iit2009060 commented on code in PR #14482:
URL: https://github.com/apache/kafka/pull/14482#discussion_r1348438768


##########
core/src/test/scala/unit/kafka/log/remote/RemoteIndexCacheTest.scala:
##########
@@ -541,6 +541,126 @@ class RemoteIndexCacheTest {
     verifyFetchIndexInvocation(count = 1)
   }
 
+  @Test
+  def testOffsetIndexFileAlreadyExistOnDiskButNotInCache(): Unit ={
+    val remoteIndexCacheDir = new File(tpDir,RemoteIndexCache.DIR_NAME)
+    val tempSuffix = ".tmptest"
+    def getRemoteCacheIndexFileFromDisk(suffix: String) = {
+      Files.walk(remoteIndexCacheDir.toPath)
+        .filter(Files.isRegularFile(_))
+        .filter(path => path.getFileName.toString.endsWith(suffix))
+        .findAny()
+    }
+    def renameRemoteCacheIndexFileFromDisk(suffix: String) = {
+      Files.walk(remoteIndexCacheDir.toPath)
+        .filter(Files.isRegularFile(_))
+        .filter(path => path.getFileName.toString.endsWith(suffix))
+        .forEach(f => 
Files.move(f,f.resolveSibling(f.getFileName().toString().stripSuffix(tempSuffix))))
+    }
+    val entry = cache.getIndexEntry(rlsMetadata)
+    // copy files with temporary name
+    
Files.copy(entry.offsetIndex().file().toPath(),Paths.get(Utils.replaceSuffix(entry.offsetIndex().file().getPath(),"",tempSuffix)))
+    
Files.copy(entry.txnIndex().file().toPath(),Paths.get(Utils.replaceSuffix(entry.txnIndex().file().getPath(),"",tempSuffix)))
+    
Files.copy(entry.timeIndex().file().toPath(),Paths.get(Utils.replaceSuffix(entry.timeIndex().file().getPath(),"",tempSuffix)))
+
+    cache.internalCache().invalidate(rlsMetadata.remoteLogSegmentId().id())
+
+    // wait until entry is marked for deletion
+    TestUtils.waitUntilTrue(() => entry.isMarkedForCleanup,
+      "Failed to mark cache entry for cleanup after invalidation")
+    TestUtils.waitUntilTrue(() => entry.isCleanStarted,
+      "Failed to cleanup cache entry after invalidation")
+
+    // restore index files
+    renameRemoteCacheIndexFileFromDisk(tempSuffix)
+    // validate cache entry for the above key should be  null
+    
assertNull(cache.internalCache().getIfPresent(rlsMetadata.remoteLogSegmentId().id()))
+    cache.getIndexEntry(rlsMetadata)
+    // Index  Files already exist
+    // rsm should not be called again
+    // instead files exist on disk
+    // should be used
+    verifyFetchIndexInvocation(count = 1)

Review Comment:
   Hey @showuon  Thanks for identifying it , I missed it. 
   Changes Done. 



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