Bence Kosztolnik created YARN-11874:
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Summary: ResourceManager REST api scheduler info contains
@xsi.type instead of type
Key: YARN-11874
URL: https://issues.apache.org/jira/browse/YARN-11874
Project: Hadoop YARN
Issue Type: Bug
Components: yarn
Affects Versions: 3.5.0
Reporter: Bence Kosztolnik
Assignee: Bence Kosztolnik
*Problem statement:*
The /ws/v1/cluster/scheduler returns with invalid response
{code:java}
{
"scheduler": {
"schedulerInfo": {
"@xsi.type":"fifoScheduler",
"capacity":1,
...
{code}
instead of this:
{code:java}
{
"scheduler": {
"schedulerInfo": {
"type":"fifoScheduler",
"capacity":1,
...
{code}
source:
https://hadoop.apache.org/docs/stable/hadoop-yarn/hadoop-yarn-site/ResourceManagerRest.html#Cluster_Scheduler_API
*Repro:*
1) Modify the TestRMWebServices#verifyClusterSchedulerFifo and add the line
{code:java}
assertTrue(info.has("type"), "incorrect type of element: " + info);
{code}
2) Run the testClusterSchedulerFifo test, it will fail
*Possible root cause:*
I think during the jersey2 upgrade when
*org.apache.hadoop.yarn.server.resourcemanager.webapp.JAXBContextResolver* was
modified with replacement of *com.sun.jersey.api.json.JSONJAXBContext* to
*org.glassfish.jersey.jettison.JettisonJaxbContext* we changed the
behaviourment how we convert the XML models to JSON in the REST API.
https://github.com/apache/hadoop/blob/06d36f5a6a1a01d159bef75b22ca2845e8c90bad/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/webapp/JAXBContextResolver.java#L158
*Other failures:*
When we generate a UI list with only one element it will be converted to json
object instead of list with single element.
For example the doc says
{noformat}
queues array of queues(JSON)/zero or more queue objects(XML)
{noformat}
in context of schedulerInfo object, but if we have just one queue it wont be an
array, just a simple queue object.
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