是否可以使用 monit 工具监控 hadoop、hbase 和 yarn？

Question

I want to monitor some services such that, those services needs to restart when they goes down and I found an amazing tool monit . It works fine for Zookeeper since I got a condition like matching "QuorumPeerMain" as shown below in monitrc file

check process Zookeeper matching "QuorumPeerMain"
        start program = "path/to/zkServer.sh start"
        stop program  = "path/to/zkServer.sh stop"

In the sameway, I want to monitor these : hadoop, yarn and hbase

check process Hadoop matching "?"
        start program = "startorstop.sh start"  #equivalent to start-dfs.sh
        stop program  = "startorstop.sh stop"   #equivalent to stop-dfs.sh

What should be written in the place of ?

These are the questions

• In the hadoop case, there may be a chance any one of these going down NameNode , DataNode , SecondaryNameNode . Monit Doc says that "The top-most matching parent with highest uptime is selected" . For eg, If DataNode goes down, it still considers NameNode and won't try to restart hadoop . Another option was using pid file and I am not able to find hadoop's pid file in /var/run/
• I want something like a top to bottom approach (not exactly). After starting zookeeper only, I want to start the remaining services like hbase , hadoop and yarn

Answer 1

I got a way to start NameNode , DataNode , SecondaryNameNode independently using shell scripts ie, hadoop-daemon.sh So in my monit conf NameNode looks like

Credits to @OneCricketeer for the comment, So that I can find a way to start these process independently

check process NameNode matching "NameNode"
    start program = "startorstop.sh start"  #hadoop-daemon.sh start namenode
    stop program  = "startorstop.sh stop"   #hadoop-daemon.sh stop namenode
    group hadoop

and for another part of my question, I got depends option. For more detail take a look here Service Dependencies . In my case, I wanted to restart HRegionServer whenever DataNode goes down. So below conf works

check process HRegionServer matching "HRegionServer"
    start program = "startorstop.sh start"  #hbase-daemon.sh start regionserver
    stop program =  "startorstop.sh stop"   #hbase-daemon.sh stop regionserver
    depends on DataNode

check process DataNode matching "DataNode"
    start program = "startorstop.sh start"  #hbase-daemon.sh start datanode
    stop program =  "startorstop.sh stop"   #hbase-daemon.sh stop datanode