Cassandra升级脚本（http://www.yangbajing.me/2016/03/07/cassandra升级更新/）

cassandra_upgrading.sh

#!/bin/sh
# 升级cassandra脚本，假定cassandra安装目录在：/opt，待安装tarball文件在 ~/ 用户主目录

OLD_CASSANDRA=dsc-cassandra-2.2.4
CASSANDRA=dsc-cassandra-2.2.5

cd /opt
if [ ! -d "archive" ]; then
  sudo mkdir archive
fi

# 解压、设置
sudo tar zxf ~/$CASSANDRA-bin.tar.gz
sudo chown -R cassandra:root $CASSANDRA
sudo cp -f $OLD_CASSANDRA/bin/cassandra.in.sh $CASSANDRA/bin/
sudo cp -f $OLD_CASSANDRA/conf/cassandra-env.sh $CASSANDRA/conf/
sudo cp -f $OLD_CASSANDRA/conf/cassandra.yaml $CASSANDRA/conf/
sudo cp -f $OLD_CASSANDRA/conf/cassandra-rackdc.properties $CASSANDRA/conf/
sudo cp -f $OLD_CASSANDRA/conf/cassandra-topology.properties $CASSANDRA/conf/

# 创建快照
sudo -u cassandra cassandra/bin/nodetool snapshot crawler_spider -t snapshot_`date "+%Y-%m-%d"`
sudo -u cassandra cassandra/bin/nodetool snapshot crawler -t snapshot_`date "+%Y-%m-%d"`

# 停止服务
sudo -u cassandra cassandra/bin/nodetool drain
sudo -u cassandra cassandra/bin/nodetool stopdaemon

# 设置新的cassandra
sudo rm cassandra
sudo ln -sf $CASSANDRA cassandra
sudo mv $OLD_CASSANDRA archive/

# 启动新服务
sudo -u cassandra cassandra/bin/cassandra

# 更新 sstables
# sudo -u cassandra cassandra/bin/nodetool upgradesstables