!

Missing Dependencies

Project	State	Review BZ	Packager	Notes
hadoop	Active		rrati,pmackinn
bookkeeper	Complete	RHBZ #948589	gil	Version 4.0 requested. packaged 4.2.1. Patch: BOOKKEEPER-598
glassfish-gmbal	Complete	RHBZ #859112	gil	F18 build
glassfish-management-api	Complete	RHBZ #859110	gil	F18 build
grizzly	Complete	RHBZ #859114	gil	Only for F20 for now. Cause: missing glassfish-servlet-api on F18 and F19.
groovy	Complete	RHBZ #858127	gil	1.5 requested but 1.8 packaged in fedora. Possible moving forward 1.8 series will be known as groovy18 and groovy will be 2.x.
jersey	Complete	RHBZ #825347	gil	F18 build Should be rebuilt with grizzly2 support enabled.
jets3t	Complete	RHBZ #847109	gil
jspc-compiler	Complete	RHBZ #960720	pmackinn	Passes preliminary overall hadoop-common compilation/testing.
kfs	Review	RHBZ #960728	pmackinn	kfs has become Quantcast qfs. No longer a dependency in 2.0.5-beta & >
maven-native	Complete	RHBZ #864084	gil	Needs patch to build with java7. NOTE: javac target/source is already set by mojo.java.target option
zookeeper	Complete	RHBZ #823122	gil	requires jtoaster

Broken Dependencies

Project	Packager	Notes
ant		Version 1.6 requested, 1.8 currently packaged in Fedora. Needs to be inspected for API/functional incompatibilities(?)
apache-commons-collections	pmackinn	Java import compilation error with existing package. Patches for hadoop-common being tracked at https://github.com/fedora-bigdata/hadoop-common/tree/fedora-patch-collections
apache-commons-math	pmackinn	Current apache-commons-math uses math3 in pom instead of math, and API changes in code. Patches for hadoop-common being tracked at https://github.com/fedora-bigdata/hadoop-common/tree/fedora-patch-math
cglib	pmackinn	Missing an explicit dep which old dep chain didn't need.. Patches for hadoop-common being tracked at https://github.com/fedora-bigdata/hadoop-common/tree/fedora-patch-cglib
ecj	rrati	Need ecj version ecj-4.2.1-6 or later to resolve a dependency lookup issue
gmaven	gil	Version 1.0 requested, available 1.4 (but has broken deps) RHBZ #914056
hadoop-hdfs	pmackinn	glibc link error in hdfs native build. Patch for hadoop-common being tracked at https://github.com/fedora-bigdata/hadoop-common/tree/fedora-patch-cmake-hdfs
hsqldb	tradej	1.8 in fedora, update to 2.2.9 in the process. API compatibility to be checked.
jersey	pmackinn	Needs jersey-servlet and version. Tracked at https://github.com/fedora-bigdata/hadoop-common/tree/fedora-patch-jersey
jets3t	pmackinn	Requires 0.6.1. With 0.9.x: hadoop-common Jets3tNativeFileSystemStore.java error: incompatible types S3ObjectsChunk chunk = s3Service.listObjectsChunked(bucket.getName(). Patches for hadoop-common being tracked at https://github.com/fedora-bigdata/hadoop-common/tree/fedora-patch-jets3t
jetty	rrati	jetty8 packaged in Fedora, but 6.x requested. 6 and 8 are incompatible. Patches tracked at https://github.com/fedora-bigdata/hadoop-common/tree/fedora-patch-jetty
slf4j	pmackinn	Package in fedora fails to match in dependency resolution. jcl104-over-slf4j dep in hadoop-common moved to jcl-over-slf4j as part of jspc/tomcat dep. Patch being tracked at https://github.com/fedora-bigdata/hadoop-common/tree/fedora-patch-jasper
tomcat-jasper	pmackinn	Version 5.5.x requested. Adaptations made for incumbent Tomcat 7 via patches at https://github.com/fedora-bigdata/hadoop-common/tree/fedora-patch-jasper. Reviewing fit as part of overall hadoop-common compilation/testing.

Test suite results

Unit Test Log (requires update for 2.0.5-alpha)

Module	Name	Baseline 2.0.2a/2.0.5a	Fedora 2.0.2a	Fedora 2.0.5a	Tester	Notes
hadoop-common	TestDoAsEffectiveUser	Pass	Fail	Pass	pmackinn	Failed in hadoop-common test suite but frequently succeeded as standalone. testRealUserSetup
hadoop-common	TestRPCCompatibility	Pass	Fail	Pass	pmackinn	Failed in hadoop-common test suite but frequently succeeded as standalone. testVersion2ClientVersion1Server: "expected:<3> but was:<-3>"
hadoop-common	TestSSLHttpServer	Pass	Fixed	Fixed	pmackinn	Required addition of SslContextFactory (new to Jetty 8+) setup in advance of SslConnector activation. Tracked here.
hadoop-hdfs	TestWebHdfsFileSystemContract	Pass	Fail	Pass	pmackinn	Spurious failures, infrequently reproducible.
hadoop-hdfs	TestDelegationTokenForProxyUser	Pass	Fail	Pass	pmackinn	testWebHdfsDoAs: "expected:<200> but was:<401>". Can no longer reproduce.
hadoop-hdfs	TestEditLogRace	Pass	Fail	Fail	pmackinn	testSaveRightBeforeSync
hadoop-hdfs	TestHftpURLTimeouts	Pass	Fail	Pass	pmackinn	testHsftpSocketTimeout -> intermittent test failure. Infrequently reproducible.
hadoop-hdfs	TestNameNodeMetrics	Fail	Fail	Pass	pmackinn	testCorruptBlock: Bad value for metric PendingReplicationBlocks expected:<0> but was:<1> in test suite. Was sporadic. Can no longer reproduce.
hadoop-hdfs	TestCheckpoint	Fail	Fail	Pass	pmackinn	testSecondaryHasVeryOutOfDateImage: Test resulted in an unexpected exit in test suite. Standalone OK. Can not reproduce.
hadoop-hdfs-bkjournal	TestBookKeeperJournalManager	Pass	Fixed	Fixed	pmackinn	testOneBookieFailure, testAllBookieFailure: BK 4.2 introduced "readonly" bookie which are enabled by default. This throws off test counts.
hadoop-hdfs-bkjournal	TestBookKeeperAsHASharedDir	Pass	Fixed	Fixed	pmackinn	See above re: readonly bookies.
hadoop-hdfs-bkjournal	TestBookKeeperHACheckpoints	Pass	Fail	Pass	pmackinn	testCheckpointWhenNoNewTransactionsHappened: Port in use: localhost:10001 (but not really). No longer reproducible.
hadoop-yarn-server-nodemanager	TestNMWebServices*	Pass	Fail	Review	pmackinn	All tests in error with java.lang.InstantiationException: something with the adaptation of GuiceServletConfig. Can be removed in test code and made to pass but would like deeper understanding of failure. Fedora test-only fix tracked here.
hadoop-yarn-server-nodemanager	TestNMWebServicesApps,Containers	Pass	Fail	Fixed	pmackinn	JSON assert logic needed fixing for new version of jettison. Tracked here.
hadoop-yarn-server-resourcemanager	TestRMWebServices*	Pass	Fail	Review	pmackinn	All tests in error with java.lang.InstantiationException on GuiceServletConfig: same guice-servlet problem as noted previously.
hadoop-yarn-server-resourcemanager	TestRMWebServicesApps,Nodes	Pass	Fail	Fixed	pmackinn	JSON assert logic needed fixing for new version of jettison. Tracked here.
hadoop-yarn-server-resourcemanager	TestDelegationTokenRenewer	Pass	Fail	Pass	pmackinn	Was testDTRenewalWithNoCancel: renew wasn't called as many times as expected expected:<1> but was:<2>. No longer reproducible.
hadoop-yarn-server-resourcemanager	TestApplicationTokens	Pass	Fail	Pass	pmackinn	Was testTokenExpiry: sporadic NPE. No longer reproducible.
hadoop-yarn-server-resourcemanager	TestAppManager	Pass	Fail	Pass	pmackinn	Was testRMAppSubmit,testRMAppSubmitWithQueueAndName: app event type is wrong before expected:<KILL> but was:<APP_REJECTED>; sporadic. No longer reproducible.
hadoop-yarn-client	TestYarnClient	Fail	Fail	Pass	pmackinn	Was testClientStop: Can only configure with YarnConfiguration. No longer reproducible.
hadoop-yarn-applications-unmanaged-am-launcher	TestUnmanagedAMLauncher	Fail	Fail	Pass	pmackinn	Seemed designed to execute once by successfully contacting an RM but repeatedly retries with: yarnAppState=FAILED, distributedFinalState=FAILED. No longer reproducible.
hadoop-mapreduce-client-app	TestAMWebServices*	Pass	Fail	Review	pmackinn	All tests in error with java.lang.InstantiationException on GuiceServletConfig: same guice-servlet problem as noted previously.
hadoop-mapreduce-client-hs	TestHsWebServices*	Pass	Fail	Review	pmackinn	All tests in error with java.lang.InstantiationException on GuiceServletConfig: same guice-servlet problem as noted previously.
hadoop-mapreduce-client-jobclient	TestMiniMRProxyUser	Pass	Fail	Pass	pmackinn	Was testValidProxyUser: assert fail. No longer reproducible.
hadoop-mapreduce-client-jobclient	TestMRJobs	Pass	Fail	Pass	pmackinn	Was testDistributedCache: assert fail. No longer reproducible.
hadoop-mapreduce-client-jobclient	TestMapReduceLazyOutput	Pass	Fail	Fail	pmackinn	testLazyOutput: assert fail
hadoop-mapreduce-client-jobclient	TestEncryptedShuffle	Pass	Fail	Pass	pmackinn	Was encryptedShuffleWithClientCerts,encryptedShuffleWithoutClientCerts: assert fail. No longer reproducible.
hadoop-mapreduce-client-jobclient	TestJobName	Pass	Fail	Pass	pmackinn	Was testComplexName,testComplexNameWithRegex: Job failed! No longer reproducible.
hadoop-mapreduce-client-jobclient	TestJobSysDirWithDFS	Pass	Fail	Fail	pmackinn	testWithDFS: Job failed!
hadoop-mapreduce-client-jobclient	TestClusterMapReduceTestCase	Pass	Fail	Pass	pmackinn	Was testMapReduce,testMapReduceRestarting: Job failed! No longer reproducible.
hadoop-mapreduce-client-jobclient	TestLazyOutput	Pass	Fail	Fail	pmackinn	testLazyOutput: Job failed!
hadoop-mapreduce-client-jobclient	TestMiniMRWithDFSWithDistinctUsers	Pass	Fail	Fail	pmackinn	testDistinctUsers: Job failed!. Fails more often than passes.
hadoop-mapreduce-client-jobclient	TestRMNMInfo	Pass	Fail	Pass	pmackinn	testRMNMInfoMissmatch:
hadoop-mapreduce-client-hs	TestJobHistoryParsing	Pass	Fail	Fail	pmackinn	testCountersForFailedTask: sporadic failures using OJ7, none with Oracle 1.6. Appears to be thread related, a task is assumed as killed with no counters based on having a null status.
hadoop-distcp	TestCopyCommitter	Pass	Fail	Pass	pmackinn	Was testNoCommitAction: Commit failed. No longer reproducible.

Tests are listed in the order of execution
Baseline: F18, maven 3.0.5, Oracle JDK 1.6u45

Upstream patch tracking

Currenly tracking against branch-2 @ https://github.com/timothysc/hadoop-common

Modification Tracking

Branch	Commiter	JIRA	Target	Status
fedora-patch-math	pmackinn	https://issues.apache.org/jira/browse/HADOOP-9594	2.1.0-beta	PENDING REVIEW
fedora-patch-junit	pmackinn	https://issues.apache.org/jira/browse/HADOOP-9605	2.0.5-alpha	COMMITTED
fedora-patch-javadocs	rsquared	https://issues.apache.org/jira/browse/HADOOP-9607	2.0.5-alpha	COMMITTED
fedora-patch-collections	pmackinn	https://issues.apache.org/jira/browse/HADOOP-9610	2.1.0-beta	PENDING REVIEW
fedora-patch-cglib	pmackinn	https://issues.apache.org/jira/browse/HADOOP-9611	2.1.0-beta	PENDING REVIEW
fedora-patch-jersey	pmackinn	https://issues.apache.org/jira/browse/HADOOP-9613	2.1.0-beta	PENDING REVIEW
fedora-patch-jets3t	pmackinn	https://issues.apache.org/jira/browse/HADOOP-9623 https://issues.apache.org/jira/browse/HADOOP-9680	2.1.0-beta	PENDING REVIEW
fedora-patch-jetty	pmackinn	https://issues.apache.org/jira/browse/HADOOP-9650	2.1.0-beta	RE-EVAL DUE TO F19 jetty-9
fedora-patch-jasper	pmackinn	https://lists.fedoraproject.org/pipermail/bigdata/2013-June/000026.html	N/A	Carrying Patch Until Further Notice
fedora-patch-cmake-hdfs	pmackinn	N/A	2.0.5-alpha	Already Modified Upstream

Packager Resources

Packager tips

• mvn-rpmbuild utility will ONLY resolve from system repo
• mvn-local will resolve from system repo first then fallback to maven if unresolved
  • can be used to find the delta between system repo packages available and missing dependencies that can be viewed in the .m2 local maven repo (find ~/.m2/repository -name '*.jar')
• -Dmaven.local.debug=true
  • reveals how JPP lookups are executed per dependency: useful for finding groupId,artifactId mismatches
• -Dmaven.test.skip=true
  • tells maven to skip test runs AND compilation
  • useful for unblocking end-to-end build

An alternative to gmaven:

• apply a patch with the following content where required
• test support is not guaranteed, should not work.

     <plugin>
       <groupId>org.apache.maven.plugins</groupId>
       <artifactId>maven-antrun-plugin</artifactId>
       <version>1.7</version>
       <dependencies>
         <dependency>
           <groupId>org.codehaus.groovy</groupId>
           <artifactId>groovy</artifactId>
           <version>any</version>
         </dependency>
         <dependency>
           <groupId>antlr</groupId>
           <artifactId>antlr</artifactId>
           <version>any</version>
         </dependency>
         <dependency>
           <groupId>commons-cli</groupId>
           <artifactId>commons-cli</artifactId>
           <version>any</version>
         </dependency>
         <dependency>
           <groupId>asm</groupId>
           <artifactId>asm-all</artifactId>
           <version>any</version>
         </dependency>
         <dependency>
           <groupId>org.slf4j</groupId>
           <artifactId>slf4j-nop</artifactId>
           <version>any</version>
         </dependency>
       </dependencies>
       <executions>
         <execution>
           <id>compile</id>
           <phase>process-sources</phase>
           <configuration>
             <target>
               <mkdir dir="${basedir}/target/classes"/>
               <taskdef name="groovyc" classname="org.codehaus.groovy.ant.Groovyc">
                 <classpath refid="maven.plugin.classpath"/>
               </taskdef>
               <groovyc destdir="${project.build.outputDirectory}" srcdir="${basedir}/src/main" classpathref="maven.compile.classpath">
                 <javac source="1.5" target="1.5" debug="on"/>
               </groovyc>
             </target>
           </configuration>
           <goals>
             <goal>run</goal>
           </goals>
         </execution>
       </executions>
     </plugin>

YUM repositories

An RPM repository of dependencies already packaged and in, or heading towards, review state can be found here:

http://repos.fedorapeople.org/repos/rrati/hadoop/

Currently, only Fedora 18 x86_64 packages are available