chia7712 commented on code in PR #20707:
URL: https://github.com/apache/kafka/pull/20707#discussion_r3325487810


##########
metadata/src/main/java/org/apache/kafka/metadata/storage/Formatter.java:
##########
@@ -432,11 +449,10 @@ void doFormat(BootstrapMetadata bootstrapMetadata) throws 
Exception {
                     directoryTypes.get(writeLogDir).description(), writeLogDir,
                     MetadataVersion.FEATURE_NAME, releaseVersion);
                 Files.createDirectories(Paths.get(writeLogDir));
-                BootstrapDirectory bootstrapDirectory = new 
BootstrapDirectory(writeLogDir);
-                bootstrapDirectory.writeBinaryFile(bootstrapMetadata);
-                if 
(directoryTypes.get(writeLogDir).isDynamicMetadataDirectory()) {

Review Comment:
   Should we keep the `isDynamicMetadataDirectory()` condition here? I noticed 
that the E2E tests fail in combined mode with multiple log directories because 
the pure data folders end up containing the unexpected `__cluster_metadata-0` 
directory
   
   
https://github.com/apache/kafka/blob/6bfa19475d27808de524ac34d321bac387bd760a/core/src/main/scala/kafka/server/KafkaRaftServer.scala#L150



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