A service (such as HDFS, MapReduce, HBase) runs in a cluster. It has roles, which are the actual entities (NameNode, DataNodes, etc.) that perform the service's functions.
HDFS services and health checksIn CDH4, HDFS services may not present any health checks. This will happen if the service has more than one nameservice configured. In those cases, the health information will be available by fetching information about the nameservices instead.
The health summary is still available, and reflects a service-wide summary.
|name||name (string)||The name of the service.|
|type||type (string)||The type of the service, e.g. HDFS, MAPREDUCE, HBASE.|
|clusterRef||clusterRef (apiClusterRef)||Readonly. A reference to the enclosing cluster.|
|serviceState||serviceState (apiServiceState)||Readonly. The configured run state of this service. Whether it's running, etc.|
|healthSummary||healthSummary (apiHealthSummary)||Readonly. The high-level health status of this service.|
|configStale||configStale (boolean)||Readonly. Expresses whether the service configuration is stale.|
|healthChecks||array of healthChecks (apiHealthCheck)||Readonly. The list of health checks of this service.|
|serviceUrl||serviceUrl (string)||Readonly. Link into the Cloudera Manager web UI for this specific service.|