kowshik commented on a change in pull request #10478:
URL: https://github.com/apache/kafka/pull/10478#discussion_r611450200



##########
File path: core/src/main/scala/kafka/log/Log.scala
##########
@@ -2586,11 +1999,15 @@ object Log {
             logDirFailureChannel: LogDirFailureChannel,
             lastShutdownClean: Boolean = true,
             topicId: Option[Uuid],
-            keepPartitionMetadataFile: Boolean): Log = {
+            keepPartitionMetadataFile: Boolean = true): Log = {
+    // create the log directory if it doesn't exist
+    Files.createDirectories(dir.toPath)
     val topicPartition = Log.parseTopicPartitionName(dir)
-    val producerStateManager = new ProducerStateManager(topicPartition, dir, 
maxProducerIdExpirationMs)
-    new Log(dir, config, logStartOffset, recoveryPoint, scheduler, 
brokerTopicStats, time, maxProducerIdExpirationMs,
-      producerIdExpirationCheckIntervalMs, topicPartition, 
producerStateManager, logDirFailureChannel, lastShutdownClean, topicId, 
keepPartitionMetadataFile)
+    val logLoader = new LogLoader(dir, topicPartition, config, scheduler, 
time, logDirFailureChannel)

Review comment:
       Great point. I tried this, but few problems I ran into were:
   1. A test tries to intercept the recovery logic by overriding `def 
recoverLog` in `LogLoader`. Ex: 
`LogLoaderTest.testLogRecoveryIsCalledUponBrokerCrash`.
   2. Some tests like to inject a custom `ProducerStateManager`, ex: 
`LogLoaderTest.testSkipTruncateAndReloadIfNewMessageFormatAndCleanShutdown`.
   3. Some tests like to inject a custom `LogSegments`, ex: `LogLoaderTest. 
testProducerSnapshotsRecoveryAfterUncleanShutdownCurrentMessageFormat`.
   
   I'm working on solving these issues, and will post a PR update soon.




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