1. You are currently running the HMaster without HDFS append support enabled. This may result in data loss. Please see the HBase wiki for details.

1. grid@master1:/usr/local/hadoop$ sudo apt-get install -y git

1. grid@master1:/usr/local/hadoop$ git clone http://git.apache.org/hadoop-common.git
   
2. Cloning into 'hadoop-common'...
   
3. Checking connectivity... done.
   
4. grid@master1:/usr/local/hadoop$ cd hadoop-common/

1. grid@master1:/usr/local/hadoop/hadoop-common$ git checkout -t origin/branch-0.20-append
   
2. Branch branch-0.20-append set up to track remote branch branch-0.20-append from origin.
   
3. Switched to a new branch 'branch-0.20-append'
4. 
   
5. grid@master1:/usr/local/hadoop/hadoop-common$ git show-branch release-0.20.2 branch-0.20-append
   
6. ! [release-0.20.2] Hadoop 0.20.2 release
   
7.  * [branch-0.20-append] HDFS-1779. After NameNode restart , Clients can not read partial files even after client invokes Sync. Contributed by Uma Maheswara Rao G.
   
8. --
   
9.  * [branch-0.20-append] HDFS-1779. After NameNode restart , Clients can not read partial files even after client invokes Sync. Contributed by Uma Maheswara Rao G.
   
10. ....................
    
11. ...................

1. grid@master1:/usr/local/hadoop/hadoop-common$ vi ../build.properties
   
2. 
   
3. resolvers=internal
   
4. version=0.20-append-for-hbase
   
5. project.version=${version}
   
6. hadoop.version=${version}
   
7. hadoop-core.version=${version}
   
8. hadoop-hdfs.version=${version}
   
9. hadoop-mapred.version=${version}

grid@master1:/usr/local/hadoop/hadoop-common$ ln -s ../build.properties build.properties

1. grid@master1:/usr/local/hadoop/hadoop-common$ sudo apt-get install -y ant

1. grid@master1:/usr/local/hadoop/hadoop-common$ ant mvn-install
2. .....................................
   

 BUILD SUCCESSFUL
 Total time: 2 minutes 18 seconds

1. ant test
   
2. ant test-core

1. grid@master1:/usr/local/hadoop$ mv hadoop-0.20.2-core.jar hadoop-0.20.2-core.jar.bak
   
2. 
   
3. grid@master1:/usr/local/hadoop$ cp hadoop-common/build/hadoop-core-0.20-append-for-hbase.jar hadoop-0.20-append-for-hbase-core.jar

1. grid@master1:/usr/local/hbase/lib$ mv hadoop-0.20.2-core.jar hadoop-0.20.2-core.jar.bak
   
2. 
   
3. grid@master1:/usr/local/hadoop/hadoop-common/build$ cp hadoop-core-0.20-append-for-hbase.jar /usr/local/hbase/lib/