The Hortonworks Community Connection is now live. A completely rebuilt Q&A forum, Knowledge Base, Code Hub and more, backed by the experts in the industry.

You will be redirected here in 10 seconds. If your are not redirected, click here to visit the new site.

The legacy Hortonworks Forum is now closed. You can view a read-only version of the former site by clicking here. The site will be taken offline on January 31,2016

Ambari Forum

host_status=UNHEALTHY, host_state=HEALTHY

  • #58017
    Hari Sekhon
    Participant

    Can anyone explain the difference between host_status and host_state in the Ambari API, the API docs don’t differentiate them with meaningful description and as you can see below they seem in conflict for one of my hosts:

    curl -u $AMBARI_USER:$AMBARI_PASSWORD ‘http://<fqdn>:8080/api/v1/clusters/PoC/hosts/<fqdn>?fields=Hosts/host_state,Hosts/host_status’
    {
    “href” : “http://<fqdn>:8080/api/v1/clusters/PoC/hosts/<fqdn>?fields=Hosts/host_state,Hosts/host_status”,
    “Hosts” : {
    “cluster_name” : “PoC”,
    “host_name” : “<fqdn>”,
    “host_state” : “HEALTHY”,
    “host_status” : “UNHEALTHY”

    }

  • Author
    Replies
  • #58136
    Yusaku Sako
    Moderator

    “host_state” represents the health of the host itself, independent of the components on the host. HEALTHY means that the host is heartbeating with the server. HEARTBEAT_LOST means the server has not been receiving heartbeats from the host.
    “host_status” represents the overall health of the host considering the status of the components on the host, such as “Master Down” (UNHEALTHY), “Slave Down” (ALERT).
    So, it is possible for a host to have host_status==UNHEALTHY and host_state==HEALTHY

    I’ve filed a JIRA [1] to improve the Ambari API documentation [2] for clarifications as the documentation is clearly lacking.

    [1] https://issues.apache.org/jira/browse/AMBARI-6687
    [2] https://github.com/apache/ambari/blob/trunk/ambari-server/docs/api/v1/index.md

The forum ‘Ambari’ is closed to new topics and replies.

Support from the Experts

A HDP Support Subscription connects you experts with deep experience running Apache Hadoop in production, at-scale on the most demanding workloads.

Enterprise Support »

Become HDP Certified

Real world training designed by the core architects of Hadoop. Scenario-based training courses are available in-classroom or online from anywhere in the world

Training »

Hortonworks Data Platform
The Hortonworks Data Platform is a 100% open source distribution of Apache Hadoop that is truly enterprise grade having been built, tested and hardened with enterprise rigor.
Get started with Sandbox
Hortonworks Sandbox is a self-contained virtual machine with Apache Hadoop pre-configured alongside a set of hands-on, step-by-step Hadoop tutorials.
Modern Data Architecture
Tackle the challenges of big data. Hadoop integrates with existing EDW, RDBMS and MPP systems to deliver lower cost, higher capacity infrastructure.