Github user charlesporter commented on a diff in the pull request:
https://github.com/apache/nifi/pull/2411#discussion_r164561259
--- Diff:
nifi-nar-bundles/nifi-standard-bundle/nifi-standard-processors/src/main/java/org/apache/nifi/processors/standard/ExtractGrok.java
---
@@ -142,10 +194,11 @@
.description("FlowFiles are routed to this relationship when
no provided Grok Expression matches the content of the FlowFile")
.build();
+
private final static List<PropertyDescriptor> descriptors;
private final static Set<Relationship> relationships;
- private volatile Grok grok = new Grok();
+ private volatile List<Grok> grokList = new ArrayList<>();
--- End diff --
ok, i will create a new list. In practice, it is never modified while
running multi-threaded. but it is an easy and computationally cheap fix for
safer code.
---
