showuon commented on a change in pull request #11006:
URL: https://github.com/apache/kafka/pull/11006#discussion_r666913262



##########
File path: core/src/main/scala/kafka/log/LogManager.scala
##########
@@ -312,7 +312,15 @@ class LogManager(logDirs: Seq[File],
       val logDirAbsolutePath = dir.getAbsolutePath
       var hadCleanShutdown: Boolean = false
       try {
-        val pool = Executors.newFixedThreadPool(numRecoveryThreadsPerDataDir)
+        val pool = Executors.newFixedThreadPool(numRecoveryThreadsPerDataDir, 
new ThreadFactory {
+          private val factory = Executors.defaultThreadFactory()
+          private val threadNumber = new AtomicInteger(1)
+          override def newThread(r: Runnable): Thread = {
+            val thread = factory.newThread(r)
+            thread.setName(s"log-recovery(${dir.getAbsolutePath}, 
${threadNumber.getAndIncrement()})")

Review comment:
       we can replace `dir.getAbsolutePath` with local variable 
`logDirAbsolutePath`

##########
File path: core/src/main/scala/kafka/log/LogManager.scala
##########
@@ -312,7 +312,15 @@ class LogManager(logDirs: Seq[File],
       val logDirAbsolutePath = dir.getAbsolutePath
       var hadCleanShutdown: Boolean = false
       try {
-        val pool = Executors.newFixedThreadPool(numRecoveryThreadsPerDataDir)
+        val pool = Executors.newFixedThreadPool(numRecoveryThreadsPerDataDir, 
new ThreadFactory {
+          private val factory = Executors.defaultThreadFactory()
+          private val threadNumber = new AtomicInteger(1)
+          override def newThread(r: Runnable): Thread = {
+            val thread = factory.newThread(r)
+            thread.setName(s"log-recovery(${dir.getAbsolutePath}, 
${threadNumber.getAndIncrement()})")

Review comment:
       nit: Do you think it is better to use dash (-) to concat path and 
threadNumber?
   s"log-recovery(${dir.getAbsolutePath}**-**${threadNumber.getAndIncrement()})"




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