245 lines
6.4 KiB
Plaintext
245 lines
6.4 KiB
Plaintext
[[cat]]
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= cat APIs
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[partintro]
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--
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["float",id="intro"]
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== Introduction
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JSON is great... for computers. Even if it's pretty-printed, trying
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to find relationships in the data is tedious. Human eyes, especially
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when looking at an ssh terminal, need compact and aligned text. The
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cat API aims to meet this need.
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All the cat commands accept a query string parameter `help` to see all
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the headers and info they provide, and the `/_cat` command alone lists all
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the available commands.
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[float]
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[[common-parameters]]
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== Common parameters
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[float]
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[[verbose]]
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=== Verbose
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Each of the commands accepts a query string parameter `v` to turn on
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verbose output. For example:
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[source,js]
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--------------------------------------------------
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GET /_cat/master?v
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--------------------------------------------------
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// CONSOLE
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Might respond with:
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[source,txt]
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--------------------------------------------------
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id host ip node
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u_n93zwxThWHi1PDBJAGAg 127.0.0.1 127.0.0.1 u_n93zw
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--------------------------------------------------
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// TESTRESPONSE[s/u_n93zw(xThWHi1PDBJAGAg)?/.+/ _cat]
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[float]
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[[help]]
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=== Help
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Each of the commands accepts a query string parameter `help` which will
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output its available columns. For example:
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[source,js]
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--------------------------------------------------
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GET /_cat/master?help
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--------------------------------------------------
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// CONSOLE
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Might respond respond with:
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[source,txt]
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--------------------------------------------------
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id | | node id
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host | h | host name
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ip | | ip address
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node | n | node name
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--------------------------------------------------
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// TESTRESPONSE[s/[|]/[|]/ _cat]
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[float]
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[[headers]]
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=== Headers
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Each of the commands accepts a query string parameter `h` which forces
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only those columns to appear. For example:
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[source,js]
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--------------------------------------------------
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GET /_cat/nodes?h=ip,port,heapPercent,name
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--------------------------------------------------
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// CONSOLE
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Responds with:
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[source,txt]
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--------------------------------------------------
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127.0.0.1 9300 27 sLBaIGK
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--------------------------------------------------
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// TESTRESPONSE[s/9300 27 sLBaIGK/\\d+ \\d+ .+/ _cat]
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You can also request multiple columns using simple wildcards like
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`/_cat/thread_pool?h=ip,bulk.*` to get all headers (or aliases) starting
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with `bulk.`.
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[float]
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[[numeric-formats]]
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=== Numeric formats
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Many commands provide a few types of numeric output, either a byte, size
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or a time value. By default, these types are human-formatted,
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for example, `3.5mb` instead of `3763212`. The human values are not
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sortable numerically, so in order to operate on these values where
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order is important, you can change it.
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Say you want to find the largest index in your cluster (storage used
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by all the shards, not number of documents). The `/_cat/indices` API
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is ideal. We only need to tweak two things. First, we want to turn
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off human mode. We'll use a byte-level resolution. Then we'll pipe
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our output into `sort` using the appropriate column, which in this
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case is the eighth one.
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[source,sh]
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--------------------------------------------------
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% curl '192.168.56.10:9200/_cat/indices?bytes=b' | sort -rnk8
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green wiki2 3 0 10000 0 105274918 105274918
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green wiki1 3 0 10000 413 103776272 103776272
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green foo 1 0 227 0 2065131 2065131
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--------------------------------------------------
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// NOTCONSOLE
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If you want to change the <<time-units,time units>>, use `time` parameter.
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If you want to change the <<size-units,size units>>, use `size` parameter.
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If you want to change the <<byte-units,byte units>>, use `bytes` parameter.
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[float]
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=== Response as text, json, smile, yaml or cbor
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[source,sh]
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--------------------------------------------------
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% curl 'localhost:9200/_cat/indices?format=json&pretty'
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[
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{
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"pri.store.size": "650b",
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"health": "yellow",
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"status": "open",
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"index": "twitter",
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"pri": "5",
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"rep": "1",
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"docs.count": "0",
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"docs.deleted": "0",
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"store.size": "650b"
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}
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]
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--------------------------------------------------
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// NOTCONSOLE
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Currently supported formats (for the `?format=` parameter):
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- text (default)
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- json
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- smile
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- yaml
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- cbor
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Alternatively you can set the "Accept" HTTP header to the appropriate media format.
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All formats above are supported, the GET parameter takes precedence over the header.
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For example:
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[source,sh]
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--------------------------------------------------
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% curl '192.168.56.10:9200/_cat/indices?pretty' -H "Accept: application/json"
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[
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{
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"pri.store.size": "650b",
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"health": "yellow",
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"status": "open",
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"index": "twitter",
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"pri": "5",
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"rep": "1",
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"docs.count": "0",
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"docs.deleted": "0",
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"store.size": "650b"
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}
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]
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--------------------------------------------------
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// NOTCONSOLE
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[float]
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[[sort]]
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=== Sort
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Each of the commands accepts a query string parameter `s` which sorts the table by
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the columns specified as the parameter value. Columns are specified either by name or by
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alias, and are provided as a comma separated string. By default, sorting is done in
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ascending fashion. Appending `:desc` to a column will invert the ordering for
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that column. `:asc` is also accepted but exhibits the same behavior as the default sort order.
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For example, with a sort string `s=column1,column2:desc,column3`, the table will be
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sorted in ascending order by column1, in descending order by column2, and in ascending
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order by column3.
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[source,sh]
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--------------------------------------------------
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GET _cat/templates?v&s=order:desc,index_patterns
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--------------------------------------------------
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//CONSOLE
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returns:
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[source,txt]
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--------------------------------------------------
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name index_patterns order version
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pizza_pepperoni [*pepperoni*] 2
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sushi_california_roll [*avocado*] 1 1
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pizza_hawaiian [*pineapples*] 1
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--------------------------------------------------
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--
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include::cat/alias.asciidoc[]
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include::cat/allocation.asciidoc[]
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include::cat/count.asciidoc[]
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include::cat/fielddata.asciidoc[]
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include::cat/health.asciidoc[]
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include::cat/indices.asciidoc[]
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include::cat/master.asciidoc[]
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include::cat/nodeattrs.asciidoc[]
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include::cat/nodes.asciidoc[]
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include::cat/pending_tasks.asciidoc[]
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include::cat/plugins.asciidoc[]
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include::cat/recovery.asciidoc[]
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include::cat/repositories.asciidoc[]
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include::cat/thread_pool.asciidoc[]
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include::cat/shards.asciidoc[]
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include::cat/segments.asciidoc[]
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include::cat/snapshots.asciidoc[]
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include::cat/templates.asciidoc[]
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