There is a combination of ZK and REST way to find the info you are looking for.
Use a zk client and do this - get /registry/users/<user_id>/services/org-apache-slider/<app_id> (with appropriate <user_id> and <app_id> of the koya cluster) >From the json dump look for element with api = "class >path:org.apache.slider.publisher.exports" under "external" element. Get the >value of "addresses"->"uri" e.g.: >http://c6401.ambari.apache.org:1025/ws/v1/slider/publisher/exports Then you can do - curl "http://c6401.ambari.apache.org:1025/ws/v1/slider/publisher/exports/<export_group_name>" e.g. curl "http://c6401.ambari.apache.org:1025/ws/v1/slider/publisher/exports/servers"; Does this help? Check https://issues.apache.org/jira/browse/SLIDER-151 and https://issues.apache.org/jira/browse/YARN-913 for few things to look out for, in the future. -Gour On 6/1/15, 5:47 AM, "Jean-Baptiste Note" <jbn...@gmail.com<mailto:jbn...@gmail.com>> wrote: Hi there, I've successfully exported some host/port dynamic combination in slider for Kafka on Yarn; they are made available under publisher/exports/servers on the appmaster (see https://github.com/jbnote/koya/). I'm now trying to access this information (really, service location) in two different ways: * From within slider. Is there a public API that I could use directly in python from other slider instances to get to this information ? -- this is necessary for spawning Kafka mirroring from slider, for instance. From what I can see in storm-slider, the slider binary is directly invoked. * From the rest of the world. I was thinking of exporting the data to DNS, and hoped to do this with a zookeeper-monitoring daemon, which is already partially implemented. However, none of my exported data seems to be present in ZK, which I was naively hoping for. Is there something i'm missing ? I find the ZK way perfect, rather than the REST API which as far as I can see will require polling. In python monitoring ZK is a breeze. Can someone familiar with the design intent shed some light on how I should carryout this ? Kind regards, JB
