Hello everyone,
I would like to understand something about shards and replica,
I have a cluster of 3 DATA nodes (2 Hot and 1 Warm), I have configured ILM to have one shard and one replica in the HOT nodes, and then once it passed to the WARM node, I delete the replica and just save the shards in that node.
Today when I restarted one of my HOT nodes, the stat of some of shards in the WARM
nodes became YELLOW
I would like to understand why these shards have been affected as they are in the WARM node and not in the Hot nodes ?
wehn I run GET _cluster/allocation/explain?pretty
I get some output like these :
"allocate_explanation" : "cannot allocate because allocation is not permitted to any of the nodes",
"explanation" : "index has a preference for tiers [data_warm,data_hot] and node does not meet the required [data_warm] tier"
"explanation" : "index has a preference for tiers [data_warm,data_hot] and node does not meet the required [data_warm] tier"
"explanation" : "a copy of this shard is already allocated to this node [[metricbeat-7.10.1-2021.03.19-000003][0], node[nN9JxEJrTQ6wIBoQLHC-WA], [P], s[STARTED], a[id=MEt6XzEhS1G2WH6n-2-1jg]]"
Thanks for your help