MapR commands - 9 Managing the Cluster

• Alarm email

maprcli alarm config save -values "AE_ALARM_AEQUOTA_EXCEEDED,1,test@example.com"
maprcli alarm config save -values "NODE_ALARM_CORE_PRESENT,1,myname.xxx@xxx.com"

• List Alarm

$ maprcli alarm list -type cluster
alarm state  description                                             entity   alarm name                             alarm statechange time  
1            One or more licenses is about to expire within 28 days  CLUSTER  CLUSTER_ALARM_LICENSE_NEAR_EXPIRATION  1330171978541 

$ maprcli alarm list -type node
alarm state  description                                                                            entity  alarm name                    alarm statechange time  
1            Can not determine if service: cldb is running. Check logs at: /opt/mapr/logs/cldb.log  sdw1    NODE_ALARM_SERVICE_CLDB_DOWN  1324274386763           
1            Node has core file(s)                                                                  mdw     NODE_ALARM_CORE_PRESENT       1330145172579  

• List Nodes

maprcli node list -columns id,h,hn,br,da,dtotal,dused,davail,fs-heartbeat
maprcli node list -columns id,br,fs-heartbeat,jt-heartbeat

• Reformat a Node

Stop warden:

/etc/init.d/mapr-warden stop

Remove the disktab file:

rm /opt/mapr/conf/disktab

Create a text file /tmp/disks.txt that lists all the disks and partitions to format for use.

# cat  /tmp/disks.txt
/data2/hdpee/storagefile 

Use disksetup to re-format the disks

/opt/mapr/server/disksetup -F /tmp/disks.txt

Start the Warden:

/etc/init.d/mapr-warden start

• Remove a Node

Take server5 for example.Stop warden on server5:

/etc/init.d/mapr-warden stop

Remove on CLDB node: 

maprcli node remove -nodes server5 -zkconnect server1:5181

• Add a Node

/opt/mapr/server/configure.sh -C master -Z server1 -N mynameCluster
/opt/mapr/server/disksetup -F /tmp/disks.txt
/etc/init.d/mapr-warden start

• Memory overcommit

If the node has swap space, type "sysctl -w vm.overcommit_memory=0"
If the node does not have swap space, type "sysctl -w vm.overcommit_memory=1"
If you have a compelling reason to use vm.overcommit_memory=2, you should set overcommit_ratio to 100 by typing: "sysctl -w vm.overcommit_ratio=100"

• List topology

maprcli node topo