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Nodes Stats

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Nodes Stats

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Nodes statistics

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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 explained here.

By default, all stats are returned. You can limit this by combining any of indices, os, process, jvm, 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 (see FS information)
`http`	HTTP connection information
`jvm`	JVM stats, memory pool information, garbage collection, buffer pools, number of loaded/unloaded classes
`os`	Operating system stats, load average, mem, swap (see OS statistics)
`process`	Process statistics, memory consumption, cpu usage, open file descriptors (see Process statistics)
`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.

FS information

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The fs flag can be set to retrieve information that concern the file system:

fs.timestamp: Last time the file stores statistics have been refreshed
fs.total.total_in_bytes: Total size (in bytes) of all file stores
fs.total.free_in_bytes: Total number of unallocated bytes in all file stores
fs.total.available_in_bytes: Total number of bytes available to this Java virtual machine on all file stores
fs.data: List of all file stores
fs.data.path: Path to the file store
fs.data.mount: Mount point of the file store (ex: /dev/sda2)
fs.data.type: Type of the file store (ex: ext4)
fs.data.total_in_bytes: Total size (in bytes) of the file store
fs.data.free_in_bytes: Total number of unallocated bytes in the file store
fs.data.available_in_bytes: Total number of bytes available to this Java virtual machine on this file store
fs.data.spins (Linux only): Indicates if the file store is backed by spinning storage. null means we could not determine it, true means the device possibly spins and false means it does not (ex: solid-state disks).

Operating System statistics

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The os flag can be set to retrieve statistics that concern the operating system:

os.timestamp: Last time the operating system statistics have been refreshed
os.load_average: System load average for the last minute, or -1 if not supported
os.mem.total_in_bytes: Total amount of physical memory in bytes
os.mem.free_in_bytes: Amount of free physical memory in bytes
os.mem.free_percent: Percentage of free memory
os.mem.used_in_bytes: Amount of used physical memory in bytes
os.mem.used_percent: Percentage of used memory
os.swap.total_in_bytes: Total amount of swap space in bytes
os.swap.free_in_bytes: Amount of free swap space in bytes
os.swap.used_in_bytes: Amount of used swap space in bytes

Process statistics

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The process flag can be set to retrieve statistics that concern the current running process:

process.timestamp: Last time the process statistics have been refreshed
process.open_file_descriptors: Number of opened file descriptors associated with the current process, or -1 if not supported
process.max_file_descriptors: Maximum number of file descriptors allowed on the system, or -1 if not supported
process.cpu.percent: CPU usage in percent, or -1 if not known at the time the stats are computed
process.cpu.total_in_millis: CPU time (in milliseconds) used by the process on which the Java virtual machine is running, or -1 if not supported
process.mem.total_virtual_in_bytes: Size in bytes of virtual memory that is guaranteed to be available to the running process

Field data statistics

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

# Node Stats
curl -XGET 'http://localhost:9200/_nodes/stats/indices/?fields=field1,field2&pretty'

# Indices Stat
curl -XGET 'http://localhost:9200/_stats/fielddata/?fields=field1,field2&pretty'

# You can use wildcards for field names
curl -XGET 'http://localhost:9200/_stats/fielddata/?fields=field*&pretty'
curl -XGET 'http://localhost:9200/_nodes/stats/indices/?fields=field*&pretty'

Search groups

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You can get statistics about search groups for searches executed on this node.

# All groups with all stats
curl -XGET 'http://localhost:9200/_nodes/stats?pretty&groups=_all'

# Some groups from just the indices stats
curl -XGET 'http://localhost:9200/_nodes/stats/indices?pretty&groups=foo,bar'

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