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[[cluster-nodes-stats]]
== Nodes Stats
[float]
=== Nodes statistics
The cluster nodes stats API allows to retrieve one or more (or all) of
the cluster nodes statistics.
[source,js]
--------------------------------------------------
curl -XGET 'http://localhost:9200/_nodes/stats'
curl -XGET 'http://localhost:9200/_nodes/nodeId1,nodeId2/stats'
--------------------------------------------------
The first command retrieves stats of all the nodes in the cluster. The
second command selectively retrieves nodes stats of only `nodeId1` and
`nodeId2`. All the nodes selective options are explained
<<cluster-nodes,here>>.
By default, all stats are returned. You can limit this by combining any
of `indices`, `os`, `process`, `jvm`, `network`, `transport`, `http`,
`fs`, `breaker` and `thread_pool`. For example:
[horizontal]
`indices`::
Indices stats about size, document count, indexing and
deletion times, search times, field cache size , merges and flushes
`fs`::
File system information, data path, free disk space, read/write
stats
`http`::
HTTP connection information
`jvm`::
JVM stats, memory pool information, garbage collection, buffer
pools
`network`::
TCP information
`os`::
Operating system stats, load average, cpu, mem, swap
`process`::
Process statistics, memory consumption, cpu usage, open
file descriptors
`thread_pool`::
Statistics about each thread pool, including current
size, queue and rejected tasks
`transport`::
Transport statistics about sent and received bytes in
cluster communication
`breaker`::
Statistics about the field data circuit breaker
`clear`::
Clears all the flags (first). Useful, if you only want to
retrieve specific stats.
[source,js]
--------------------------------------------------
# return indices and os
curl -XGET 'http://localhost:9200/_nodes/stats/os'
# return just os and process
curl -XGET 'http://localhost:9200/_nodes/stats/os,process'
# specific type endpoint
curl -XGET 'http://localhost:9200/_nodes/stats/process'
curl -XGET 'http://localhost:9200/_nodes/10.0.0.1/stats/process'
--------------------------------------------------
The `all` flag can be set to return all the stats.
[float]
[[field-data]]
=== Field data statistics
You can get information about field data memory usage on node
level or on index level.
[source,js]
--------------------------------------------------
# Node Stats
curl localhost:9200/_nodes/stats/indices/field1,field2?pretty
# Indices Stat
curl localhost:9200/_stats/fielddata/field1,field2?pretty
# You can use wildcards for field names
curl localhost:9200/_stats/fielddata/field*?pretty
curl localhost:9200/_nodes/stats/indices/field*?pretty
--------------------------------------------------
|
