Github user mmiklavc commented on the issue:
https://github.com/apache/metron/pull/530
I'm seeing this error spinning up topologies in full-dev.
```
1:50.278 o.a.s.util [ERROR] Async loop died!
java.lang.RuntimeException: Grok parser Error: Grok parser unable to
initialize grok parser: Unable to load /patterns/yaf from either classpath or
HDFS
at org.apache.metron.parsers.grok.GrokParser.init(GrokParser.java:123)
~[stormjar.jar:?]
at
org.apache.metron.parsers.bolt.ParserBolt.prepare(ParserBolt.java:127)
~[stormjar.jar:?]
at
org.apache.storm.daemon.executor$fn__6573$fn__6586.invoke(executor.clj:798)
~[storm-core-1.0.1.2.5.6.0-40.jar:1.0.1.2.5.6.0-40]
at org.apache.storm.util$async_loop$fn__554.invoke(util.clj:482)
[storm-core-1.0.1.2.5.6.0-40.jar:1.0.1.2.5.6.0-40]
at clojure.lang.AFn.run(AFn.java:22) [clojure-1.7.0.jar:?]
at java.lang.Thread.run(Thread.java:745) [?:1.8.0_77]
Caused by: java.lang.RuntimeException: Grok parser unable to initialize
grok parser: Unable to load /patterns/yaf from either classpath or HDFS
at org.apache.metron.parsers.grok.GrokParser.init(GrokParser.java:107)
~[stormjar.jar:?]
... 5 more
```
I get this for both an existing parser, yaf in this case, as well as a
newly-created parser. Would any of this have changed in this PR?
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