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When doing a rolling restart we recommend disabling shard allocation to avoid unnecessary recoveries. However, this advise is unnecessary or even harmful when restarting nodes that do not carry any data like a pure ML node.
19 lines
734 B
Text
19 lines
734 B
Text
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When you shut down a data node, the allocation process waits for
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`index.unassigned.node_left.delayed_timeout` (by default, one minute) before
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starting to replicate the shards on that node to other nodes in the cluster,
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which can involve a lot of I/O. Since the node is shortly going to be
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restarted, this I/O is unnecessary. You can avoid racing the clock by
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<<cluster-routing-allocation-enable,disabling allocation>> of replicas before
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shutting down <<data-node,data nodes>>:
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[source,console]
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--------------------------------------------------
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PUT _cluster/settings
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{
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"persistent": {
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"cluster.routing.allocation.enable": "primaries"
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}
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}
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--------------------------------------------------
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// TEST[skip:indexes don't assign]
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