cmccabe commented on a change in pull request #11118:
URL: https://github.com/apache/kafka/pull/11118#discussion_r675850704



##########
File path: core/src/main/scala/kafka/log/Log.scala
##########
@@ -259,7 +259,7 @@ class Log(@volatile var logStartOffset: Long,
 
   import kafka.log.Log._
 
-  this.logIdent = s"[Log partition=$topicPartition, dir=$parentDir] "
+  this.logIdent = s"[Log partition=$topicPartition, 
dir=${parentDir}${topicId.map(id => s", topicId=$id").getOrElse("")}] "

Review comment:
       It seems like topicID will almost always be set to the empty string 
here, since _topicId is (often?) not initialized until these lines below:
   ```
     locally {
       initializePartitionMetadata()
       updateLogStartOffset(logStartOffset)
       maybeIncrementFirstUnstableOffset()
       initializeTopicId()
     }
   ```
   This might be better in a separate PR?




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