Nodes stats in elasticsearch

nodes stats

nodes statistics

The cluster nodes stats API allows to retrieve one or more (or all) of the cluster nodes statistics.

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 explainedhere.

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:

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

# 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.

field data statistics

You can get information about field data memory usage on node level or on index level.

# 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

Ref: http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/cluster-nodes-stats.html