Github user joewitt commented on a diff in the pull request:

    https://github.com/apache/nifi/pull/1564#discussion_r104315947
  
    --- Diff: 
nifi-nar-bundles/nifi-standard-bundle/nifi-standard-processors/src/main/java/org/apache/nifi/processors/standard/ScanAttribute.java
 ---
    @@ -151,24 +182,41 @@ public void onScheduled(final ProcessContext context) 
throws IOException {
     
             this.dictionaryTerms = createDictionary(context);
             this.fileWatcher = new 
SynchronousFileWatcher(Paths.get(context.getProperty(DICTIONARY_FILE).getValue()),
 new LastModifiedMonitor(), 1000L);
    +
    +        this.dictionaryEntryMetadataDemarcator = 
context.getProperty(DICTIONARY_ENTRY_METADATA_DEMARCATOR).getValue();
         }
     
    -    private Set<String> createDictionary(final ProcessContext context) 
throws IOException {
    -        final Set<String> terms = new HashSet<>();
    +    private Map<String,String> createDictionary(final ProcessContext 
context) throws IOException {
    +        final Map<String,String> termsMeta = new HashMap<String, String>();
    +        this.dictionaryEntryMetadataDemarcator = 
context.getProperty(DICTIONARY_ENTRY_METADATA_DEMARCATOR).getValue();
    +
    +        String[] termMeta;
    +        String term;
    --- End diff --
    
    Consider moving lines 194 and 195 to line 207 (tightest scope possible) and 
marking their declarations as final since they're defined in an if/else.


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