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[[cluster]]
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== Cluster APIs
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["float",id="cluster-nodes"]
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=== Node specification
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2018-08-20 09:21:31 -04:00
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Some cluster-level APIs may operate on a subset of the nodes which can be
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specified with _node filters_. For example, the <<tasks,Task Management>>,
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<<cluster-nodes-stats,Nodes Stats>>, and <<cluster-nodes-info,Nodes Info>> APIs
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can all report results from a filtered set of nodes rather than from all nodes.
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_Node filters_ are written as a comma-separated list of individual filters,
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each of which adds or removes nodes from the chosen subset. Each filter can be
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one of the following:
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* `_all`, to add all nodes to the subset.
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* `_local`, to add the local node to the subset.
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* `_master`, to add the currently-elected master node to the subset.
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* a node id or name, to add this node to the subset.
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* an IP address or hostname, to add all matching nodes to the subset.
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* a pattern, using `*` wildcards, which adds all nodes to the subset
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whose name, address or hostname matches the pattern.
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* `master:true`, `data:true`, `ingest:true`, `voting_only:true` or
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`coordinating_only:true`, which respectively add to the subset all
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master-eligible nodes, all data nodes, all ingest nodes, all voting-only
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nodes, and all coordinating-only nodes.
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* `master:false`, `data:false`, `ingest:false`, `voting_only:true`, or
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`coordinating_only:false`, which respectively remove from the subset all
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master-eligible nodes, all data nodes, all ingest nodes, all voting-only
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nodes and all coordinating-only nodes.
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* a pair of patterns, using `*` wildcards, of the form `attrname:attrvalue`,
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which adds to the subset all nodes with a custom node attribute whose name
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and value match the respective patterns. Custom node attributes are
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configured by setting properties in the configuration file of the form
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`node.attr.attrname: attrvalue`.
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NOTE: node filters run in the order in which they are given, which is important
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if using filters that remove nodes from the set. For example
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`_all,master:false` means all the nodes except the master-eligible ones, but
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`master:false,_all` means the same as `_all` because the `_all` filter runs
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after the `master:false` filter.
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NOTE: if no filters are given, the default is to select all nodes. However, if
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any filters are given then they run starting with an empty chosen subset. This
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means that filters such as `master:false` which remove nodes from the chosen
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subset are only useful if they come after some other filters. When used on its
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own, `master:false` selects no nodes.
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NOTE: The `voting_only` role requires the {default-dist} of Elasticsearch and
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is not supported in the {oss-dist}.
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2018-08-20 09:21:31 -04:00
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Here are some examples of the use of node filters with the
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<<cluster-nodes-info,Nodes Info>> APIs.
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[source,js]
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--------------------------------------------------
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# If no filters are given, the default is to select all nodes
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GET /_nodes
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# Explicitly select all nodes
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GET /_nodes/_all
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# Select just the local node
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GET /_nodes/_local
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# Select the elected master node
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GET /_nodes/_master
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# Select nodes by name, which can include wildcards
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GET /_nodes/node_name_goes_here
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GET /_nodes/node_name_goes_*
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# Select nodes by address, which can include wildcards
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GET /_nodes/10.0.0.3,10.0.0.4
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GET /_nodes/10.0.0.*
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# Select nodes by role
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GET /_nodes/_all,master:false
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GET /_nodes/data:true,ingest:true
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GET /_nodes/coordinating_only:true
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GET /_nodes/master:true,voting_only:false
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# Select nodes by custom attribute (e.g. with something like `node.attr.rack: 2` in the configuration file)
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GET /_nodes/rack:2
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GET /_nodes/ra*:2
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GET /_nodes/ra*:2*
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--------------------------------------------------
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2016-09-21 09:27:18 -04:00
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// CONSOLE
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include::cluster/health.asciidoc[]
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include::cluster/state.asciidoc[]
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2013-12-10 05:15:57 -05:00
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include::cluster/stats.asciidoc[]
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2013-11-29 02:21:26 -05:00
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include::cluster/pending.asciidoc[]
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2013-08-28 19:24:34 -04:00
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include::cluster/reroute.asciidoc[]
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include::cluster/update-settings.asciidoc[]
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2018-07-02 13:25:17 -04:00
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include::cluster/get-settings.asciidoc[]
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2013-08-28 19:24:34 -04:00
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include::cluster/nodes-stats.asciidoc[]
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include::cluster/nodes-info.asciidoc[]
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2017-06-12 15:33:56 -04:00
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include::cluster/nodes-usage.asciidoc[]
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include::cluster/remote-info.asciidoc[]
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2016-03-29 09:29:21 -04:00
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include::cluster/tasks.asciidoc[]
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2016-03-29 07:51:11 -04:00
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2013-08-28 19:24:34 -04:00
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include::cluster/nodes-hot-threads.asciidoc[]
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Add API to explain why a shard is or isn't assigned
This adds a new `/_cluster/allocation/explain` API that explains why a
shard can or cannot be allocated to nodes in the cluster. Additionally,
it will show where the master *desires* to put the shard, according to
the `ShardsAllocator`.
It looks like this:
```
GET /_cluster/allocation/explain?pretty
{
"index": "only-foo",
"shard": 0,
"primary": false
}
```
Though, you can optionally send an empty body, which means "explain the
allocation for the first unassigned shard you find".
The output when a shard is unassigned looks like this:
```
{
"shard" : {
"index" : "only-foo",
"index_uuid" : "KnW0-zELRs6PK84l0r38ZA",
"id" : 0,
"primary" : false
},
"assigned" : false,
"unassigned_info" : {
"reason" : "INDEX_CREATED",
"at" : "2016-03-22T20:04:23.620Z"
},
"nodes" : {
"V-Spi0AyRZ6ZvKbaI3691w" : {
"node_name" : "Susan Storm",
"node_attributes" : {
"bar" : "baz"
},
"final_decision" : "NO",
"weight" : 0.06666675,
"decisions" : [ {
"decider" : "filter",
"decision" : "NO",
"explanation" : "node does not match index include filters [foo:\"bar\"]"
} ]
},
"Qc6VL8c5RWaw1qXZ0Rg57g" : {
"node_name" : "Slipstream",
"node_attributes" : {
"bar" : "baz",
"foo" : "bar"
},
"final_decision" : "NO",
"weight" : -1.3833332,
"decisions" : [ {
"decider" : "same_shard",
"decision" : "NO",
"explanation" : "the shard cannot be allocated on the same node id [Qc6VL8c5RWaw1qXZ0Rg57g] on which it already exists"
} ]
},
"PzdyMZGXQdGhqTJHF_hGgA" : {
"node_name" : "The Symbiote",
"node_attributes" : { },
"final_decision" : "NO",
"weight" : 2.3166666,
"decisions" : [ {
"decider" : "filter",
"decision" : "NO",
"explanation" : "node does not match index include filters [foo:\"bar\"]"
} ]
}
}
}
```
And when the shard *is* assigned, the output looks like:
```
{
"shard" : {
"index" : "only-foo",
"index_uuid" : "KnW0-zELRs6PK84l0r38ZA",
"id" : 0,
"primary" : true
},
"assigned" : true,
"assigned_node_id" : "Qc6VL8c5RWaw1qXZ0Rg57g",
"nodes" : {
"V-Spi0AyRZ6ZvKbaI3691w" : {
"node_name" : "Susan Storm",
"node_attributes" : {
"bar" : "baz"
},
"final_decision" : "NO",
"weight" : 1.4499999,
"decisions" : [ {
"decider" : "filter",
"decision" : "NO",
"explanation" : "node does not match index include filters [foo:\"bar\"]"
} ]
},
"Qc6VL8c5RWaw1qXZ0Rg57g" : {
"node_name" : "Slipstream",
"node_attributes" : {
"bar" : "baz",
"foo" : "bar"
},
"final_decision" : "CURRENTLY_ASSIGNED",
"weight" : 0.0,
"decisions" : [ {
"decider" : "same_shard",
"decision" : "NO",
"explanation" : "the shard cannot be allocated on the same node id [Qc6VL8c5RWaw1qXZ0Rg57g] on which it already exists"
} ]
},
"PzdyMZGXQdGhqTJHF_hGgA" : {
"node_name" : "The Symbiote",
"node_attributes" : { },
"final_decision" : "NO",
"weight" : 3.6999998,
"decisions" : [ {
"decider" : "filter",
"decision" : "NO",
"explanation" : "node does not match index include filters [foo:\"bar\"]"
} ]
}
}
}
```
Only "NO" decisions are returned by default, but all decisions can be
shown by specifying the `?include_yes_decisions=true` parameter in the
request.
Resolves #14593
2016-02-26 15:21:36 -05:00
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include::cluster/allocation-explain.asciidoc[]
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2019-01-07 12:11:14 -05:00
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include::cluster/voting-exclusions.asciidoc[]
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