Skip to content

Celeborn Ratis-shell

Ratis-shell is the command line interface of Ratis. Celeborn uses Ratis to implement the HA function of the master, Celeborn directly introduces ratis-shell package into the project then it's convenient for Celeborn Admin to operate the master ratis service.

Note: Ratis-shell is currently only experimental. The compatibility story is not considered for the time being.

Availability

Version Available in src tarball? Available in bin tarball?
< 0.3.0 No No
>= 0.3.0 Yes Yes

Setting up the Celeborn ratis-shell

Celeborn directly introduces the ratis-shell into the project, users don't need to set up ratis-shell env from ratis repo. User can directly download the Celeborn source tarball from Download and build the Celeborn according to build_and_test or just download the pre-built binary tarball from Download to get the binary package apache-celeborn-<VERSION>-bin.tgz.

After getting the binary package apache-celeborn-<VERSION>-bin.tgz: 

$ tar -C <DST_DIR> -zxvf apache-celeborn-<VERSION>-bin.tgz
$ ln -s <DST_DIR>/apache-celeborn-<VERSION>-bin <DST_DIR>/celeborn

Export the following environment variable and add the bin directory to the $PATH. 

$ export CELEBORN_HOME=<DST_DIR>/celeborn
$ export PATH=${CELEBORN_HOME}/bin:$PATH

The following command can be invoked in order to get the basic usage:

$ celeborn-ratis sh
Usage: celeborn-ratis sh [generic options]
         [election [transfer] [stepDown] [pause] [resume]]
         [group [info] [list]]
         [peer [add] [remove] [setPriority]]
         [snapshot [create]]

generic options

The generic options pass values for a given ratis-shell property. It supports the following content: -D*, -X*, -agentlib*, -javaagent*

$ celeborn-ratis sh -D<property=value> ...

Note:

Celeborn HA uses NETTY as the default RPC type, for details please refer to configuration celeborn.master.ha.ratis.raft.rpc.type. But Ratis uses GRPC as the default RPC type. So if the user wants to use Ratis shell to access Ratis cluster which uses NETTY RPC type, the generic option -Draft.rpc.type=NETTY should be set to change the RPC type of Ratis shell to Netty.

election

The election command manages leader election. It has the following subcommands: transfer, stepDown, pause, resume

election transfer

Transfer a group leader to the specified server. 

$ celeborn-ratis sh election transfer -peers <P0_HOST:P0_PORT,P1_HOST:P1_PORT,P2_HOST:P2_PORT> -address <HOSTNAME:PORT> [-groupid <RAFT_GROUP_ID>]

election stepDown

Make a group leader of the given group step down its leadership. 

$ celeborn-ratis sh election stepDown -peers <P0_HOST:P0_PORT,P1_HOST:P1_PORT,P2_HOST:P2_PORT> [-groupid <RAFT_GROUP_ID>]

election pause

Pause leader election at the specified server. Then, the specified server would not start a leader election. 

$ celeborn-ratis sh election pause -peers <P0_HOST:P0_PORT,P1_HOST:P1_PORT,P2_HOST:P2_PORT> -address <HOSTNAME:PORT> [-groupid <RAFT_GROUP_ID>]

election resume

Resume leader election at the specified server. 

$ celeborn-ratis sh election resume -peers <P0_HOST:P0_PORT,P1_HOST:P1_PORT,P2_HOST:P2_PORT> -address <HOSTNAME:PORT> [-groupid <RAFT_GROUP_ID>]

group

The group command manages ratis groups. It has the following subcommands: info, list

group info

Display the information of a specific raft group. 

$ celeborn-ratis sh group info -peers <P0_HOST:P0_PORT,P1_HOST:P1_PORT,P2_HOST:P2_PORT> [-groupid <RAFT_GROUP_ID>]

group list

Display the group information of a specific raft server 

$ celeborn-ratis sh group list -peers <P0_HOST:P0_PORT,P1_HOST:P1_PORT,P2_HOST:P2_PORT> [-groupid <RAFT_GROUP_ID>]  <[-serverAddress <P0_HOST:P0_PORT>]|[-peerId <peerId0>]>

peer

The peer command manages ratis cluster peers. It has the following subcommands: add, remove, setPriority

peer add

Add peers to a ratis group. 

$ celeborn-ratis sh peer add -peers <P0_HOST:P0_PORT,P1_HOST:P1_PORT,P2_HOST:P2_PORT> [-groupid <RAFT_GROUP_ID>] -address <P4_HOST:P4_PORT,...,PN_HOST:PN_PORT>

peer remove

Remove peers to from a ratis group. 

$ celeborn-ratis sh peer remove -peers <P0_HOST:P0_PORT,P1_HOST:P1_PORT,P2_HOST:P2_PORT> [-groupid <RAFT_GROUP_ID>] -address <P0_HOST:P0_PORT,...>

peer setPriority

Set priority to ratis peers. The priority of ratis peer can affect the leader election, the server with the highest priority will eventually become the leader of the cluster. 

$ celeborn-ratis sh peer setPriority -peers <P0_HOST:P0_PORT,P1_HOST:P1_PORT,P2_HOST:P2_PORT> [-groupid <RAFT_GROUP_ID>] -addressPriority <P0_HOST:P0_PORT|PRIORITY>

snapshot

The snapshot command manages ratis snapshot. It has the following subcommands: create

snapshot create

Trigger the specified server take snapshot. 

$ celeborn-ratis sh snapshot create -peers <P0_HOST:P0_PORT,P1_HOST:P1_PORT,P2_HOST:P2_PORT> -peerId <peerId0> [-groupid <RAFT_GROUP_ID>]