Category: Life

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hdfs dfs -ls /user/hdfs/dw/raw/tracking/2017/06/15/tracking_16.gz

获取文件到当前目录

hdfs dfs -get /user/hdfs/dw/raw/tracking/2017/06/16/tracking_0.gz

放置当前目录文件到 hdfs 里

hdfs dfs -put * /user/hdfs/reporting/thread/2017/06/22/

查看 gz 文件

hdfs dfs -cat /user/hdfs/dw/raw/tracking/2017/06/16/tracking_0.gz  | zcat

查看状态

bin/nodetool status

查看所有的 keyspaces

DESCRIBE KEYSPACES

查看网络状态

bin/nodetool netstats

查看 gossipinfo

bin/nodetool gossipinfo

修改 replication factor 之后进行 repair

bin/nodetool repair

踢除一个活的节点

bin/nodetool decommision

导出一个 keyspace 的结构

cqlsh -e "DESC KEYSPACE test" > db_schema_test.cql;

导出所有 keyspace 的结构

cqlsh -e "DESC SCHEMA" > db_schema.cql

导出表至 csv 文件

COPY table_name ( column , ... )
TO  'file_name' | STDOUT 
WITH option = 'value' AND ...

当需要维护一个结点时

cd /opt/platform/cassandra/
bin/nodetool drain
# stop
pgrep -u ops -f cassandra | xargs kill -9

# start
nohup ./bin/cassandra &

变更后 Check
/opt/platform/cassandra/bin/nodetool status
关注

Status – U (up) or D (down)
Indicates whether the node is functioning or not.

State – N (normal), L (leaving), J (joining), M (moving)
The state of the node in relation to the cluster.

荒野虽险，身体+头脑依然能够生存，在社会上行走，也是行走在荒野

Survival can be summed up in three words – never give up. That’s the heart of it really. Just keep trying.
The line between life or death is determined by what we are willing to do.
If you risk nothing you gain nothing
If you can find a path with no obstacles, it probably doesn’t lead anywhere.
There is little faith involved in setting out on a journey where the destination is certain and every step in between has been mapped in detail. Bravery, trust, is about leaving camp in the dark, when we do not know the route ahead and cannot be certain we will ever return.
When you find yourself thinking about someone or something in the same old negative way, just stop yourself. Think. Check. Change. Refresh. Job done. Smile. Move on. Do this enough times and you will change. For the better; for the stronger.
And if you give your heart to a goal, it will repay you. It’s the law of the universe.
Stick to the fight when you’re hardest hit, It’s when things seem worst that you must not quit.
There is no education like adversity.
Tentative is no power.

node1,node2,node3 想要拆掉 node3 做为单独和 node1,node2 相同配置的集群

保存当前 definitions

GET $host:15672/api/definitions 保存为 json文件

node3 上执行

rabbitmqctl stop_app

node1上执行

rabbitmqctl forget_cluster_node rabbit@node3

node3 上删除 /var/lib/rabbitmq/mnesia 数据库下所有文件， 重启

之后 node3 初始化

rabbitmqctl add_user admin admin
rabbitmqctl set_user_tags admin administrator
rabbitmqctl set_permissions -p / admin ".*" ".*" ".*"

登录到管理台导入json文件

1. linda(张学友 粤语)