Github user mattf-horton commented on a diff in the pull request:
    --- Diff: 
    @@ -132,8 +130,9 @@ public void init() {
    -  public List<JSONObject> parse(byte[] rawMessage) {
    -    if (grok == null) {
    +  public List<JSONObject> parse(byte[] rawMessage, SensorParserConfig 
sensorParserConfig) {
    +    if (grok == null || isGrokPatternUpdated(sensorParserConfig) || 
isPatternLabelUpdated(sensorParserConfig)) {
    +      configure(sensorParserConfig.getParserConfig());
    --- End diff --
    Is the pattern timestampField reliable?  If so, comparing it would be much 
cheaper than comparing the whole grokPattern, which can be long, and 
additionally comparing the patternLabel would be unnecessary.  If not, a SHA1 
hash signature of the grokPattern+patternLabel could be added.  This comparison 
is being done on every message, so worth streamlining.

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