内存问题

1、清理cache

• 清理前内存使用情况

free -m

• 开始清理

echo 1 > /proc/sys/vm/drop_caches

• 清理后内存使用情况

  free -m
  

  2、修改ElasticSearch内存

• 修改~/.bashrc文件

[itsm@t0-tkpol-elasticsearch-01 ~]$ cat .bashrc
.bashrc

Source global definitions
if [ -f /etc/bashrc ]; then
        . /etc/bashrc
fi

User specific aliases and functions
JAVA_HOME=/opt/jdk1.8.0_60/jre
export JAVA_HOME
PATH=$PATH:/opt/jdk1.8.0_60/jre/bin:/opt/elasticsearch-2.3.3/bin
export PATH
export CLASSPATH=.:$JAVA_HOME/lib/tools.jar:$JAVA_HOME/lib/dt.jar:$CLASSPATH
export ES_HEAP_SIZE=8g

• 具体添加内容

  export ES_HEAP_SIZE=8g
  

• 刷新环境变量

source .bashrc

• 验证是否生效

[itsm@t0-tkpol-elasticsearch-01 ~]$ ps -aux|grep elasticsearch
Warning: bad syntax, perhaps a bogus '-'? See /usr/share/doc/procps-3.2.8/FAQ
itsm     17550  9.1 13.2 16822508 2168616 pts/0 Sl  11:09   4:04 /opt/jdk1.8.0_60/jre/bin/java -Xms8g -Xmx8g -Djava.awt.headless=true -XX:+UseParNewGC -XX:+UseConcMarkSweepGC -XX:CMSInitiatingOccupancyFraction=75 -XX:+UseCMSInitiatingOccupancyOnly -XX:+HeapDumpOnOutOfMemoryError -XX:+DisableExplicitGC -Dfile.encoding=UTF-8 -Djna.nosys=true -Des.path.home=/opt/elasticsearch-2.3.3 -cp /opt/elasticsearch-2.3.3/lib/elasticsearch-2.3.3.jar:/opt/elasticsearch-2.3.3/lib/* org.elasticsearch.bootstrap.Elasticsearch start
itsm     19062  0.0  0.0 103304   876 pts/0    R+   11:54   0:00 grep elasticsearch