2013-08-28 19:24:34 -04:00
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[[cluster-health]]
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== Cluster Health
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The cluster health API allows to get a very simple status on the health
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of the cluster.
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[source,js]
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--------------------------------------------------
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$ curl -XGET 'http://localhost:9200/_cluster/health?pretty=true'
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{
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"cluster_name" : "testcluster",
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"status" : "green",
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"timed_out" : false,
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"number_of_nodes" : 2,
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"number_of_data_nodes" : 2,
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"active_primary_shards" : 5,
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"active_shards" : 10,
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"relocating_shards" : 0,
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"initializing_shards" : 0,
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"unassigned_shards" : 0
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}
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--------------------------------------------------
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The API can also be executed against one or more indices to get just the
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specified indices health:
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[source,js]
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--------------------------------------------------
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$ curl -XGET 'http://localhost:9200/_cluster/health/test1,test2'
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--------------------------------------------------
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The cluster health status is: `green`, `yellow` or `red`. On the shard
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level, a `red` status indicates that the specific shard is not allocated
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in the cluster, `yellow` means that the primary shard is allocated but
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replicas are not, and `green` means that all shards are allocated. The
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index level status is controlled by the worst shard status. The cluster
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status is controlled by the worst index status.
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One of the main benefits of the API is the ability to wait until the
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cluster reaches a certain high water-mark health level. For example, the
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2013-10-21 07:37:50 -04:00
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following will wait for 50 seconds for the cluster to reach the `yellow`
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level (if it reaches the `green` or `yellow` status before 50 seconds elapse,
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it will return at that point):
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2013-08-28 19:24:34 -04:00
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[source,js]
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--------------------------------------------------
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$ curl -XGET 'http://localhost:9200/_cluster/health?wait_for_status=yellow&timeout=50s'
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--------------------------------------------------
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[float]
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2013-09-25 12:17:40 -04:00
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[[request-params]]
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=== Request Parameters
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The cluster health API accepts the following request parameters:
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`level`::
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Can be one of `cluster`, `indices` or `shards`. Controls the
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details level of the health information returned. Defaults to `cluster`.
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`wait_for_status`::
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One of `green`, `yellow` or `red`. Will wait (until
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the timeout provided) until the status of the cluster changes to the one
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provided or better, i.e. `green` > `yellow` > `red`. By default, will not
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wait for any status.
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`wait_for_relocating_shards`::
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A number controlling to how many relocating
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shards to wait for. Usually will be `0` to indicate to wait till all
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relocations have happened. Defaults to not wait.
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`wait_for_nodes`::
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The request waits until the specified number `N` of
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nodes is available. It also accepts `>=N`, `<=N`, `>N` and `<N`.
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Alternatively, it is possible to use `ge(N)`, `le(N)`, `gt(N)` and
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`lt(N)` notation.
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`timeout`::
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A time based parameter controlling how long to wait if one of
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the wait_for_XXX are provided. Defaults to `30s`.
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The following is an example of getting the cluster health at the
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`shards` level:
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[source,js]
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--------------------------------------------------
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$ curl -XGET 'http://localhost:9200/_cluster/health/twitter?level=shards'
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--------------------------------------------------
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