-----------------------------------------------------------
This is an automatically generated e-mail. To reply, visit:
https://reviews.apache.org/r/31686/
-----------------------------------------------------------
Review request for Ambari, Nate Cole and Tom Beerbower.
Bugs: AMBARI-9894
https://issues.apache.org/jira/browse/AMBARI-9894
Repository: ambari
Description
-------
After configuring a 3-node cluster with YARN and adding ResourceManager HA, the
some RM alerts are UNKNOWN.
The reason this fails is because YARN forwards requests for the standby RM to
the active one. In this scenario, the alert gets back an HTTP 200 response that
looks like:
```
This is standby RM. Redirecting to the current active RM:
http://c6403.ambari.apache.org:8088/
```
Unfortunately, this is a refresh header redirect which is not able to be
handled by the metric alert. The reason that the alerts work is that after the
VMs restarted, the original RM became active again.
There are a few issues here:
YARN doesn't do HA in the same way that other services like HDFS do. As a
result, there's no config property that could let the alert know what to do or
which hosts to contact.
YARN actually forwards after an HTTP 200 to the active node, which doesn't jive
with how alerts works.
The fix adds the new `high-availability` structure to the YARN URIs and adds a
new handler to urllib2 in order to follow a header-based redirect.
Diffs
-----
ambari-agent/src/main/python/ambari_agent/alerts/base_alert.py 3ae3c6d
ambari-agent/src/main/python/ambari_agent/alerts/metric_alert.py d378254
ambari-agent/src/test/python/ambari_agent/TestAlerts.py e9e106d
ambari-common/src/main/python/ambari_commons/urllib_handlers.py PRE-CREATION
ambari-server/src/main/resources/common-services/YARN/2.1.0.2.0/alerts.json
efef2d0
ambari-server/src/main/resources/common-services/YARN/2.1.0.2.0/package/alerts/alert_nodemanagers_summary.py
6895889
ambari-server/src/main/resources/stacks/BIGTOP/0.8/services/YARN/alerts.json
935fd1c
Diff: https://reviews.apache.org/r/31686/diff/
Testing
-------
Verified that the YARN HA alerts work properly.
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 12.530 s
[INFO] Finished at: 2015-03-03T10:43:54-05:00
[INFO] Final Memory: 8M/81M
Thanks,
Jonathan Hurley
