Flink history server not showing running applications - apache-flink

Question

I am trying to configure flink history server. I have followed the flink document here. I am able to bring up the history server but could only see the completed jobs, not the running jobs. Am I missing something or is it just the completed jobs are displayed in the history server. Kindly help.
Jobs currently in cluster :
localhost:8081/joboverview
{
"running": [
{
"jid": "e4e6edb76b887054d7aca460b7136937",
"name": "Filter",
"state": "RUNNING",
"start-time": 1505971363801,
"end-time": -1,
"duration": 11588615,
"last-modification": 1505971363832,
"tasks": {
"total": 1,
"pending": 0,
"running": 1,
"finished": 0,
"canceling": 0,
"canceled": 0,
"failed": 0
}
}
],
"finished": [
{
"jid": "ec16f4cf01192268150c750966cefd0d",
"name": "Flink Java Job at Thu Sep 21 10:52:09 IST 2017",
"state": "FINISHED",
"start-time": 1505971329989,
"end-time": 1505971330746,
"duration": 757,
"last-modification": 1505971330746,
"tasks": {
"total": 3,
"pending": 0,
"running": 0,
"finished": 3,
"canceling": 0,
"canceled": 0,
"failed": 0
}
}
]
}
Jobs available in History Server
localhost:8082/joboverview
{
"running": [],
"finished": [
{
"jid": "ec16f4cf01192268150c750966cefd0d",
"name": "Flink Java Job at Thu Sep 21 10:52:09 IST 2017",
"state": "FINISHED",
"start-time": 1505971329989,
"end-time": 1505971330746,
"duration": 757,
"last-modification": 1505971330746,
"tasks": {
"total": 3,
"pending": 0,
"running": 0,
"finished": 3,
"canceling": 0,
"canceled": 0,
"failed": 0
}
}
]
}
Flink History server config :
#==============================================================================
# HistoryServer
#==============================================================================
# The HistoryServer is started and stopped via bin/historyserver.sh (start|stop)
# Directory to upload completed jobs to. Add this directory to the list of
# monitored directories of the HistoryServer as well (see below).
jobmanager.archive.fs.dir: hdfs://<hdfs>:8020/sax/flink/jobmanager
# The address under which the web-based HistoryServer listens.
historyserver.web.address: localhost
# The port under which the web-based HistoryServer listens.
historyserver.web.port: 8082
# Comma separated list of directories to monitor for completed jobs.
historyserver.archive.fs.dir: hdfs://<hdfs>:8020/sax/flink/jobmanager
# Interval in milliseconds for refreshing the monitored directories.
historyserver.archive.fs.refresh-interval: 10000

Answer 1

The very first line of the Flink website you linked states:
Flink has a history server that can be used to query the statistics of
completed jobs after the corresponding Flink cluster has been shut
down.
which also states that
The HistoryServer allows you to query the status and statistics of
completed jobs that have been archived by a JobManager.
Now from what I see, you also have access to the monitoring api which you accessed with "localhost:8081/joboverview", If you want to access only the running jobs you can access them with "/joboverview/running" uri
You can find more information at the Monitoring API link here.