elasticsearchHow can I resolve unassigned shards in Elasticsearch?
Unassigned shards in Elasticsearch can be resolved by performing a cluster re-routing operation. This will cause the cluster to re-allocate the shards to the available nodes. To do this, use the Cluster Reroute API
with the allocate_stale_primary
option. This will cause the cluster to try to re-allocate any unassigned shards to their primary node:
curl -XPOST 'localhost:9200/_cluster/reroute?retry_failed&pretty' -H 'Content-Type: application/json' -d'
{
"commands" : [
{
"allocate_stale_primary" : {
"index" : "my_index",
"shard" : 0,
"node" : "node_name",
"accept_data_loss" : true
}
}
]
}
'
The output of this command will be something like this:
{
"state" : "yellow",
"allocated_shards" : 3,
"unassigned_shards" : 0
}
This indicates that the cluster re-routing operation was successful and all shards have been assigned to nodes.
Parts of the code:
curl
: command used to make a request to the Elasticsearch API-XPOST
: flag used to specify the type of request being made (in this case, a POST request)localhost:9200
: address of the Elasticsearch cluster_cluster/reroute
: endpoint of the Cluster Reroute APIretry_failed
: flag used to retry failed re-routing operationsallocate_stale_primary
: command used to re-allocate unassigned shardsindex
: name of the index containing the unassigned shardsshard
: number of the shard to be re-allocatednode
: name of the node to which the shard should be re-allocatedaccept_data_loss
: flag used to indicate that data loss is acceptable
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