[GitHub] [kafka] ccding commented on a change in pull request #10763: KAFKA-12520: Ensure log loading does not truncate producer state unless required

[GitBox <gi...@apache.org>]

ccding commented on a change in pull request #10763:
URL: https://github.com/apache/kafka/pull/10763#discussion_r646971381



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File path: core/src/main/scala/kafka/log/LogLoader.scala
##########
@@ -368,12 +368,50 @@ object LogLoader extends Logging {
     for (swapFile <- swapFiles) {
       val logFile = new File(CoreUtils.replaceSuffix(swapFile.getPath, Log.SwapFileSuffix, ""))
       val baseOffset = Log.offsetFromFile(logFile)
+      // Check whether swap index files exist: if not, the cleaned files must exist due to the
+      // existence of swap log file. Therefore, we rename the cleaned files to swap files and continue.
+      var recoverable = true
+      val swapOffsetIndexFile = Log.offsetIndexFile(swapFile.getParentFile, baseOffset, Log.SwapFileSuffix)

Review comment:
       Is it possible to write something like the following in Scala?
   
   ```scala
   Vector(Log.offsetIndexFile, Log.timeIndexFile, Log.transactionIndexFile).foreach{
       fn => {
           swapIndexFile = fn(swapFile.getParentFile, baseOffset, Log.SwapFileSuffix)
           if (!swapIndexFile.exists()) {
               // ...
           }
           // other things
       }
   }
   ```




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