klsince commented on a change in pull request #7301:
URL: https://github.com/apache/pinot/pull/7301#discussion_r690821255



##########
File path: 
pinot-segment-local/src/main/java/org/apache/pinot/segment/local/segment/store/SingleFileIndexDirectory.java
##########
@@ -329,47 +323,67 @@ private void persistIndexMap(IndexEntry entry)
       throws IOException {
     File mapFile = new File(_segmentDirectory, 
V1Constants.INDEX_MAP_FILE_NAME);
     try (PrintWriter writer = new PrintWriter(new BufferedWriter(new 
FileWriter(mapFile, true)))) {
-      String startKey = getKey(entry.key.name, entry.key.type.getIndexName(), 
true);
-
-      StringBuilder sb = new StringBuilder();
-      sb.append(startKey).append(" = ").append(entry.startOffset);
-      writer.println(sb.toString());
-
-      String endKey = getKey(entry.key.name, entry.key.type.getIndexName(), 
false);
-      sb = new StringBuilder();
-      sb.append(endKey).append(" = ").append(entry.size);
-      writer.println(sb.toString());
+      persistIndexMap(entry, writer);
     }
   }
 
-  private String getKey(String column, String indexName, boolean 
isStartOffset) {
-    return column + MAP_KEY_SEPARATOR + indexName + MAP_KEY_SEPARATOR + 
(isStartOffset ? "startOffset" : "size");
-  }
-
   private String allocationContext(IndexKey key) {
     return this.getClass().getSimpleName() + key.toString();
   }
 
+  /**
+   * This method sweeps the indices marked for removal. Exception is simply 
bubbled up w/o
+   * trying to recover disk states from failure. This method is expected to 
run during segment
+   * reloading, which has failure handling by creating a backup folder before 
doing reloading.
+   */
+  private void cleanupRemovedIndices()
+      throws IOException {
+    if (!_shouldCleanupRemovedIndices) {

Review comment:
       np




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