double master question

[Andy Chen]

I setup 2 master node and 2 data node on 2 different machines, each machine have 1 master and 1 data node. Assume that 2 machines are in different data centre.

Setting is as follows:

Topology file:

<Configuration>

<Topology>

<DataCenter name="dc1">

<Rack name="rack1">

<Ip>19.168.1.1</Ip>

</Rack>

</DataCenter> <DataCenter name="dc2">

<Rack name="rack1">

<Ip>192.168.1.2

</Rack>

</DataCenter>

</Topology>

</Configuration>

machine1 (192.168.1.1):

$ weed master -ip=192.168.1.1 -port=9333 -mdir=/home/test/dev/weed-fs/master -defaultReplication=100 $ weed volume -dir=/home/test/dev/weed-fs/data -ip=192.168.1.1 -port=8080 -mserver=192.168.1.1:9333

machine2 (192.168.1.2):

$ weed master -ip=192.168.1.2 -port=9333 -mdir=/home/test/dev/weed-fs/master -defaultReplication=100 -peers=192.168.1.1:9333 $ weed volume -dir=/home/test/dev/weed-fs/data -ip=192.168.1.2 -port=8080 -mserver=192.168.1.2:9333

It was quite smooth for upload and download at first. Replication did well as well. But after switching the leader node from machine 1 to machine 2, machine 2 did not take over as the leader.

Could you please help me to check if my setting was wrong?

[Chris Lu]

How did you "switching the leader node from machine 1 to machine"?

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[Andy Chen]

means that when a server(leader) crash(or stop), let the other acts as a leader, automatically.

[Chris Lu]

The leader election is based on Raft protocol. With only 2 masters, it would not be enough to select a leader, since no one can get "majority" votes. You would need to have 3 masters.

Chris

[Andy Chen]

谢谢你的回复,我还是用中文吧,呵呵.

已经起了3个master, 现在master能够自动切换了, 但是有个问题, 就是当leader master停止的时候, volume不能自动连接到新的leader master,查看状态的时候(/dir/status?pretty=y), 显示的volume不全,有的有显示,有的没显示, 如果把停止的master重新启动的话, 就可以显示所有的volume了, 请问这个怎么来解决?

[Chris Lu]

You will need some wait time before the volumes updates their statues on master leader.