Is Galera Arbitrator really required?
I have three nodes(as recommended, in different switches) forming a Galera Cluster. Is there any real requirement of 'Garbd'? I don't see much reasons for using this apart from avoiding split-brain or taking backups?
Another doubt regarding garbd is that suppose I have 3 nodes in the cluster, and adding a garbd node will make the cluster size of 4, which is an even-numbered quorum. Will this not cause a split-brain situation?
mysql galera
asked Dec 22 '16 at 8:54
Nandan ANandan A
83
add a comment |
I have three nodes(as recommended, in different switches) forming a Galera Cluster. Is there any real requirement of 'Garbd'? I don't see much reasons for using this apart from avoiding split-brain or taking backups?
Another doubt regarding garbd is that suppose I have 3 nodes in the cluster, and adding a garbd node will make the cluster size of 4, which is an even-numbered quorum. Will this not cause a split-brain situation?
mysql galera
asked Dec 22 '16 at 8:54
Nandan ANandan A
83
add a comment |
I have three nodes(as recommended, in different switches) forming a Galera Cluster. Is there any real requirement of 'Garbd'? I don't see much reasons for using this apart from avoiding split-brain or taking backups?
Another doubt regarding garbd is that suppose I have 3 nodes in the cluster, and adding a garbd node will make the cluster size of 4, which is an even-numbered quorum. Will this not cause a split-brain situation?
mysql galera
asked Dec 22 '16 at 8:54
Nandan ANandan A
83
I have three nodes(as recommended, in different switches) forming a Galera Cluster. Is there any real requirement of 'Garbd'? I don't see much reasons for using this apart from avoiding split-brain or taking backups?
Another doubt regarding garbd is that suppose I have 3 nodes in the cluster, and adding a garbd node will make the cluster size of 4, which is an even-numbered quorum. Will this not cause a split-brain situation?
mysql galera
mysql galera
asked Dec 22 '16 at 8:54
Nandan ANandan A
83
asked Dec 22 '16 at 8:54
Nandan ANandan A
83
asked Dec 22 '16 at 8:54
Nandan ANandan A
83
asked Dec 22 '16 at 8:54
Nandan ANandan A
83
asked Dec 22 '16 at 8:54
Nandan ANandan A
83
83
add a comment |
add a comment |
2 Answers
2
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oldest
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If you have minimum of three active nodes in your cluster, you don't need to add garbd.
You should use a garbd with the following conditions:
- When you have an even number of nodes and you can't add new nodes (because of cost or ...) to avoid split-brain situations.
- when you want to backup data (SST method) to a server.
More information:
http://galeracluster.com/documentation-webpages/arbitrator.html
answered Dec 22 '16 at 10:00
HamoonDBAHamoonDBA
52128
2 needs a 3rd node. 4 does not need a 5th in order to recover from a single-server failure. (I sent them a comment.)
– Rick James
Dec 23 '16 at 4:32
add a comment |
It's basically for 2 node clusters where you don't need a 3rd but need to avoid split brain.
answered 33 mins ago
VICTOR HOODICOFFVICTOR HOODICOFF
1
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VICTOR HOODICOFF is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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2 Answers
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2 Answers
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If you have minimum of three active nodes in your cluster, you don't need to add garbd.
You should use a garbd with the following conditions:
- When you have an even number of nodes and you can't add new nodes (because of cost or ...) to avoid split-brain situations.
- when you want to backup data (SST method) to a server.
More information:
http://galeracluster.com/documentation-webpages/arbitrator.html
answered Dec 22 '16 at 10:00
HamoonDBAHamoonDBA
52128
2 needs a 3rd node. 4 does not need a 5th in order to recover from a single-server failure. (I sent them a comment.)
– Rick James
Dec 23 '16 at 4:32
add a comment |
If you have minimum of three active nodes in your cluster, you don't need to add garbd.
You should use a garbd with the following conditions:
- When you have an even number of nodes and you can't add new nodes (because of cost or ...) to avoid split-brain situations.
- when you want to backup data (SST method) to a server.
More information:
http://galeracluster.com/documentation-webpages/arbitrator.html
answered Dec 22 '16 at 10:00
HamoonDBAHamoonDBA
52128
2 needs a 3rd node. 4 does not need a 5th in order to recover from a single-server failure. (I sent them a comment.)
– Rick James
Dec 23 '16 at 4:32
add a comment |
If you have minimum of three active nodes in your cluster, you don't need to add garbd.
You should use a garbd with the following conditions:
- When you have an even number of nodes and you can't add new nodes (because of cost or ...) to avoid split-brain situations.
- when you want to backup data (SST method) to a server.
More information:
http://galeracluster.com/documentation-webpages/arbitrator.html
answered Dec 22 '16 at 10:00
HamoonDBAHamoonDBA
52128
If you have minimum of three active nodes in your cluster, you don't need to add garbd.
You should use a garbd with the following conditions:
- When you have an even number of nodes and you can't add new nodes (because of cost or ...) to avoid split-brain situations.
- when you want to backup data (SST method) to a server.
More information:
http://galeracluster.com/documentation-webpages/arbitrator.html
answered Dec 22 '16 at 10:00
HamoonDBAHamoonDBA
52128
answered Dec 22 '16 at 10:00
HamoonDBAHamoonDBA
52128
answered Dec 22 '16 at 10:00
HamoonDBAHamoonDBA
52128
answered Dec 22 '16 at 10:00
HamoonDBAHamoonDBA
52128
52128
2 needs a 3rd node. 4 does not need a 5th in order to recover from a single-server failure. (I sent them a comment.)
– Rick James
Dec 23 '16 at 4:32
add a comment |
2 needs a 3rd node. 4 does not need a 5th in order to recover from a single-server failure. (I sent them a comment.)
– Rick James
Dec 23 '16 at 4:32
2 needs a 3rd node. 4 does not need a 5th in order to recover from a single-server failure. (I sent them a comment.)
– Rick James
Dec 23 '16 at 4:32
2 needs a 3rd node. 4 does not need a 5th in order to recover from a single-server failure. (I sent them a comment.)
– Rick James
Dec 23 '16 at 4:32
add a comment |
It's basically for 2 node clusters where you don't need a 3rd but need to avoid split brain.
answered 33 mins ago
VICTOR HOODICOFFVICTOR HOODICOFF
1
New contributor
VICTOR HOODICOFF 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 |
It's basically for 2 node clusters where you don't need a 3rd but need to avoid split brain.
answered 33 mins ago
VICTOR HOODICOFFVICTOR HOODICOFF
1
New contributor
VICTOR HOODICOFF 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 |
It's basically for 2 node clusters where you don't need a 3rd but need to avoid split brain.
answered 33 mins ago
VICTOR HOODICOFFVICTOR HOODICOFF
1
New contributor
VICTOR HOODICOFF is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
It's basically for 2 node clusters where you don't need a 3rd but need to avoid split brain.
answered 33 mins ago
VICTOR HOODICOFFVICTOR HOODICOFF
1
New contributor
VICTOR HOODICOFF is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
answered 33 mins ago
VICTOR HOODICOFFVICTOR HOODICOFF
1
New contributor
VICTOR HOODICOFF is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
answered 33 mins ago
VICTOR HOODICOFFVICTOR HOODICOFF
1
answered 33 mins ago
VICTOR HOODICOFFVICTOR HOODICOFF
1
1
New contributor
VICTOR HOODICOFF is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
VICTOR HOODICOFF is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
VICTOR HOODICOFF 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 |
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