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From "Steve Blackmon (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (STREAMS-223) streams-monitoring exception when streamConfig not set
Date Fri, 14 Nov 2014 06:35:34 GMT

     [ https://issues.apache.org/jira/browse/STREAMS-223?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Steve Blackmon updated STREAMS-223:
-----------------------------------
    Priority: Minor  (was: Major)

> streams-monitoring exception when streamConfig not set
> ------------------------------------------------------
>
>                 Key: STREAMS-223
>                 URL: https://issues.apache.org/jira/browse/STREAMS-223
>             Project: Streams
>          Issue Type: Bug
>            Reporter: Steve Blackmon
>            Priority: Minor
>
> LocalStreamBuilder supports a default execution even when streamConfig is empty/null
> StreamBuilder builder = new LocalStreamBuilder(100);
> streams-monitoring throws an exception and does not run when no config is supplied.
> 00:31:21.762 [main] ERROR o.a.s.m.tasks.BroadcastMonitorThread - Exception while trying
to set default broadcast thread wait time: {}
> java.lang.NullPointerException: null
> 	at org.apache.streams.monitoring.tasks.BroadcastMonitorThread.setWaitTime(BroadcastMonitorThread.java:144)
[classes/:na]
> 	at org.apache.streams.monitoring.tasks.BroadcastMonitorThread.<init>(BroadcastMonitorThread.java:58)
[classes/:na]
> 	at org.apache.streams.local.builders.LocalStreamBuilder.<init>(LocalStreamBuilder.java:114)
[classes/:na]
> 	at org.apache.streams.local.builders.LocalStreamBuilder.<init>(LocalStreamBuilder.java:89)
[classes/:na]
> 	at org.apache.streams.twitter.example.TwitterUserstreamConsole.main(TwitterUserstreamConsole.java:49)
[classes/:na]
> 	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_20]
> 	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_20]
> 	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
~[na:1.8.0_20]
> 	at java.lang.reflect.Method.invoke(Method.java:483) ~[na:1.8.0_20]
> 	at com.intellij.rt.execution.application.AppMain.main(AppMain.java:134) [idea_rt.jar:na]
> 00:31:21.773 [main] DEBUG o.a.s.l.builders.LocalStreamBuilder - Attaching shutdown handler
> The workaround is to supply a config like this:
>         Map<String, Object> streamConfig = Maps.newHashMap();
>         streamConfig.put(LocalStreamBuilder.TIMEOUT_KEY, 20 * 60 * 1000);
>         streamConfig.put("monitoring_broadcast_interval_ms", -1);
>         StreamBuilder builder = new LocalStreamBuilder(100, streamConfig);
> But that should not be necessary.  
> Establish documented defaults for this capability, ensure no exceptions occur in the
default state, and do not require explicit action by the implementation to use the default.



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