[STORM-2418] add proper log message on metrics server fails/absent

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 0.10.0
• Component/s: storm-metrics, storm-opentsdb
• Environment: storm 0.10.0
• Assignee: Unassigned
• Reporter: Sree Vaddi
• Created: 16/Mar/17 03:02
• Updated: 16/Mar/17 03:02

Description

my metrics consumer writes to opentsdb server.
when this server went down, i see the following error message in my storm jobs.
which is very misleading.
create a ticket, so we can address this in future versions better.

2017-03-16 01:22:43.648 b.s.util [ERROR] Async loop died!
java.lang.RuntimeException: java.lang.ClassCastException: java.lang.Object cannot be cast to java.lang.Iterable
	at backtype.storm.utils.DisruptorQueue.consumeBatchToCursor(DisruptorQueue.java:135) ~[storm-core-0.10.0.jar:0.10.0]
	at backtype.storm.utils.DisruptorQueue.consumeBatchWhenAvailable(DisruptorQueue.java:106) ~[storm-core-0.10.0.jar:0.10.0]
	at backtype.storm.disruptor$consume_batch_when_available.invoke(disruptor.clj:80) ~[storm-core-0.10.0.jar:0.10.0]
	at backtype.storm.daemon.executor$fn__5694$fn__5707$fn__5758.invoke(executor.clj:819) ~[storm-core-0.10.0.jar:0.10.0]
	at backtype.storm.util$async_loop$fn__545.invoke(util.clj:479) [storm-core-0.10.0.jar:0.10.0]
	at clojure.lang.AFn.run(AFn.java:22) [clojure-1.6.0.jar:?]
	at java.lang.Thread.run(Thread.java:745) [?:1.8.0_45]
Caused by: java.lang.ClassCastException: java.lang.Object cannot be cast to java.lang.Iterable
	at backtype.storm.util$get_iterator.invoke(util.clj:929) ~[storm-core-0.10.0.jar:0.10.0]
	at backtype.storm.daemon.executor$mk_task_receiver$fn__5615.invoke(executor.clj:432) ~[storm-core-0.10.0.jar:0.10.0]
	at backtype.storm.disruptor$clojure_handler$reify__5189.onEvent(disruptor.clj:58) ~[storm-core-0.10.0.jar:0.10.0]
	at backtype.storm.utils.DisruptorQueue.consumeBatchToCursor(DisruptorQueue.java:127) ~[storm-core-0.10.0.jar:0.10.0]
	... 6 more