easyhadoop heapsize 113.81
easyhadoop heapsize 113.81
hadoop:1.2.1 ,easyhadoop:1.2.1 , centos:6.4 。
在使用easyhadoop的时候按照http://blog.csdn.net/fansy1990/article/details/12839441这篇文章的配置会出现集群的heapsize是113.81MB的情况,而且修改hadoop-env.sh中的export HADOOP_HEAPSIZE=1000没有作用。在50070界面看到的cluster summary如下所示:
2651 files and directories, 1117 blocks = 3768 total. Heap Size is 72.88 MB / 113.81 MB (64%)使用 hadoop heapsize 113.81作为关键字google,可以看到这样的一篇文章http://grokbase.com/t/cloudera/cdh-user/1358wy4708/heapsize-of-namenode-and-mapreduce,这篇文章也是这个问题。上面分析了多种配置情况,最后算是解决了这个问题。
其实,在easyhadoop配置的时候,需要配置hadoop-env.sh文件,笔者当时是从一个地方拷贝的hadoop-evn.sh文件然后直接粘贴的。按照hadoop1.2.1原版的hadoop-env.sh文件如下所示:
# Set Hadoop-specific environment variables here. # The only required environment variable is JAVA_HOME. All others are # optional. When running a distributed configuration it is best to # set JAVA_HOME in this file, so that it is correctly defined on # remote nodes. # The java implementation to use. Required. # export JAVA_HOME=/usr/lib/j2sdk1.5-sun # Extra Java CLASSPATH elements. Optional. # export HADOOP_CLASSPATH= # The maximum amount of heap to use, in MB. Default is 1000. # export HADOOP_HEAPSIZE=2000 # Extra Java runtime options. Empty by default. # export HADOOP_OPTS=-server # Command specific options appended to HADOOP_OPTS when specified export HADOOP_NAMENODE_OPTS="-Dcom.sun.management.jmxremote $HADOOP_NAMENODE_OPTS" export HADOOP_SECONDARYNAMENODE_OPTS="-Dcom.sun.management.jmxremote $HADOOP_SECONDARYNAMENODE_OPTS" export HADOOP_DATANODE_OPTS="-Dcom.sun.management.jmxremote $HADOOP_DATANODE_OPTS" export HADOOP_BALANCER_OPTS="-Dcom.sun.management.jmxremote $HADOOP_BALANCER_OPTS" export HADOOP_JOBTRACKER_OPTS="-Dcom.sun.management.jmxremote $HADOOP_JOBTRACKER_OPTS" # export HADOOP_TASKTRACKER_OPTS= # The following applies to multiple commands (fs, dfs, fsck, distcp etc) # export HADOOP_CLIENT_OPTS # Extra ssh options. Empty by default. # export HADOOP_SSH_OPTS="-o ConnectTimeout=1 -o SendEnv=HADOOP_CONF_DIR" # Where log files are stored. $HADOOP_HOME/logs by default. # export HADOOP_LOG_DIR=${HADOOP_HOME}/logs # File naming remote slave hosts. $HADOOP_HOME/conf/slaves by default. # export HADOOP_SLAVES=${HADOOP_HOME}/conf/slaves # host:path where hadoop code should be rsync'd from. Unset by default. # export HADOOP_MASTER=master:/home/$USER/src/hadoop # Seconds to sleep between slave commands. Unset by default. This # can be useful in large clusters, where, e.g., slave rsyncs can # otherwise arrive faster than the master can service them. # export HADOOP_SLAVE_SLEEP=0.1 # The directory where pid files are stored. /tmp by default. # NOTE: this should be set to a directory that can only be written to by # the users that are going to run the hadoop daemons. Otherwise there is # the potential for a symlink attack. # export HADOOP_PID_DIR=/var/hadoop/pids # A string representing this instance of hadoop. $USER by default. # export HADOOP_IDENT_STRING=$USER # The scheduling priority for daemon processes. See 'man nice'. # export HADOOP_NICENESS=10对比发现其不同的地方基本在于:
# Command specific options appended to HADOOP_OPTS when specified export HADOOP_NAMENODE_OPTS="-Dcom.sun.management.jmxremote $HADOOP_NAMENODE_OPTS" export HADOOP_SECONDARYNAMENODE_OPTS="-Dcom.sun.management.jmxremote $HADOOP_SECONDARYNAMENODE_OPTS" export HADOOP_DATANODE_OPTS="-Dcom.sun.management.jmxremote $HADOOP_DATANODE_OPTS" export HADOOP_BALANCER_OPTS="-Dcom.sun.management.jmxremote $HADOOP_BALANCER_OPTS" export HADOOP_JOBTRACKER_OPTS="-Dcom.sun.management.jmxremote $HADOOP_JOBTRACKER_OPTS"
完整版本如下:
# Set Hadoop-specific environment variables here. # The only required environment variable is JAVA_HOME. All others are # optional. When running a distributed configuration it is best to # set JAVA_HOME in this file, so that it is correctly defined on # remote nodes. # The java implementation to use. export JAVA_HOME=/usr/java/default export HADOOP_C # The maximum amount of heap to use, in MB. Default is 1000. #export HADOOP_HEAPSIZE= #export HADOOP_NAMENODE_INIT_HEAPSIZE="" # Extra Java runtime options. Empty by default. #export HADOOP_OPTS="-Djava.net.preferIPv4Stack=true $HADOOP_CLIENT_OPTS" # Command specific options appended to HADOOP_OPTS when specified expor tHADOOP_SEC export HADOOP_NAMENODE_OPTS="-Dcom.sun.management.jmxremote $HADOOP_NAMENODE_OPTS" export HADOOP_SECONDARYNAMENODE_OPTS="-Dcom.sun.management.jmxremote $HADOOP_SECONDARYNAMENODE_OPTS" export HADOOP_DATANODE_OPTS="-Dcom.sun.management.jmxremote $HADOOP_DATANODE_OPTS" export HADOOP_BALANCER_OPTS="-Dcom.sun.management.jmxremote $HADOOP_BALANCER_OPTS" export HADOOP_JOBTRACKER_OPTS="-Dcom.sun.management.jmxremote $HADOOP_JOBTRACKER_OPTS" # The following applies to multiple commands (fs, dfs, fsck, distcp etc) export HADOOP_CLIENT_OPTS="-Xmx256m $HADOOP_CLIENT_OPTS" #HADOOP_JAVA_PLATFORM_OPTS="-XX:-UsePerfData $HADOOP_JAVA_PLATFORM_OPTS" # On secure datanodes, user to run the datanode as after dropping privileges export HADOOP_SECURE_DN_USER= # Where log files are stored. $HADOOP_HOME/logs by default. export HADOOP_LOG_DIR=/var/log/hadoop/$USER # Where log files are stored in the secure data environment. export HADOOP_SECURE_DN_LOG_DIR=/var/log/hadoop/
修改后,配置按照默认情况,在50070界面看到cluster summary如下:
2651 files and directories, 1117 blocks = 3768 total. Heap Size is 103 MB / 888.94 MB (11%)这个是按照默认heapsize为1000的情况,修改hadoop-env.sh中的HADOOP_HEAPSIZE为500,可以看到cluster summary如下:
2651 files and directories, 1117 blocks = 3768 total. Heap Size is 72.88 MB / 444.5 MB (16%) 500说明修改heapsize可以修改集群的heapsize了。
在上面提到的一篇国外的链接中,讨论了heapsize的 两个值到底代表什么意思。最后一个代表最大的heapsize,但是/前面的值代表什么意思?在集群运行Job的时候这个值也没有改变,这点在国外的链接中也没有给出详细介绍。
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