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apollo's Introduction

分布式系统比普通程序开发有一些特别的难度,最主要的就是环境问题。本博客将记录怎么去解决这些问题,最主要的是一些脚本。后期会连续更新,目前最主要的技巧有:

ssh打通:hadoop在部署的时候,各个机器之间肯定要打通,我们不可能手工去敲每一个命令。所以最好有一个脚本。https://github.com/lwwcl1314/apollo/blob/master/distrubutescript/bin/pubkey.sh 此为我一个同事写的脚本。
远程执行:我们往往在修改了一些配置、命令后,需要同步到各个自己上面,此时就需要远程执行。一般就是 ssh h2 “command”,如果同步多个文件最好是这么书写,如:https://github.com/lwwcl1314/apollo/blob/master/distrubutescript/bin/syncresource.sh 如果弄成多线程的,可以https://github.com/lwwcl1314/apollo/blob/master/distrubutescript/bin/remotecommand.sh 此为我网上找的。
debug,我们一般需要在一些守护进程上面加上调试端口,如:
elif [ "$COMMAND" = "resourcemanager" ] ; then
  CLASSPATH=${CLASSPATH}:$YARN_CONF_DIR/rm-config/log4j.properties
  CLASS='org.apache.hadoop.yarn.server.resourcemanager.ResourceManager'
  YARN_OPTS="$YARN_OPTS $YARN_RESOURCEMANAGER_OPTS"
  YARN_OPTS="$YARN_OPTS -Xdebug -Xrunjdwp:transport=dt_socket,address=1314,server=y,suspend=n"
AM需要在配置文件mapred-site.xml配置:

<property>
  <name>yarn.app.mapreduce.am.command-opts</name>
  <value>-Xmx1000m -Xdebug -Xrunjdwp:transport=dt_socket,address=5555,server=y,suspend=n</value>
</property>
以前的版本对于child是配置:

 <property>
 924   <name>mapred.child.java.opts</name>
 925   <value>-Xmx2000mM<!-- Xdebug -Xrunjdwp:transport=dt_socket,address=6666,server=y,suspend=y--></value>
 926   <description>Java opts for the task tracker child processes.
 927   The following symbol, if present, will be interpolated: @taskid@ is replaced
 928   by current TaskID. Any other occurrences of '@' will go unchanged.
 929   For example, to enable verbose gc logging to a file named for the taskid in
 930   /tmp and to set the heap maximum to be a gigabyte, pass a 'value' of:
 931         -Xmx1024m -verbose:gc -Xloggc:/tmp/@[email protected]
 932
 933   The configuration variable mapred.child.ulimit can be used to control the
 934   maximum virtual memory of the child processes.
 935   </description>
 936 </property>
yarn版本控制container的参数比较多:分admin、user,user可以覆盖admin的;把map、reduce分开。参数有:mapreduce.map.java.opts、mapreduce.admin.map.child.java.opts、mapreduce.reduce.java.opts、mapreduce.admin.reduce.child.java.opts。

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