ccding commented on a change in pull request #10763:
URL: https://github.com/apache/kafka/pull/10763#discussion_r659094582



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File path: core/src/main/scala/kafka/log/LogLoader.scala
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@@ -106,7 +158,14 @@ object LogLoader extends Logging {
       loadSegmentFiles(params)
     })
 
-    completeSwapOperations(swapFiles, params)
+    // Forth pass: rename remaining index swap files. They must be left due to 
a broker crash when

Review comment:
       We have renamed all `.log.swap` files and their corresponding index swap 
files. If there is a single .index.swap file, it is not renamed previously in 
the recovery process. A single .index.swap file could happen if it crashed in 
the middle of this line: 
https://github.com/apache/kafka/blob/bd668e90c6992e7a1f23274aab37d186d6a4b560/core/src/main/scala/kafka/log/Log.scala#L2381




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