Hbase - Important thing

# When you execute a client App on Tomcat,  If you faced the following the error,
→Will not attempt to authenticate using SASL (unknown error)
# You add host's name in the hosts file. this is sample.
17x.2x.xxx.xx1   master01
17x.2x.xxx.xx2   slave02
17x.2x.xxx.xx3   slave03
17x.2x.xxx.xx4   slave04
# A client App(Hbase) on Tomcat is related with all of hbase server host name.

Hadoop - exclude a node on ruuning server

■dfs.hosts.exclude:
Names a file that contains a list of hosts that are not permitted to connect to the namenode. The full pathname of the file must be specified. If the value is empty, no hosts are excluded.

# Add below this to hdfs-site.xml
       <property>
              <name>dfs.hosts.exclude</name>
              <value>/home/hadoop/hadoop/conf/excludes</value>
      </property>

■mapred.hosts.exclude
Names a file that contains the list of hosts that should be excluded by the jobtracker. If the value is empty, no hosts are excluded. # Add below this to mapred-site.xml
    <property>
        <name>mapred.hosts.exclude</name>
        <value>/home/hadoop/hadoop/conf/excludes</value>
    </property>

# Excute
$ bin/hadoop dfsadmin -refreshNodes

# Excute Banlancer to banlanc for data
bin/hadoop balancer

Hbase - Connection Pool

-------------------------------------------------------------------------
# You need to set ips in the hosts file.
    <hbase>
        <master>server1:6000</master>
        <zookeeper>
            <quorum>server1</quorum>
            <property>
                <clientPort>2181</clientPort>
            </property>
        </zookeeper>
    </hbase>

Flume - flume-env.sh

JAVA_HOME=/usr/local/java

FLUME_CLASSPATH="/home/hadoop/flume/lib"

Git - Push to remote And Delete a branch

# Push origin branch, not upstream
$ git push orign service_branch

@ Delete a local branch, on the master branch.
$ git branch -d branch_name

@ If you get a error like this, but if you change the branch to master, and then
@ commend git branch -d branch_name on the prompt.
@---------------------------------------------------
@error: The branch 'branch_name' is not fully merged.
@If you are sure you want to delete it, run 'git branch -D branch_name'.
@---------------------------------------------------
$ git branch -D dev

@ Delete a remote branch
$ git push origin --delete dev

@ Make a branch in Local
$ git checkout -b branch_name

@ Make a branch in Remote
$ git push origin branch_name

@ You can not delete branches showing list
git branch --no-merged

Troubleshooting - hadoop

#   ipc.Client: Retrying connect to server: localhost/127.0.0.1:9000.
# You'd better check your hosts file
http://gh0stsp1der.tistory.com/66

# Hbase
#Unable to find region for 99999999999999 after 10 tries
http://nosql.rishabhagrawal.com/2013/04/hbase-orgapachehadoophbaseclientnoserve.html

Spring - Spring3 connect to Mybatis on spring-mybatis.

// A part of ServiceImpl.javaList<HadoopGameModel> hadoopGameList = slaveAdminDao.getMapper(SlaveDao.class).selectGameList(mapSelectGameList);

Git - Let's Fork the project

$ #Fork the "project-name" repository
$ git clone git@github.com:njoon/project-name.git
$ cd project-name/
$ git remote add upstream git@github.com:organizations/project-name.git
$ git fetch upstream

@If you want to remove the upstream
$ git remote remove upstream
----------------------------------------------------------------------------------------------

# If you want to merge from original branch(not forked master)
$ git fetch upstream

# To merge its changes into our local branch.
$ git branch -va
$ git checkout master
$ git merge upstream/master
# And you'd better use the Pull Request.


https://help.github.com/articles/syncing-a-fork