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Galera cluster is still accepting writes on a single node when 2 of 3 nodes are down
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I am running a 3 clusters galera database, and during redundancy tests, I saw that if I shutdown properly 2 of 3 nodes, the last one still accepts writes, even being the only only one up.
I am not sure that this is the way I want my cluster to work. Is it possible to set the cluster to reject writes when only 1 node is up?
linux mysql cluster
asked yesterday
DazulDazul
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I am running a 3 clusters galera database, and during redundancy tests, I saw that if I shutdown properly 2 of 3 nodes, the last one still accepts writes, even being the only only one up.
I am not sure that this is the way I want my cluster to work. Is it possible to set the cluster to reject writes when only 1 node is up?
linux mysql cluster
asked yesterday
DazulDazul
82
New contributor
Dazul is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
I am running a 3 clusters galera database, and during redundancy tests, I saw that if I shutdown properly 2 of 3 nodes, the last one still accepts writes, even being the only only one up.
I am not sure that this is the way I want my cluster to work. Is it possible to set the cluster to reject writes when only 1 node is up?
linux mysql cluster
asked yesterday
DazulDazul
82
New contributor
Dazul is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
I am running a 3 clusters galera database, and during redundancy tests, I saw that if I shutdown properly 2 of 3 nodes, the last one still accepts writes, even being the only only one up.
I am not sure that this is the way I want my cluster to work. Is it possible to set the cluster to reject writes when only 1 node is up?
linux mysql cluster
linux mysql cluster
asked yesterday
DazulDazul
82
New contributor
Dazul is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked yesterday
DazulDazul
82
New contributor
Dazul is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked yesterday
DazulDazul
82
New contributor
Dazul is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked yesterday
DazulDazul
82
asked yesterday
DazulDazul
82
82
New contributor
Dazul is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
Dazul is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Dazul is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
add a comment |
1 Answer
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The cluster size (wsrep_cluster_size) is a dynamic value that scales up and down as you bring up and take down nodes in your Galera Cluster.
When you gracefully shut down two of your three nodes, you're effectively handing the Primary Component status to the remaining node. There is no risk of data diverging (split-brain), so it is still safe for the last node to serve requests. The cluster size becomes 1, and you're practically left running a single MySQL server.
Is it possible to set the cluster to reject writes when only 1 node is up?
I don't think Galera Cluster works like this. Conceptually, the nodes just care about forming a quorum. For each of the nodes, if it is in the majority, it holds the Primary Component status. The isolated nodes become non-primary.
If you abruptly lost two of your three nodes, then the remaining node will find itself in the minority, enter the non-primary status (shown in wsrep_cluster_status), and refuse reads and writes.
Additional Resources
Weighted Quorum in the Galera Cluster Documentation
How the Primary Component status stays with the majority:
How Galera Cluster protects itself from split-brain scenarios by putting nodes without a majority into the non-primary status:
answered yesterday
DeltikDeltik
13.5k144988
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
The cluster size (wsrep_cluster_size) is a dynamic value that scales up and down as you bring up and take down nodes in your Galera Cluster.
When you gracefully shut down two of your three nodes, you're effectively handing the Primary Component status to the remaining node. There is no risk of data diverging (split-brain), so it is still safe for the last node to serve requests. The cluster size becomes 1, and you're practically left running a single MySQL server.
Is it possible to set the cluster to reject writes when only 1 node is up?
I don't think Galera Cluster works like this. Conceptually, the nodes just care about forming a quorum. For each of the nodes, if it is in the majority, it holds the Primary Component status. The isolated nodes become non-primary.
If you abruptly lost two of your three nodes, then the remaining node will find itself in the minority, enter the non-primary status (shown in wsrep_cluster_status), and refuse reads and writes.
Additional Resources
Weighted Quorum in the Galera Cluster Documentation
How the Primary Component status stays with the majority:
How Galera Cluster protects itself from split-brain scenarios by putting nodes without a majority into the non-primary status:
answered yesterday
DeltikDeltik
13.5k144988
add a comment |
The cluster size (wsrep_cluster_size) is a dynamic value that scales up and down as you bring up and take down nodes in your Galera Cluster.
When you gracefully shut down two of your three nodes, you're effectively handing the Primary Component status to the remaining node. There is no risk of data diverging (split-brain), so it is still safe for the last node to serve requests. The cluster size becomes 1, and you're practically left running a single MySQL server.
Is it possible to set the cluster to reject writes when only 1 node is up?
I don't think Galera Cluster works like this. Conceptually, the nodes just care about forming a quorum. For each of the nodes, if it is in the majority, it holds the Primary Component status. The isolated nodes become non-primary.
If you abruptly lost two of your three nodes, then the remaining node will find itself in the minority, enter the non-primary status (shown in wsrep_cluster_status), and refuse reads and writes.
Additional Resources
Weighted Quorum in the Galera Cluster Documentation
How the Primary Component status stays with the majority:
How Galera Cluster protects itself from split-brain scenarios by putting nodes without a majority into the non-primary status:
answered yesterday
DeltikDeltik
13.5k144988
add a comment |
The cluster size (wsrep_cluster_size) is a dynamic value that scales up and down as you bring up and take down nodes in your Galera Cluster.
When you gracefully shut down two of your three nodes, you're effectively handing the Primary Component status to the remaining node. There is no risk of data diverging (split-brain), so it is still safe for the last node to serve requests. The cluster size becomes 1, and you're practically left running a single MySQL server.
Is it possible to set the cluster to reject writes when only 1 node is up?
I don't think Galera Cluster works like this. Conceptually, the nodes just care about forming a quorum. For each of the nodes, if it is in the majority, it holds the Primary Component status. The isolated nodes become non-primary.
If you abruptly lost two of your three nodes, then the remaining node will find itself in the minority, enter the non-primary status (shown in wsrep_cluster_status), and refuse reads and writes.
Additional Resources
Weighted Quorum in the Galera Cluster Documentation
How the Primary Component status stays with the majority:
How Galera Cluster protects itself from split-brain scenarios by putting nodes without a majority into the non-primary status:
answered yesterday
DeltikDeltik
13.5k144988
The cluster size (wsrep_cluster_size) is a dynamic value that scales up and down as you bring up and take down nodes in your Galera Cluster.
When you gracefully shut down two of your three nodes, you're effectively handing the Primary Component status to the remaining node. There is no risk of data diverging (split-brain), so it is still safe for the last node to serve requests. The cluster size becomes 1, and you're practically left running a single MySQL server.
Is it possible to set the cluster to reject writes when only 1 node is up?
I don't think Galera Cluster works like this. Conceptually, the nodes just care about forming a quorum. For each of the nodes, if it is in the majority, it holds the Primary Component status. The isolated nodes become non-primary.
If you abruptly lost two of your three nodes, then the remaining node will find itself in the minority, enter the non-primary status (shown in wsrep_cluster_status), and refuse reads and writes.
Additional Resources
Weighted Quorum in the Galera Cluster Documentation
How the Primary Component status stays with the majority:
How Galera Cluster protects itself from split-brain scenarios by putting nodes without a majority into the non-primary status:
answered yesterday
DeltikDeltik
13.5k144988
answered yesterday
DeltikDeltik
13.5k144988
answered yesterday
DeltikDeltik
13.5k144988
answered yesterday
DeltikDeltik
13.5k144988
13.5k144988
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Dazul is a new contributor. Be nice, and check out our Code of Conduct.
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