Hello,
In our Elasticsearch cluster we have 3 master nodes. I've noticed that from time to time one of them is under a heavy load while the other two seem to be doing nothing. Is that normal for elastic master nodes or is that a sign of something bad?
It looks like this in Cerebro:
Without the column headings it's a little hard to be sure what these numbers mean. However, Elasticsearch does elect a single master-eligible node to be in charge of the cluster and this elected node does perform a lot more work than the other master-eligible ones, so this kind of mismatch seems reasonable to me.
That's how HEAP USAGE of that specific node looks in Kibana's monitoring:
Two other master nodes, including the "master of masters":
I think i found the problem. Garbage Collector on that "strange" node.
Had to correct JVM settings on that one node. Problem solved.
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