Cache stats API

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Retrieves statistics about the shared cache for partially mounted indices.

Request

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GET /_searchable_snapshots/cache/stats

GET /_searchable_snapshots/<node_id>/cache/stats

Prerequisites

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If the Elasticsearch security features are enabled, you must have the manage cluster privilege to use this API. For more information, see Security privileges.

Path parameters

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<node_id>
(Optional, string) The names of particular nodes in the cluster to target. For example, nodeId1,nodeId2. For node selection options, see Node specification.

Query parameters

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master_timeout
(Optional, time units) Period to wait for a connection to the master node. If no response is received before the timeout expires, the request fails and returns an error. Defaults to 30s.

Response body

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nodes

(object) Contains statistics for the nodes selected by the request.

Properties of nodes
<node_id>

(object) Contains statistics for the node with the given identifier.

Properties of <node_id>
shared_cache

(object) Contains statistics about the shared cache file.

Properties of shared_cache
reads
(long) Number of times the shared cache is used to read data from.
bytes_read_in_bytes
(long) The total of bytes read from the shared cache.
writes
(long) Number of times data from the blob store repository is written in the shared cache.
bytes_written_in_bytes
(long) The total of bytes written in the shared cache.
evictions
(long) Number of regions evicted from the shared cache file.
num_regions
(integer) Number of regions in the shared cache file.
size_in_bytes
(long) The total size in bytes of the shared cache file.
region_size_in_bytes
(long) The size in bytes of a region in the shared cache file.

Examples

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Gets the statistics about the shared cache for partially mounted indices from all data nodes:

GET /_searchable_snapshots/cache/stats

The API returns the following response:

{
  "nodes" : {
    "eerrtBMtQEisohZzxBLUSw" : {
      "shared_cache" : {
        "reads" : 6051,
        "bytes_read_in_bytes" : 5448829,
        "writes" : 37,
        "bytes_written_in_bytes" : 1208320,
        "evictions" : 5,
        "num_regions" : 65536,
        "size_in_bytes" : 1099511627776,
        "region_size_in_bytes" : 16777216
      }
    }
  }
}